Oh does my bathroom exhaust fans count?
Rental, this was AFTER they'd been "professionally cleaned"
They used an air compressor and WD40, so the dust built right back up and turned into sticky sludge
This is after I'd used my own air compressor to blow out what i could, immediately after removing the cover to see what was left
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And they mounted it sideways, so it was 'exhausting' straight into insulation floof - it literally WASN'T exhausting
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I had to use a ladder and remove it myself (dangerous as all fuck, i've got issues with my back and legs so i'm wobblier than hospital food jelly)
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My son was having asthma issues, realised its when the fan was turned off, dust was coming back down - and once it came down WET, I investigated and fixed it all myself