Duct Cleaning Dubai: Municipality IAQ Rules & Schedule

Dubai Municipality's Technical Guidelines for Indoor Air Quality (DM-HSD-GU119-IAQ, version 3, 2024) require HVAC systems to be maintained by competent persons to the manufacturer's schedule, with the building and its HVAC system inspected at least every three months; air handling unit fans and dampers cleaned at least every six months; cooling coils and condensate pipes cleaned at least every six months; condensate trays cleaned at least every month; filters cleaned or replaced so they never clog; airflow, temperature and humidity checked at least yearly and after renovations; and records kept of all maintenance. The guideline also calls for supply and return ducts to be accessible for inspection and cleaning, with smooth inner surfaces to reduce dust build-up. The Dubai Building Code requires approved filters, including in the return air upstream of coils, ducts built to SMACNA standards, and fire-rated duct linings.

Updated 17 October 2026. Every rule in this guide links to its official source at the end of the page.

Key facts

Inspections: building and HVAC system inspected at least every three months (DM-HSD-GU119-IAQ).
Every month: condensate trays cleaned at least monthly; unit ventilators may need monthly cleaning.
Every six months: air handling unit fans and dampers, cooling coils and condensate pipes cleaned.
Every year: airflow, temperature and humidity checked and adjusted, and after any renovation.
Design: supply and return ducts accessible for inspection and cleaning, with smooth, abrasion-resistant inner surfaces.
Filters: approved filters, including in return air upstream of coils (Dubai Building Code H.4.12.5).

Why ducts matter for indoor air in Dubai

In Dubai, buildings are air-conditioned for most of the year, so much of the indoor air passes through air handling units, fan coil units, filters and ducts. Dubai Municipality's indoor air quality guideline names the HVAC system as both a source and a pathway of indoor pollution: it lists microbiological growth in drip pans, humidifiers, ductwork and coils among contaminant sources, and describes the HVAC system as generally the predominant pathway and driving force for air movement in buildings. As guidance, fine desert dust, construction dust and moisture from condensation all add to build-up in Dubai's systems.

This guide focuses on the air side of the system: ducts, grilles, diffusers, air handling units and fan coil units. Power Zone's AC maintenance guide covers the cooling equipment itself, and the kitchen exhaust guide covers grease ducts in commercial kitchens, which follow separate rules.

Dubai Municipality's indoor air quality guideline

The Technical Guidelines for Indoor Air Quality for Healthy Life (DM-HSD-GU119-IAQ, version 3, issued 10 July 2024) aim to help building owners and operators provide good indoor air quality, which the guideline describes as air in occupied spaces with no known or expected contaminants at harmful concentrations, no conditions likely to cause health or comfort complaints, and air with which virtually no occupants express dissatisfaction. It covers design, construction, commissioning, operation and maintenance of buildings and their HVAC systems, investigation of complaints, parking ventilation, tobacco smoke and air cleaning devices. Power Zone's commercial building guide covers its pollutant limits and testing in more detail.

How HVAC systems become contaminated

Source	How it enters or grows (from DM-HSD-GU119-IAQ)
Dust and particles	Outdoor dust, sand and construction dust that pass or bypass filters and settle in ducts and on coils
Moisture	Condensation on coils and in drain pans; standing water promotes microbial growth
Microbial growth	Bacteria and mould in drip pans, humidifiers, ductwork and coils
Fibrous liners	Duct liners with fibrous or rough surfaces retain dirt and moisture and are hard to clean once mould grows into them
Re-entrained exhaust	Exhaust air re-entering intakes or leaking from poorly sealed exhaust ducts
Renovation	Dust and fumes from paint, adhesives and building work drawn into the system

The maintenance schedule the guideline sets

Section 9-4 of the guideline sets out maintenance duties for buildings and their HVAC systems:

