A puff of dust when the FCU starts after a vacant month is common. A daily grey film on the table after you already dusted is duct or lining dirt, or a return sucking from a dirty ceiling void.
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Problem
Dust coming from AC vents
A puff of dust when the FCU starts after a vacant month is common. A daily grey film on the table after you already dusted is duct or lining dirt, or a return sucking from a dirty ceiling void.
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Causes
- Ducts full of desert and plaster dust
- Missing filter on the FCU
- Torn return so the unit eats ceiling void dust
- Construction next door
- Mould debris (darker, often with smell)
What you can safely check
- Open the FCU hatch if you have one and look at the filter.
- Wipe the grille — if it returns in a day, it is upstream.
- Do not keep running on high hoping to ‘blow it out’ onto the sofa.
When to get a technician
Daily dust, post-renovation grit, or dark debris with a smell.
Camera inspection is for disputes. Cleaning is for when you already know the ducts are filthy. Studio-to-villa prices are on the duct cleaning page.
Related: AC Duct Cleaning from AED 400 in Dubai, Abu Dhabi & Al Ain.
FAQs
Will a HEPA room purifier fix ducts?
It will catch some dust after it has already blown into the room. It will not clean the duct.