Planning air filtration into an open-kitchen renovation

Key takeaways

• An open kitchen shares its air with the living and dining area by design, not by accident
• Raise filtration with your interior designer at the layout stage, not after handover
• Size the combined open-plan space as one zone, not the kitchen alone
• Filtration works alongside the exhaust hood, it does not replace ventilation at the cooking source

Why lingering smell is a known trade-off of open-kitchen layouts

Removing the wall between kitchen and living area is a popular renovation choice in Singapore homes, and for good reason: it opens up a small floor plan and makes the space feel larger. The trade-off is that cooking smoke, frying oil odour and stronger dishes like fish or curry no longer stay contained to one room.

Without a physical barrier, that air moves into the dining table, the sofa, sometimes the bedroom corridor if the layout is compact. An exhaust hood over the stove captures a lot of it at the source, but hoods vary in suction strength and some smell inevitably escapes into the open room before it is drawn up.

This is not a flaw specific to any one contractor's work. It is a known characteristic of the layout, which is exactly why it is worth planning for rather than discovering after the fact.

Discussing filtration with your interior designer early

Most interior designers focus their ventilation conversation on the exhaust hood, since that is the fixed, built-in item. Filtration for the wider open space is easy to leave out of that conversation entirely, because it is not something the designer installs.

Raising it early lets you plan around it rather than working backwards from finished furniture. You can flag where a floor-standing unit would sit without blocking walkways, whether a power point is needed near that spot, and whether the open-plan layout leaves an obvious corner for it.

It also helps to mention it before finalising the exhaust hood spec. A designer weighing a stronger hood against your budget may size it differently if they know a purifier will also be running in the same open space, since the two work together rather than one replacing the other.

Sizing the combined kitchen and living space before furniture arrives

Once a wall comes down, the kitchen and living area function as one air volume, not two separate rooms. Size the purifier for the combined floor area, not just the kitchen footprint, using the standard formula: floor area in square metres multiplied by ceiling height in metres, multiplied by your target air changes per hour.

Singapore homes are generally recommended three to four air changes per hour, though a kitchen-heavy household that cooks daily with strong spices or frying may lean toward the higher end of that range. Measuring the combined space before furniture arrives, using the renovation floor plan, avoids the awkward exercise of measuring around a sofa and dining set later.

Run the combined dimensions through our air purifier size calculator to see which AIRE model matches the space.

Coordinating with the exhaust system design, not replacing it

An air purifier and an exhaust hood do different jobs, and neither one makes the other unnecessary. The exhaust hood captures smoke and grease-laden air at the source, right above the stove, and vents it outside the flat entirely. A room air purifier filters what has already dispersed into the open living space.

If the exhaust hood is undersized or the fan is left on the lowest setting to save on noise, more smoke escapes into the room for the purifier to handle. It is worth asking your contractor about the hood's actual extraction capability rather than assuming any hood does the same job.

Think of the two as sequential layers: strong extraction at the stove reduces how much the open-plan purifier has to manage, and the purifier then handles whatever gets past that first line.

Timing delivery around your renovation schedule

A purifier is one of the few appliances that does not need to wait until the very end of a renovation. Once dust-generating work like hacking, sanding and painting is done, running a unit with activated carbon filtration can help clear lingering paint and adhesive smell before you move furniture in.

Coordinate delivery with your renovation timeline rather than ordering it as an afterthought once the sofa is already delivered. If the unit needs a specific spot near a power point, that is easier to confirm with your contractor while the electrical layout is still being finalised.

Whatever the timeline, avoid running a purifier through the heaviest hacking and sanding stage, since construction dust in that volume is better handled by ventilation and cleanup than by the unit's filter life.

Next step

For a broader look at what actually suits a Singapore home once the renovation dust settles, see our honest guide to air purifiers in Singapore, which compares options across common budgets and layouts.

Frequently asked

Why is lingering smell a known trade-off of open-kitchen designs?

Removing the wall between kitchen and living area means there is no physical barrier stopping cooking smoke and odour from spreading into the open space. An exhaust hood captures much of it at the stove, but some smell escapes before it is drawn up, especially with strong cooking styles.

Should filtration be discussed with the interior designer early on?

Yes, raising it at the layout stage lets you plan a spot for a floor-standing unit and confirm a nearby power point before furniture is finalised. It also helps the designer consider the exhaust hood specification alongside filtration rather than in isolation.

Does filtration coordinate with or replace the exhaust system design?

It coordinates with it, not replace it. The exhaust hood extracts smoke and grease at the source and vents it outside, while a room purifier filters whatever has already dispersed into the open living space. Both work best together, not as substitutes for each other.

Related reading

• How to Remove Formaldehyde After Renovation in Singapore
• The Best Air Purifier in Singapore: An Honest Market Guide