Item	What DM-HSD-GU119-IAQ requires
Who	Competent persons employed specifically to ensure regular routine maintenance of the building and HVAC system, familiar with preventing hazards
Schedule basis	HVAC maintenance schedule in accordance with the manufacturer's recommendations
Every three months	Building and HVAC system inspected at least every three months, or as needed seasonally, for functions significant to indoor air quality
Every month	Condensate trays cleaned at least every month, based on condition; unit ventilators may need cleaning more often, such as monthly
Every six months	Air handling unit components such as fans and dampers cleaned at least every six months; cooling coils and condensate pipes cleaned at least every six months
Filters	Cleaned or replaced so they perform properly at all times and do not clog
Every year	System checked and adjusted for correct airflow, temperature and humidity after the first year and at least yearly, and after renovations or layout changes
Cleaning method	HVAC system and AHU room cleaned and maintained so that indoor air quality is not adversely affected by the work
Records	Records of all maintenance work: when and what was done

The guideline also suggests the preventive schedule include checking outdoor air intakes are shielded against wind-driven rain and sandstorms, measuring fresh air supply against design, and using seasonal checklists. Cooling towers are cleaned and treated under Dubai Municipality's separate Legionella guideline.

Condensate trays, coils and drain pans

The guideline gives special attention to the wet parts of the system. Cooling coils, condensate pipes and water trays should be checked regularly for sludge, algae, rust and leaks where water could enter the airstream; ferrous surfaces should be treated with anti-corrosion coating; and recirculating water treated so the treated water never enters the airstream. On design, it notes that drain pans need adequate drainage, with the drain hole flush with the bottom of the pan and the drain line mounted at the very bottom when the air handling unit sits in a mechanical room. Its investigation checklist asks whether drain pans are clean, properly drained and free of visible mould. As guidance, a blocked or standing drain pan is a direct route from dirty equipment to musty air, and is usually a simple fix.

Filters: what the rules require

Item	Rule
Approved filters	HVAC systems provided with approved air filters to the minimum recommended MERV in line with the ASHRAE HVAC Systems and Equipment handbook and Table E-1 of ASHRAE 52.2:2017 (Dubai Building Code H.4.12.5)
Return air	Filters also installed in the return air system, upstream of any heat exchanger or cooling coil
Filter standards	Media filters to UL 900, HEPA filters to UL 586, electrostatic filters to UL 867; filters in dwelling units designed for the application
Outdoor and recirculated air	Filtered for particulates; outdoor air filters protected from sprays and rain, with a good seal between filter and housing (DM-HSD-GU119-IAQ)
Efficiency check	The guideline's checklist asks whether primary filters are rated 10% to 30% dust-spot efficiency and secondary filters 40% to 85%, or the equivalent MERV, and whether filters are bypassed or overloaded
MERV	Minimum efficiency reporting value from 1 to 20 under ASHRAE testing; a higher MERV means higher filtration efficiency

The guideline warns that fitting HEPA filters to an existing HVAC system usually needs professional modification, because typical residential units and ducts cannot accommodate their size or airflow resistance and fans may lack capacity. As guidance, the right filter is the one the system was designed for, kept clean; an over-specified filter that chokes airflow can make comfort and air quality worse.

How ducts must be built: the Dubai Building Code

Item	What Dubai Building Code H.4.12 requires
Construction	Metallic ducts built to SMACNA HVAC duct construction standards; sizing to ASHRAE Fundamentals recommended velocity and pressure drop
Flexible ducts	Tested and classified to ANSI/UL 181, used only where air does not exceed 250°C or as vertical ducts serving no more than two adjacent storeys (UAE Fire and Life Safety Code Chapter 10)
Linings and insulation	Duct insulation, linings, adhesives, tapes and similar materials with a flame spread index of no more than 25 and smoke developed index of no more than 50 (ASTM E84 or UL 723)
Sealing	Ductwork effectively sealed to limit leakage, to ASHRAE 111 and SMACNA
Pressure testing	Ductwork above 250 Pa external static pressure, or in unconditioned spaces or exposed outdoors, pressure tested before occupancy by a specialised commissioning company approved by the Authority
Shafts	Shafts used as air ducts may not contain kitchen grease exhaust ducts, flammable vapour ducts, refuse chutes, combustible storage and other listed services
Plenums	Limited to specific spaces within one fire compartment, non-combustible, not used for smoke management, no fuel-fired appliances

