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Exhaust Fan Guide

KDK Ventilating Fan Singapore: Full Model & Sizing Guide

KDK dominates Singapore bathroom ventilation because its motors last 8–12 years in tropical humidity. But the wrong model in the wrong bathroom is the #1 cause of recurring ceiling mould. Here's every KDK fan sold locally.

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Quick Answer

KDK dominates Singapore bathroom ventilation because its motors last 8–12 years in tropical humidity. For a standard HDB toilet the 20WHCT ceiling model is the default; larger or master bathrooms need the 24CDHR or an inline unit, and humidistat models suit bathrooms used by several people. Choose by CFM against your floor area — the wrong model in the wrong bathroom is the main cause of recurring ceiling mould. Installation is from S$380 all-in.

Based on: HVAC Mould Prevention Study Pico X Health Case Studies

  1. KDK 20WHCT — the default HDB toilet fan

    200mm sail, ~93 m³/h. Fits most HDB toilet cut-outs. Quiet (~32 dB), 5-year motor. Best for 3–4 m² HDB toilets.

  2. KDK 24CDHR — larger master-bath ceiling fan

    240mm sail, ~135 m³/h. Upgrade when 20WHCT keeps steam on ceiling >15 min after hot shower.

  3. KDK 15WUA / 15WAA — window / wall mount fans

    150mm blade, ~180 m³/h. Used when no ceiling duct (older shophouses).

  4. KDK 25TGQ / 32CHH — inline / cabinet ceiling fans

    Silent inline, ~200 m³/h, ~28 dB. Gold standard for master en-suites.

  5. KDK 30AUH — kitchen / heavy duty ceiling fan

    Bigger blade, higher static pressure. Only if a pro confirms 20WHCT can't cope.

  6. KDK 24JBAR — with humidistat + timer

    Same body as 24CDHR + built-in humidistat and 30-min run-on. Set-and-forget pick.

  7. The sizing rule

    Floor area (m²) × 25 = min airflow (m³/h). 4 m² HDB toilet → 100 m³/h.

Ready to fix your fan?

Bathroom fan replacement from S$380 all-in — KDK unit + install + electrical reconnect + 1-year warranty. Bundle with mould treatment Essential from $199 (reg. $299).

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Frequently Asked Questions

Which KDK fan is best for HDB bathrooms?
20WHCT for 3–4 m² HDB toilets; 24CDHR for master baths ≥ 5 m²; 24JBAR if nobody remembers the fan.
How long does a KDK fan last in Singapore?
8–12 years typical home use. Coastal HDB units see 6–8 years.
Do KDK fans have a humidistat built in?
Only 24JBAR and some inline models. Add a wall humidistat (S$40–80) for the others.
How much does a KDK install cost?
From S$380 all-in for like-for-like 20WHCT/24CDHR. Inline from S$550.