A hot kitchen and a smoky dining room usually trace back to the same exhaust system. Here is how to find which link is failing before you spend on a bigger fan.
When a restaurant kitchen is too hot and smoke drifts into the dining area, the cause is usually one of four things: the hood is not capturing the plume, the filters or duct are choked with grease, the fan is too weak or worn, or there is no make-up air so the kitchen goes into negative pressure. Check them in that order before buying a bigger fan or more aircon. ClickBina's kitchen exhaust guide puts a full system for a mid-size restaurant at RM12,000 – RM25,000 (market estimate 2026, Klang Valley), but many problems are fixed with far less.
A hot kitchen and a smoky dining room feel like two separate problems, and owners often attack them separately: a stronger aircon for the kitchen, an air purifier for the dining area. Both usually point back to the same system. The exhaust hood, the grease filters, the duct, the fan, the fresh-air intake and the discharge point work as one chain. When one link fails, heat and smoke that should leave through the roof stay in the kitchen, and whatever the kitchen cannot hold spills out through the pass-through and the door.
ClickBina's kitchen exhaust and ducting guide explains how a commercial system is put together. This page starts from the other end: you already have a system, it is not working, and you want to know why.
| What you notice | Likely cause | What to check first |
|---|---|---|
| Smoke rolls out from the front or sides of the hood | Poor capture: hood too small, too high or cross-drafts | Hood overhang and height; fans or aircon blowing across the line |
| Extraction has got weaker over months | Grease-loaded filters or duct, worn fan | Filter condition; when the duct was last cleaned |
| Kitchen door slams or is hard to open | No make-up air; kitchen in negative pressure | Whether any fresh air is supplied to the kitchen |
| Smoke and cooking smell in the dining room | Air being pulled from the dining area into the kitchen, or poor capture | Pressure balance; pass-through and door |
| Kitchen unbearable even with the hood running | Heat not captured, or hot intake air dumped on staff | Capture first, then where intake air enters |
| Neighbours complain about smell | Discharge point too low or near windows | Where the duct ends and what is near it |
Most kitchens have more than one of these at once. Work through them in order, because fixing capture and filters often makes a fan that looked too small perfectly adequate.
A hood can only remove what it catches. The plume from a wok range or a fryer rises fast and spreads; if the canopy does not overhang the cooking line enough, is mounted too high, or was sized for lighter cooking than the menu now needs, smoke rolls out around the edges however hard the fan pulls. ClickBina's exhaust guide notes that a high-heat wok range needs a deeper, higher-extraction canopy than a sandwich griddle.
Cross-drafts are the other common culprit. A pedestal fan pointed at the cook, an aircon outlet blowing across the line, or a back door left open can push the plume sideways, out from under the hood. Stand by the range during a busy service and watch where the smoke goes; the answer is often visible.
Baffle filters are meant to be pulled out and washed often. When they are left, grease clogs the gaps, the fan has to pull through a blocked screen, and extraction falls away gradually, so gradually that the kitchen team gets used to it. Grease that passes the filters settles inside the duct, narrowing it and adding a fire risk. ClickBina's exhaust guide lists grease-duct cleaning at RM600 – RM2,500 per visit, depending on duct length, grease load and frequency.
If the duct has no access panels it cannot be properly cleaned at all, and a kitchen with a weak exhaust and a duct nobody has opened in years should start there.
If capture is good and the filters and duct are clean, look at the fan. It may have been sized for a smaller menu or a shorter duct run, the motor or drive may be worn, or a fan meant for general ventilation may have been used on grease-laden air. A fan that is too strong is also a problem: it drags conditioned air out of the building and makes the kitchen noisy. The right size depends on the hood, the duct and the cooking, which is a design question rather than a matter of buying the biggest fan on the shelf.
This is the cause most often missed. Every bit of air the exhaust fan pulls out has to be replaced from somewhere. When a kitchen has no planned fresh-air intake, the fan starves, extraction collapses and the kitchen goes into negative pressure. ClickBina's exhaust guide describes the signs: doors become hard to open and smoke that should be leaving hangs in the kitchen.
A balanced system brings in fresh air through an intake fan, louvres or a properly sized opening to match what is being removed. In a Klang Valley kitchen that air is warm and humid, so where it enters matters: dumped straight onto the cooks, it makes the heat worse.
A kitchen in negative pressure pulls air from wherever it can, and the easiest source is the dining room next door. That sounds like the right direction, and it is when capture is good, but it also means the dining room's conditioned air is being dragged into the kitchen and out of the roof, and the dining aircon has to work harder. When capture is poor as well, the pressure swings every time the kitchen door opens, and smoke and cooking smell escape through the pass-through and the door into the dining area.
The fix is almost never an air purifier in the dining room. It is better capture at the hood, a planned fresh-air supply to the kitchen, and doors and pass-throughs that are part of the plan rather than an accident.
Most of the heat in a busy kitchen comes off the cooking line. If the hood captures it, it leaves with the exhaust; if the hood leaks, it spreads through the kitchen and no reasonably sized aircon keeps up. That is why ClickBina's exhaust guide warns that without extraction the aircon fights a losing battle it was never sized for. Fix capture before adding cooling.
After that, look at where the make-up air comes in, whether the dishwashing and steaming areas have their own extraction, and whether the kitchen layout puts staff between hot equipment and a wall with no air movement. Ceiling cassette and ducted units in the dining room also need their own upkeep, covered in our ducted and cassette aircon service guide.
Sometimes the kitchen works but the neighbours do not agree. A duct that discharges at head height, beside another unit's window, or into a shared airwell is one of the most common triggers for complaints to the JMB or the local council. The answer is usually to extend the duct to a better discharge point, which in a shoplot often means taking it up to roof level, and in a strata or mall unit means using the building's designated exhaust route. Our grease trap guide covers the other source of kitchen smell, the one in the drains.
Many kitchens are fixed with cleaning, a new filter set, a better-placed intake or a hood extension rather than a new system. The figures below are quoted from ClickBina's kitchen exhaust guide (market estimate 2026, indicative Klang Valley).
| Work | Indicative price | Notes |
|---|---|---|
| Grease-duct cleaning | RM600 – RM2,500 per visit | By duct length, grease load and frequency |
| Duct access panel | RM150 – RM400 per point | Makes a duct cleanable |
| Exhaust hood / canopy | RM1,500 – RM6,000 per hood | Size, stainless grade and baffle filters |
| Exhaust fan | RM1,200 – RM5,000 per point | Centrifugal or in-line, rated for the airflow |
| Ducting supply & install | RM250 – RM600 per metre | Galvanised or stainless; size-dependent |
| Full system, small cafe / cloud kitchen | RM6,000 – RM12,000 | Single hood, short duct, one fan |
| Full system, mid-size restaurant | RM12,000 – RM25,000 | Larger canopy, longer run, make-up air |
WhatsApp us your job details for a quote — we reply within the hour.
💬 WhatsApp for a quoteA fire-suppression system over the cooking line is a separate specialist item priced by the fire contractor, and is not included in these figures.
ClickBina is an experienced KL & Selangor contractor for whole-house refurbishment and trade coordination. If your kitchen is too hot or smoke is reaching the dining room, WhatsApp us your job details for a quote: the type of cooking, the size of the kitchen, where the duct goes and what you have noticed. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.
How we estimated prices: every RM figure on this page is quoted unchanged from ClickBina's kitchen exhaust guide, which labels them a market estimate for 2026 in the Klang Valley; they are not fixed rates or a quotation for your kitchen.
WhatsApp us your job details for a quote — we reply within the hour.
💬 WhatsApp for a quoteTell us what you need — we reply within the hour.