The indoor air quality guideline adds the design rule most relevant to cleaning: supply and return ducts should be accessible for inspection and cleaning, components needing maintenance should be readily accessible and replaceable, and duct inner surfaces should be smooth and abrasion-resistant to reduce dust accumulation. As guidance, buildings without access doors in their ducts are harder and costlier to clean, and adding access panels during a renovation can make future cleaning easier.

Signs your ducts need attention

Musty or damp smells when the AC starts.
Dust blowing from grilles, or dirt marks or white dust on diffusers, which the guideline's checklist treats as a sign of particulates entering from the ventilation system.
Black marks around diffusers or on ceilings near grilles.
Allergy or breathing complaints that are worse indoors.
Weak airflow from some outlets despite the unit running.
Visible mould or water stains near fan coil units or ceiling voids.
Recent renovation, painting or construction nearby.
Ducts that have never been inspected.

How a duct inspection is done

As guidance, a useful inspection follows the air: outdoor air intakes and their shielding; filters and their seals; the air handling unit or fan coil unit, including fan, coil and drain pan; supply ducts, branch ducts and plenums through access doors or camera inspection; grilles and diffusers; and return paths. Photos or video at representative points show the actual condition, and a short report with recommendations lets the owner decide what to clean. The guideline's investigation checklist for complaints adds checks on fresh air quantities against ASHRAE 62, damper operation, minimum fresh air damper setting of about 15%, fan belts and motors, and short-circuiting between supply and exhaust outlets.

How ducts are cleaned

Stage	Typical method (guidance)
Preparation	Survey, isolate the system, protect occupied areas and furniture, open or install access points
Source removal	Mechanical agitation with brushes or air whips, with contaminants captured under negative pressure by vacuum collection equipment
Components	Grilles, diffusers and plenum boxes removed or cleaned in place; fan coil units, coils and drain pans cleaned
Air handling units	Fans, dampers, coils, drain trays and housings cleaned to the guideline's six-monthly and monthly intervals
Filters	Replaced or cleaned, with seals checked so air cannot bypass them
Verification	Before and after photos at the same points, and airflow checked where the system allows

As guidance, the guideline's requirement that cleaning and maintenance must not harm indoor air quality means dust must be captured, not blown into occupied rooms, and chemicals used only where needed and with ventilation.

Antimicrobial treatment and air cleaners

As guidance, antimicrobial treatment belongs after cleaning and only where there are signs of microbial growth or moisture problems; treatment on top of dirt does little. The guideline reviews air cleaning technologies: UV germicidal irradiation can destroy biological pollutants on coils, drain pans and ductwork but should be used with, not instead of, filtration; photocatalytic oxidation targets gases but not particles; and ozone generators are a lung irritant, have little effect at safe concentrations and can create harmful by-products, so it recommends contacting Dubai Municipality before using them. It also cautions that ion generators and electronic air cleaners may produce ozone.

After renovation or construction dust

The guideline treats renovation as a major indoor air quality risk: its checklists ask whether an area has been renovated, redecorated or newly furnished, and require the HVAC system to be checked and adjusted after renovations or layout changes that may affect air distribution. As guidance, ducts should be sealed or the system protected during dusty work, filters replaced after the work, and ducts inspected and cleaned before occupancy if dust got in. Power Zone's floor polishing guide covers dust control during grinding work.

