Most new villas on Koh Samui have open-plan kitchens that flow into the living room and terrace. That is wonderful for entertaining, but cooking smells, steam and grease travel quickly. Good ventilation is part of the kitchen design, not an afterthought.
Ducted extraction is best
A ducted hood that vents outside removes heat, steam and smells. Recirculating hoods only filter grease and odour, and they return humid air to the room. Plan the duct route early, before ceilings and beams are finished.
Size the hood to the hob
The hood should be at least as wide as the hob, and wider over an island. Island hoods need more extraction power because there are no walls to guide the air. Quiet motors matter in open living spaces.
Balance it with air-conditioning
A strong hood pulls air out of the room. If the villa is sealed and air-conditioned, make sure fresh air can come in, or the hood will struggle and doors may whistle. We coordinate this with your air-conditioning contractor.
Protect cabinets from steam
Use moisture-resistant boards and sealed edges near the hob and dishwasher. Leave a gap above tall appliances so heat can escape, and avoid placing wall cabinets directly beside the hood where steam collects.
Plan it with the layout
Send us your floor plan with ceiling heights and any beams. We will show the hood position, duct route and cabinet layout together so the kitchen works on the day it is installed.
Hood height and capture
Even a powerful hood fails if it is mounted too high or is too shallow. As a starting point, most hoods sit around 65 to 75 cm above an induction hob and a little higher above gas, but always follow the minimum height given for the model you choose. A canopy at least as deep as the front cooking zones catches steam before it drifts into the living room.
In open-plan villas on Koh Samui the terrace doors are often open in the evening. A cross-breeze across the hob pushes the cooking plume sideways, out of reach of the hood. Where possible, keep the hob out of the direct line between doors, or shelter it with a side panel or tall unit.
Ceiling fans need the same thought. A fan right above the hob scatters smoke and can make a gas flame flicker, so place fans over the dining or living area instead.
Duct routes that actually work
The duct matters as much as the motor. Keep it as wide as the hood outlet, often 15 cm in diameter, and never reduce it to fit a smaller hole. Every bend and every metre cuts airflow, so aim for the shortest route with no more than two or three gentle bends. Smooth rigid duct performs better and is easier to clean than flexible foil hose.
Run the duct to an outside wall, never into a roof void or ceiling space, where warm greasy air condenses and attracts mould and insects. Slope it slightly towards the outlet so condensation drains out rather than back into the hood.
Outside, fit a cover with a back-draught flap and insect mesh. On a coastal site choose a stainless steel or UV-stable outlet, and avoid facing it straight into the prevailing wind, which can push rain and salt air back down the duct.
A separate space for strong cooking
Thai cooking with high-heat stir-frying, chilli and fish sauce produces far more smoke and smell than most Western dishes. If you or your staff cook this way often, consider a small back kitchen or covered outdoor wok station beside the main open kitchen.
A back kitchen can have tiled walls, a simple stainless worktop, a strong wall-mounted extractor and a window that opens fully. The open kitchen in the living area then handles lighter cooking, breakfast and serving, and its cabinets see far less grease and steam.
Plan both spaces together. A short covered route between them, a second sink and enough sockets in the back kitchen let food and dishes move easily, and guests in the living room hardly notice the heavy cooking nearby.
Keep the system clean and working
In a warm, humid climate, grease and moisture build up faster than many owners expect. If you cook daily, wash metal grease filters about once a month, by hand or in the dishwasher. If any hood in the house recirculates, replace its carbon filter as the manufacturer recommends, because a saturated filter does nothing for smells.
Let the hood run for ten to fifteen minutes after cooking to clear the last steam from the duct. Many hoods have an automatic run-on setting for this.
Once or twice a year, check the outside outlet. Geckos, birds and insects like sheltered openings, and a jammed flap lets damp air and pests back in. Wipe and dry stainless surfaces regularly, as salty air on Koh Samui marks steel that is left dirty.
Ventilation mistakes to avoid
The most common mistake is choosing the hood after the ceiling is built, which leaves no duct route and forces a recirculating model. Another is buying the most powerful motor available. An oversized hood in a sealed, air-conditioned room is noisy and drags warm air in through every gap, while a moderate hood with a good duct often works better.
Also avoid boxing the hood in tightly between wall cabinets, or placing the fridge or an oven tower right beside the hob, where heat and steam collect against them.
If your current kitchen already struggles with smells or steam, send us photos of the hood, the outside wall and the room, and we will suggest what can be improved.