Updated for 2026 — Written by the Home Genie team, Singapore’s home appliance specialists with over 40 years of industry experience.
If you’ve ever stir-fried sambal belacan and had the smell linger in your living room for two days, you already know why kitchen ventilation matters. Singapore’s cooking culture — heavy wok frying, curries, and high-heat cooking — generates more smoke, grease, and odour than the typical Western kitchen. Getting ventilation right prevents everything from greasy walls to smoke-triggered fire alarms.
The Kitchen Ventilation System: How It Works
Good kitchen ventilation requires two things working together:
- Extraction (removing bad air): A range hood above the stove captures smoke and grease at the source, while a wall or ceiling exhaust fan removes heat and odour from the general kitchen area
- Makeup air (replacing with fresh air): Fresh air enters through windows, door gaps, or a separate intake vent to replace the extracted air
Most HDB kitchens have a range hood and a window — but many lack a proper exhaust fan for general ventilation. The range hood only captures smoke directly above the stove. An exhaust fan handles the ambient heat, steam, and lingering odours that the range hood misses.
Types of Kitchen Exhaust Fans
| Type | Description | Best For | Airflow |
|---|---|---|---|
| Wall-mounted exhaust fan | Installed through an external wall, pulls air directly outside | HDB kitchens with external wall access | 200–500 m³/h |
| Window-mounted exhaust fan | Fits into a window opening (replacing glass panel) | Kitchens with louvre or casement windows | 150–400 m³/h |
| Ceiling-mounted duct fan | Mounted in false ceiling, ducts to external vent | Enclosed kitchens with false ceilings | 200–600 m³/h |
| Inline duct fan | Installed within ducting, pulls air from a ceiling grille | Long duct runs, commercial kitchens | 300–1000 m³/h |
Sizing Your Kitchen Exhaust Fan
Kitchen exhaust fans need more airflow capacity than bathroom fans because cooking generates significantly more heat, moisture, and airborne particles. The standard recommendation:
Kitchen exhaust should achieve 10–15 air changes per hour
| Kitchen Size | Volume (approx.) | Recommended Airflow | Model Suggestion |
|---|---|---|---|
| Small HDB kitchen (40–60 sq ft) | 320–480 cu ft | 250–400 m³/h | KDK 25RGF (10") |
| Standard HDB kitchen (60–80 sq ft) | 480–640 cu ft | 400–550 m³/h | KDK 30RHF (12") |
| Large / open kitchen (80–120 sq ft) | 640–960 cu ft | 550–800 m³/h | KDK 30RHF or dual fan setup |
| Condo dry + wet kitchen | Varies widely | 600+ m³/h | Inline duct fan + wall fan |
Important: These are in addition to your range hood. The range hood and exhaust fan serve different purposes — the hood captures smoke at the stove, while the exhaust fan handles the general kitchen atmosphere.
Our Top Kitchen Exhaust Fan Picks
1. KDK 30RHF (12") — Best for Standard HDB Kitchens
The 30RHF is the gold standard for HDB kitchen ventilation. The 12" blade moves a serious volume of air — you can feel the difference within minutes of turning it on. The metal construction handles kitchen heat and grease better than plastic models. Includes a built-in shutter that closes when the fan is off, preventing insects and corridor smells from entering.
Price: $80–$130 | Airflow: ~500 m³/h | Best for: Standard to large HDB kitchens
2. KDK 25RGF (10") — Best for Compact Kitchens
If your kitchen is on the smaller side or you’re adding a supplementary fan to complement an existing range hood, the 10" model provides adequate airflow without being oversized. Same reliable KDK motor and metal build as the larger model.
Price: $60–$100 | Airflow: ~350 m³/h | Best for: Small kitchens, secondary ventilation
3. KDK 20RLF (8") — Budget-Friendly Option
An 8" fan for kitchens where space is tight or where you’re adding a fan to a kitchen that already has strong range hood extraction. Does the job for light cooking.
Price: $50–$80 | Airflow: ~250 m³/h | Best for: Light cooking, supplementary ventilation
Open-Concept Kitchen: The Ventilation Challenge
Open-concept kitchens are increasingly popular in Singapore renovations, but they create a ventilation headache. Without walls to contain cooking fumes, smoke and odours spread directly into the living and dining areas.
If you have or are planning an open kitchen, here’s what we recommend:
- Invest in a powerful range hood (>800 m³/h) — This is your primary defence. A weak hood in an open kitchen means your living room sofa will smell like dinner.
- Add a supplementary exhaust fan — Even with a good range hood, a wall exhaust fan near the kitchen window creates cross-ventilation that clears residual odours faster.
- Consider a glass partition — A half-wall or sliding glass panel between the cooking zone and living area can be opened when not cooking and closed during heavy frying. This is a popular renovation solution in Singapore.