Mold in ducts and duct liners

The guideline explains why fibrous or rough duct liners are a mould risk: accumulated dirt retains moisture and supplies nutrients, and mould structures that grow into fibrous materials are hard to remove. Dubai Municipality's mold guideline treats significant contamination of HVAC systems as its highest level, requiring professional remediation, with vents sealed during work and contaminated ductwork cleaned with the system sealed. Power Zone's mold removal guide explains that process.

Fresh air intakes and dampers

The guideline asks where fresh air intakes are located: whether they are blocked, near cooling towers, at street level or near car parks, since intakes below the third floor can draw in vehicle fumes, and whether heavy industry or construction is nearby. It asks whether fresh air controls and dampers work, whether the minimum fresh air damper opening is set at about 15%, and whether distribution dampers are clear of obstruction. Its design section calls for intakes located away from exhausts, vehicles and cooling towers, and for well-sealed exhaust ducts so exhaust cannot re-enter occupied spaces. As guidance, sand and dust storms make intake shielding and filter checks after storms part of good duct hygiene in Dubai.

Fan coil units in apartments and villas

As guidance, in many Dubai apartments and villas, air is handled by fan coil units in ceiling voids connected to short duct runs, grilles and diffusers. These units have filters, coils and drain trays that follow the same principles as large air handling units: filters cleaned regularly, drain trays kept clear and coils cleaned, as the guideline's monthly and six-monthly intervals indicate. Fan coil units and their ducts can be where musty smells in apartments start, because condensate and dust meet in a small, warm space. Access through ceiling hatches should be kept clear so units can be serviced.

Large buildings: AHUs, plant rooms and records

As guidance, office towers, hotels, malls and hospitals run central air handling units with long duct networks, so the guideline's three-monthly inspections, six-monthly component cleaning, monthly tray cleaning and yearly airflow checks become a structured programme. Facility managers should keep a register of units, filters and access points; a schedule mapped to the guideline's intervals; photo records of duct condition over time; and the maintenance records the guideline requires. When tenants complain about air quality, the guideline's investigation checklists provide a systematic way to find causes.

Car parks and exhaust systems

For enclosed car parks, the guideline and the Dubai Building Code require mechanical ventilation keeping carbon monoxide below 50 ppm, with at least six air changes per hour or demand-controlled ventilation, at least one CO sensor per 400 m², an alarm at 75 ppm in at least 5% of monitored locations, outdoor air to each level, positive pressure in connected occupied areas, and capacity for ten air changes per hour for smoke clearance. CO monitoring equipment must be checked and recalibrated every six months or per the manufacturer by a calibration company certified by Dubai Municipality, with results kept on site. As guidance, car park fans, ducts and jet fans also collect dust and need cleaning and inspection so they can deliver these air changes.

Commissioning and operating rules that affect ducts

Item	What DM-HSD-GU119-IAQ section 9-2 says
New building flush-out	Run HVAC at higher-than-normal ventilation before and during early occupancy to flush emissions from new materials, and delay occupancy until a reasonable flush-out is done
Coil moisture carryover	Avoid air velocities over coils high enough, for example from dirt build-up or poor design, to carry water droplets onto downstream surfaces
Filter condition	It should be possible to assess filter condition, pressure drop, contamination and installation at any time; minimum arrestance efficiency 60% for outdoor air and 80% for indoor air filters
Operating manual	A manual for each HVAC system with a schematic plan, operation, checks and their frequency, and remedies for defects, written with the maintenance staff
AHU rooms	Not used as passageways or storage; doors airtight where they open to contamination; inner surfaces easy to clean; enough space for cleaning and access
Air distribution	Efficient, effective and uniform, with no stagnant dead spaces
Cleaning products	Easily cleaned finishes, proper storage of cleaning materials, cleaning protocols in operation and maintenance documents, and ventilation during cleaning, painting and adhesive work

As guidance, the coil carryover point links directly to cleaning: dirty coils raise air velocity through the clean parts, which can throw water into ducts, where it wets dust and feeds microbial growth.

