Room by Room · reference
Air Purifier for a Kitchen: What Size You Need
for a typical kitchen
EPA table, 200 sq ft row · 8-ft ceiling
Sizing a kitchen is the same floor-area arithmetic as any room: between the 100 and 200 sq ft rows, the published minimum is 130 cfm. The complication is not the number. It is what the room produces.
A kitchen makes two different problems. Cooking smoke and grease are particles, and particles carry a published rating. The smell of last night’s frying is a gas, and gases carry none, EPA publishes no CADR for odours at all. A kitchen is where that distinction stops being pedantic.
What the published table gives a kitchen#
A kitchen between the 100 and 200 sq ft rows takes the larger row: 130 cfm at an 8-foot ceiling. A kitchen open to the dining space is one zone, size the zone, not the cooktop corner.
If the open zone runs past 600 sq ft, the table ends and no stated minimum exists. Divide it into zones and size each as a room.
Particles are rated. Smells are not.#
Cooking smoke is a particle problem, and a rated one: it belongs to the same fine end of the test range as tobacco smoke, the smallest particles EPA tests. The tobacco-smoke CADR is the column to compare for it.
The smell is another story entirely. Odours are gas-phase, and no published CADR exists for gases. A unit advertised as "eliminating odours" is quoting a number nobody has defined.
The range hood is still the right tool#
Extraction beats dilution. A range hood pulls smoke, grease and moisture out at the source, before they spread through the home. An air purifier works on what is already in the room.
The two are not rivals. Ventilate with the hood while cooking; let a rated purifier handle the particles that escape. Neither will ever have a number for the smell.
Suggested next step
Compare what the table asks for
Search listings for the published minimum your room needs, then check the smoke CADR on the shortlist before anything else.
Placement and running#
If carbon sits in the filter stack, expect it to be the first part that needs replacing, carbon filters do the unrated work and wear out doing it.
- Not above the hob, grease coats filters, and a machine over the cooktop is a bad neighbour anyway.
- Out of the direct steam path; steam is not its job and it clogs filters faster.
- Near the kitchen’s open side, where air from the whole zone can reach it.
- Check the pre-filter more often than in any other room; cooking aerosols are sticky.
Where the marketing overreaches#
"Chef-grade odour elimination" is not a spec. There is no published test for it, no minimum for your room size, and no way to compare one brand’s claim with another’s.
What can be compared: the CADR. For a typical kitchen that minimum is 130 cfm, and everything else on the box is commentary.
Questions people actually ask
Sources
- U.S. Environmental Protection Agency, Guide to Air Cleaners in the Home (2nd edition), retrieved 2026-08-30
Quoted and transcribed, never paraphrased into new numbers. This site does not interpolate between published figures.
Suggested next step
One more angle before you decide
The minimum is settled, spend the rest of the decision on noise, filter cost and the smoke CADR.
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Printed from https://roomandfilter.com/rooms/air-purifier-for-a-kitchen, “Air Purifier for a Kitchen: What Size You Need”. Figures from U.S. Environmental Protection Agency, Guide to Air Cleaners in the Home (2nd edition), retrieved 2026-08-30. No prices are shown on this site, by policy.