- Run the fan for 10–15 minutes after cooking — Most of the odour removal happens after you finish cooking. Don’t switch off immediately.
Range Hood vs Exhaust Fan: Do You Need Both?
Short answer: yes, ideally. Here’s why they’re complementary:
| Function | Range Hood | Exhaust Fan |
|---|---|---|
| Captures stove smoke & grease | Yes — this is its primary job | No — too far from the stove |
| Removes ambient heat | Partially | Yes — moves general room air |
| Clears lingering odours | Limited — mainly catches airborne particles | Yes — exchanges room air with outside air |
| Creates cross-ventilation | No | Yes — pulls air through the kitchen space |
In a typical HDB kitchen, the range hood handles the intense frying smoke while the exhaust fan handles the general heat and post-cooking odours. Together, they keep the kitchen fresh and prevent grease build-up on walls and cabinets.
Maintenance Tips
Kitchen exhaust fans accumulate grease faster than bathroom fans. Regular cleaning keeps them efficient and extends their lifespan:
- Clean the grille and blades every 3 months — Remove the front cover and wipe blades with a degreaser. Kitchen grease reduces blade efficiency significantly.
- Check the shutter mechanism — Grease can cause the auto-shutters to stick open or closed. A stuck-open shutter lets insects in; a stuck-closed shutter blocks airflow.
- Inspect the duct annually — For ceiling-mounted fans, grease accumulation in the duct can reduce airflow by 30–50% over time. Professional duct cleaning is recommended every 2–3 years.
- Replace every 8–12 years — Kitchen exhaust fans work harder than bathroom fans and are exposed to grease and heat. Even reliable KDK motors benefit from replacement after a decade of kitchen duty.
Common Kitchen Ventilation Mistakes
- Relying only on the range hood — A range hood alone can’t ventilate the entire kitchen. The ambient heat and odours need a separate exhaust path.
- Undersizing the exhaust fan — A 6" fan in a kitchen is decorative at best. Kitchen fans should be 10"–12" minimum for any meaningful airflow.
- Blocking the makeup air path — If you seal every window and door gap for aircon efficiency, your exhaust fan has no air to pull. Leave a gap under the kitchen door or install a transfer grille.
- Mounting the fan too far from the cooking zone — The closer the exhaust fan is to the stove area (without being directly above it — that’s the range hood’s job), the more effective it is.
- Never cleaning the fan — A grease-clogged exhaust fan can lose 50% of its airflow capacity. Three months of Singapore cooking produces visible grease build-up.
Need Help With Kitchen Ventilation?
Kitchen ventilation can be tricky to get right, especially for open-concept layouts or if your kitchen wall doesn’t face outside. Visit us at 61 Kaki Bukit Avenue 1, #04-23 and our specialists can advise on the right fan size and placement for your specific kitchen layout.
Browse our full exhaust fan collection online or WhatsApp us at +65 8837 6682 for personalised ventilation advice.
Frequently Asked Questions
Do I need a range hood or exhaust fan for my HDB kitchen?
For enclosed HDB kitchens with heavy cooking, a range hood is strongly recommended as it captures grease, smoke, and odours directly above the stove. For open-concept kitchens or lighter cooking, a wall-mounted exhaust fan can be sufficient. Many Singapore households use both — a range hood over the stove and an exhaust fan for general ventilation — for the best results.
What CFM rating should my kitchen exhaust fan have?
For a standard HDB kitchen, an exhaust fan with 200–400 CFM is recommended. The general guideline is to have enough airflow to exchange the kitchen air 15 times per hour. For heavy wok cooking common in Singapore households, opt for the higher end (300–400 CFM) to effectively remove smoke and cooking odours. Open-concept kitchens may need even higher CFM ratings.
How do I ventilate an open-concept kitchen in Singapore?
Open-concept kitchens need stronger ventilation since cooking fumes can spread to living areas. Use a powerful range hood (at least 400 CFM) positioned close to the cooking surface, supplement with a ceiling or wall exhaust fan, and consider installing a glass partition that can be opened or closed as needed. Running the range hood for 5–10 minutes after cooking also helps clear residual odours.
How often should I clean my kitchen exhaust fan or range hood?
Clean the external filters and grille of your range hood every 2–4 weeks, especially with regular Asian cooking. Deep clean the internal fan and motor housing every 3–6 months. For wall exhaust fans, clean the blades and cover monthly. Grease buildup is a fire hazard and significantly reduces suction power, so regular maintenance is essential for both safety and performance.
Can cooking fumes damage my HDB flat?
Yes, poor kitchen ventilation can cause significant damage over time. Grease and smoke residue stains walls, ceilings, and cabinets yellow. Moisture from cooking promotes mould growth. Cooking odours can permanently absorb into soft furnishings and curtains. Proper ventilation with an appropriately sized range hood or exhaust fan prevents these issues and keeps your home cleaner and healthier.