Testing the air, not just the ducts

For existing buildings, the guideline's Table 2 sets maximum limits for common indoor air pollutants, including carbon dioxide at 800 ppm averaged over 8 hours, PM2.5 at 35 µg/m³ and PM10 at 150 µg/m³ averaged over 24 hours, total bacterial counts of 1,000 CFU/m³ and total fungal counts of 500 CFU/m³. Testing must be carried out by an air testing company or laboratory accredited by EIAC, with compliant results submitted to Dubai Municipality, using calibrated equipment. As guidance, air testing before and after a major duct cleaning gives objective evidence of improvement, especially where occupants have complained, and high bacterial or fungal counts point to the HVAC system as a likely source.

Sick building complaints and the HVAC system

The guideline describes sick building syndrome as situations where occupants experience acute health and comfort effects, such as headache, eye, nose or throat irritation, dry cough, dry or itchy skin, dizziness, fatigue and sensitivity to odours, that appear linked to time in a building but without an identifiable illness or cause, with most people reporting relief soon after leaving. Causes may include multiple pollutants at low concentrations and other stressors. As guidance, when such complaints arise, the HVAC system is a natural first place to look: fresh air quantities, filters, drain pans, duct cleanliness and recent renovations are all on the guideline's investigation checklist.

Planning a building's duct hygiene programme

Register every air handling unit, fan coil unit, filter type and duct zone, with access points.
Baseline inspection of each zone with photos, noting condition and access problems.
Schedule to the guideline's intervals: monthly trays, three-monthly inspections, six-monthly coils, pipes, fans and dampers, yearly airflow checks, and filters as needed.
Clean by condition: ducts cleaned where inspection shows build-up, after renovations, or when complaints arise.
Verify with before and after photos and, where needed, accredited air testing.
Record everything, as the guideline requires, and review yearly.

Power Zone's Dubai property maintenance schedule shows how this fits with other building systems.

Common mistakes in duct cleaning

Mistake	Result
Fogging or spraying without cleaning	Dirt remains; chemicals settle on dirt and may irritate occupants
Blowing dust out of grilles into rooms	Dust spreads into living and working spaces
Cleaning ducts but not coils and trays	The main moisture and growth sites stay dirty
Ignoring filters and their seals	Unfiltered air bypasses filters and re-soils ducts quickly
Using ozone generators	Lung irritant with harmful by-products, as the guideline warns
No photos or records	No proof of work done and nothing to compare next time
Cleaning during dusty renovation	Ducts re-soil immediately; clean after the dusty work ends

Renovation rules in the guideline

Section 9-3 of the guideline sets rules for renovation that directly affect ducts. Major renovation should secure a satisfactory indoor environment; processes should be chosen for the lowest possible emissions, and polluting work should be encapsulated, given local extraction, exhausted directly outdoors or done when few people are exposed. In occupied buildings under partial renovation, the spaces being renovated should be effectively isolated from occupied zones, with supply air separated if necessary so occupants keep acceptable air, and pollutant concentrations kept within the guideline's limits. After major renovation that affects the HVAC system, such as new partitions or layout changes, the air distribution should be rebalanced. As guidance, that rebalancing is also the right moment to inspect and clean affected ducts and replace filters.

Sandstorms and dusty seasons

As guidance, sand and dust storms load filters quickly and can push fine dust past poorly sealed filters into ducts. The guideline's call to shield outdoor air intakes against wind-driven rain and sandstorms, and its requirement that filters never clog, point to a simple practice: check and replace filters after major storms, inspect intakes, and keep filter seals tight. Buildings near construction sites or open desert land face similar loads year-round and may need shorter filter intervals than the manufacturer's default.

