Exhaust Fan Guide
How to Clean a KDK Ventilation Fan — Step-by-Step
A dirty KDK fan loses 30–40% of its airflow — enough to turn a mould-free bathroom back into a mould problem within a month. Here's the safe 20-minute clean.
Quick Answer
Cleaning a KDK ventilation fan takes about 20 minutes: switch off at the mains, unclip the grille, wash it with mild detergent, vacuum the impeller and housing, wipe the blades with a barely damp cloth, and let everything dry fully before reassembly. Do not spray water or cleaner into the motor housing and do not twist the humidistat dial. A dirty KDK loses 30–40% of its airflow, which is enough to bring bathroom ceiling mould back within a month.
Turn off the fan at the wall switch AND the DB
Wall switch cuts fan. MCB at consumer unit cuts wiring. Test with non-contact voltage tester.
Remove the plastic bezel/cover
Two spring clips. Squeeze inward — don't yank.
Vacuum the blade & housing
Brush nozzle. Dust here sheds 30–40% of airflow.
Wipe the blade with a damp microfibre
Diluted dish soap on microfibre. Don't spray liquid into motor housing.
Scrub and rinse the bezel
Soft brush + rinse. Dry fully before reinstall.
Check the flap / backdraft damper
Small plastic flap in the duct. Stuck open = humid shaft air enters bathroom 24/7.
Reinstall, restore power, test
Reseat bezel until both clips snap. Fan should start within 1 second.
Ready to fix your fan?
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Frequently Asked Questions
- How often should I clean a KDK bathroom fan?
- Every 6 months in normal HDB toilet; every 3 months if heavy hot-shower use.
- Can I clean the fan live?
- No. Cut wall switch AND MCB. Test with non-contact voltage tester.
- The blade came off in my hand — is that normal?
- No — shaft is worn. Don't reinstall; replace (S$380 all-in).
- Do I need to clean the ducting behind the fan?
- Every 3–5 years. If humidity persists after clean, duct is the next suspect.
- Fan is 10 years old — clean or replace?
- Replace. Cleaning buys 6–12 months at best. New KDK 20WHCT + install S$380.
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