Hotels, schools, clinics and offices

Building	Priorities (guidance)
Hotels	Many fan coil units in guest rooms; musty smells lead to guest complaints; schedule cleaning by floor with rooms taken out of use briefly
Schools and nurseries	Children are sensitive occupants; clean during holidays; check fresh air quantities for crowded classrooms
Clinics	Air quality matters for patients; follow any additional health authority requirements; document all work
Offices	Layout changes can affect air distribution; rebalance and clean after fit-outs, as the guideline requires
Restaurants	Kitchen grease exhaust is separate and covered by its own rules; dining-area ducts and fan coil units still follow the IAQ guideline

Empty properties and holiday homes

As guidance, a property left with its AC off in humid months can develop musty smells in fan coil units and ducts, because condensate and dust sit without airflow. Before reoccupying, running the system with fresh filters, checking drain trays and smelling the air at each grille helps decide whether cleaning is needed. Holiday homes benefit from a quick check of filters and drain trays between longer stays, which follows the guideline's monthly tray and regular filter intervals.

Types of ducts and what they mean for cleaning

Duct type	Cleaning considerations (guidance)
Galvanised sheet metal	Most common for main runs; can be cleaned mechanically through access doors
Internally lined ducts	Acoustic or thermal lining inside; fibrous liners are a mould risk and need gentle methods; damaged lining may need replacement
Flexible ducts	Short connections to grilles; easily damaged by aggressive brushing; badly soiled sections may be replaced rather than cleaned
Plenums and ceiling voids	Used as return air paths in some buildings; dust in voids can enter the return air

The Dubai Building Code's requirements for flexible ducts and fire-rated linings also apply to any replacement sections.

Smoking areas and separate ventilation

The guideline notes that smoking is strictly prohibited in public places under Local Order No. 11 of 2003, including shopping centres, hotels, restaurants, government buildings, healthcare facilities, commercial buildings, common accommodation and coffee shops, except where permitted under Dubai Municipality's manual for regulating smoking in public places. Its investigation checklist asks whether smoking is restricted to designated areas with an independent ventilation system. As guidance, ducts that have carried tobacco smoke accumulate sticky residues and odours that ordinary dust cleaning does not remove, which is one reason the rules keep smoking areas on separate systems.

In-duct and portable air cleaners

The guideline explains that air cleaners can be installed in the ductwork of HVAC systems or used as portable units, and that their effectiveness depends on their ability to remove pollutants from the space. Mechanical filters in ducts capture larger particles such as dust, pollen, dust mite and cockroach allergens, some moulds and animal dander, but these particles settle quickly, so filters do not remove them completely from rooms. Sorbent media filters, most commonly activated carbon, capture many gaseous pollutants. Plasma air cleaners can remove some gases and particles and deactivate microorganisms but may form harmful by-products. As guidance, no air cleaner replaces clean ducts, coils and filters: it works best on top of a well-maintained system.

Electrostatic devices and fire safety

The guideline's checklist asks whether electrostatic precipitators are an approved type from the fire services, and the Dubai Building Code requires electrostatic air filters to conform to UL 867. As guidance, any device added to a duct, from UV lamps to electrostatic cells, changes the system and should be selected for compatibility with its airflow, fire safety requirements and maintenance access, and cleaned on its own schedule.

Records to keep

The register of air handling units, fan coil units, filters and access points.
Maintenance records of what was done and when, as the guideline requires.
Inspection photos and reports, before and after cleaning.
Filter change dates and types, and pressure drop readings where available.
Airflow and balancing reports after the first year, yearly, and after renovations.
Accredited air test results and submissions to Dubai Municipality where required.
For car parks, CO sensor calibration certificates kept on site.

Handling occupant complaints

As guidance, when someone complains about stuffy air, smells or symptoms, record who, where, when and what they notice, and whether it improves away from the building, then check the HVAC basics for that zone: filter, drain tray, coil, grille condition, fresh air setting and any recent work nearby. The guideline's walkthrough checklist and occupant interview appendix are designed for exactly this kind of investigation, and acting on complaints early can stop a local problem from becoming a building-wide one.

Duct cleaning and energy use

As guidance, the biggest energy effects of dirty air systems come from clogged filters and fouled coils, which restrict airflow and make fans and compressors work harder; ducts themselves matter mainly when heavily soiled or blocked. That is why the guideline's maintenance list puts filters, coils and drain trays on short intervals, and why a duct cleaning job is worth most when it includes those components. Power Zone's AC maintenance guide covers DEWA's advice on AC efficiency.

A simple monthly check for homes

Clean or replace AC filters as the manufacturer recommends, more often after dust storms.
Look at grilles and diffusers for dust, black marks or condensation.
Smell the air when the AC starts; mustiness points to trays, coils or ducts.
Check for water marks on ceilings near fan coil units.
Keep ceiling access hatches clear so units can be serviced.
Book a professional inspection if any of these persist.

Questions to ask a duct cleaning company

Will you inspect first and show photos of the condition before recommending cleaning?
How will you capture dust: what negative-pressure vacuum equipment and access points will you use?
Will you clean coils, drain pans, fans and dampers, not only ducts and grilles?
When and where will antimicrobial treatment be used, which product, and with what ventilation?
How will you protect occupants, furniture and finishes during the work?
Will you provide before and after photos at the same points and a written report for the maintenance records?

Who is responsible

Situation	Responsible party
Jointly owned buildings	Owners association through its Management Entity for central systems and common parts under Law No. 6 of 2019, which lists air conditioning systems, ventilation fans and ducts among common parts
Rented homes	The landlord under Article 16 of Law No. 26 of 2007 for maintenance and repairing defects, unless the lease says otherwise
Commercial buildings	The owner or operator, through competent maintenance personnel, under the indoor air quality guideline

Dubai prices for related AC work

Indicative starting prices from Power Zone's official Dubai rate card, in AED and excluding 5% VAT; duct cleaning itself is quoted after an inspection, based on the number of units, grilles and length of ductwork, access and contamination:

Service	Unit	Starting price
AC filter cleaning	per unit	from AED 60
FCU cleaning	per unit	from AED 250
Package / ducted unit service	per unit	from AED 300

See the full Power Zone Dubai rate card.

Duct cleaning with Power Zone

Power Zone provides duct cleaning and antimicrobial treatment in Dubai, part of all seven emirates, 20 in-house teams: inspection of ducts, grilles, diffusers and fan coil units; mechanical cleaning and vacuum extraction of ducts; cleaning of grilles, diffusers and plenum boxes; fan coil unit, coil and drain pan cleaning; antimicrobial treatment where needed, after cleaning; and before and after photo documentation. See also AC maintenance, mold removal and Power Zone Dubai, or request a site survey.

Frequently asked questions

How often should AC ducts be cleaned in Dubai?

Dubai Municipality's guideline sets inspection of the building and HVAC system at least every three months, with cleaning based on condition; AHU fans, dampers, coils and condensate pipes at least every six months.

How often must condensate trays be cleaned?

At least every month, based on condition, under DM-HSD-GU119-IAQ.

Who should maintain HVAC systems in Dubai buildings?

Competent persons employed specifically for routine maintenance of the building and HVAC system, following the manufacturer's schedule.

Must AC filters be in the return air?

Yes. The Dubai Building Code requires filters in the return air system upstream of any heat exchanger or cooling coil.

What does MERV mean?

Minimum efficiency reporting value, a filter rating from 1 to 20 under ASHRAE testing; a higher MERV means higher filtration efficiency.

Can I fit a HEPA filter to my home AC?

The guideline warns it would probably need professional modification, because typical units and ducts cannot accommodate HEPA filters' size or airflow resistance.

What are signs that ducts need cleaning?

Musty smells when the AC starts, dust or white marks on diffusers, black marks around grilles, weak airflow and indoor allergy complaints.

Are ozone generators safe for duct cleaning?

Dubai Municipality's guideline says ozone is a lung irritant with little effect at safe levels and recommends contacting the municipality before using ozone generators.

Is antimicrobial treatment needed after duct cleaning?

As guidance, only where there are signs of microbial growth or moisture, and only after cleaning.

Do ducts need access doors for cleaning?

The guideline says supply and return ducts should be accessible for inspection and cleaning, with smooth inner surfaces.

How often must HVAC airflow be checked?

After the first year and at least yearly, and after renovations or layout changes, under the guideline.

Why do fibrous duct liners grow mould?

Dirt on fibrous or rough surfaces retains moisture and nutrients, and mould that grows into fibres is hard to remove, the guideline explains.

What standard must ducts be built to in Dubai?

Metallic ducts to SMACNA HVAC duct construction standards, with linings meeting flame spread 25 and smoke developed 50 limits.

What CO level is allowed in Dubai car parks?

Below 50 ppm, with alarms at 75 ppm in at least 5% of monitored locations and at least one sensor per 400 m².

Who pays for duct cleaning in a rented flat?

The landlord is responsible for maintenance under Article 16 of Law No. 26 of 2007, unless the lease says otherwise.

How much does FCU cleaning cost in Dubai?

Power Zone's rate card lists FCU cleaning from AED 250 per unit and AC filter cleaning from AED 60, excluding VAT.

What fungal count is allowed indoors in Dubai?

The guideline's Table 2 sets total fungal counts at 500 CFU/m³ and total bacterial counts at 1,000 CFU/m³ for existing buildings.

Who can test indoor air in Dubai?

An air testing company or laboratory accredited by EIAC, with compliant results submitted to Dubai Municipality.

Can AHU rooms be used for storage?

No. The guideline says rooms with air handling units should not be used as passageways or for storage.

What filter efficiency does the guideline expect?

Minimum arrestance efficiency of 60% for outdoor air filters and 80% for indoor air filters, with filter condition assessable at any time.

Must air distribution be rebalanced after an office fit-out?

Yes. The guideline requires rebalancing after major renovation affecting the HVAC system, such as new partitions or layout changes.

Should filters be changed after a sandstorm?

As guidance, check and replace them after major storms; the guideline requires filters that never clog and intakes shielded against sandstorms.

Do air purifiers replace duct cleaning?

As guidance, no. The guideline notes filters cannot fully remove settled particles; air cleaners work best on top of clean ducts, coils and filters.

Must smoking areas have separate ventilation?

The guideline's checklist asks whether smoking is restricted to designated areas with an independent ventilation system.

Does duct cleaning lower my DEWA bill?

As guidance, the largest gains come from clean filters and coils, which restore airflow; ducts matter most when heavily soiled.

What can I check myself each month?

As guidance: filters, grilles and diffusers, musty smells at start-up, water marks near fan coil units and clear access hatches.

Must ductwork be pressure tested in Dubai?

Ductwork above 250 Pa external static pressure, or in unconditioned spaces or outdoors, must be pressure tested before occupancy by an Authority-approved commissioning specialist.

What flame spread rating must duct linings meet?

A maximum flame spread index of 25 and smoke developed index of 50, under the UAE Fire and Life Safety Code as cited in the Dubai Building Code.

Should a new building be flushed before occupancy?

Yes. The guideline recommends running HVAC at higher ventilation to flush emissions from new materials before and during early occupancy.

Are plenums allowed to be used for smoke control?

No. The Dubai Building Code says plenums shall not be used as part of a smoke management system and must be non-combustible within one fire compartment.

What carbon dioxide level indicates poor ventilation indoors?

The guideline's limit for existing buildings is 800 ppm averaged over 8 hours, alongside its other pollutant limits.

Does Power Zone clean ducts in Dubai?

Yes. Power Zone inspects and cleans ducts, grilles, diffusers and fan coil units, applies antimicrobial treatment only where needed, and documents before and after.

Duct cleaning in Dubai: indoor air quality rules, schedules and methods