Winix T810
AHAM verified
- Really cleans
- 411 sq ft38 m² 38 m²411 sq ft
- Box says
- 2,006 sq ft186 m² 4.9× overstated
- New filter
- 12 months
Honeywell · HPA300
Honeywell HPA300
Really cleansAHAM verified
457 sq ft42 m² 42 m²457 sq ft
At 4.8 air changes an hour with a 2.5 m ceiling
- Box says
- Extra large rooms up to 465 sq. ft²Extra large rooms up to 465 sq. ft² (43 m²) about right
- New filter
- Every 3–12 months
See it on Amazon: Honeywell HPA300Paid link
A long-running, no-frills console with a verified CADR and an honest room size. Cleans a living room with a dining area.
Verdict
Who it's for
Honeywell's printed room size matches our maths, and AHAM has verified the CADR. It's a simple machine with no sensor and no app. The cost is upkeep: three HEPA filters a year plus a carbon pre-filter every few months.
Good
- CADR verified by AHAM
- Printed room size matches the real one
- No ionizer
- Simple controls
Trade-offs
- Carbon pre-filter needs changing every few months
- No air quality sensor or auto mode
- Wide, boxy shape
Spec facts
Honeywell HPA300 · HPA300
- Really cleans
- 457 sq ft · 42 m²42 m² · 457 sq ftat 4.8 air changes an hour, 2.5 m ceiling
- Box claim
- Extra large rooms up to 465 sq. ft²Extra large rooms up to 465 sq. ft² (43 m²)about right
- Maker’s claim: Honeywell · checked 1 Nov 2026
- Filter
- Honeywell HEPA R filters (3) + A pre-filterThree certified HEPA filters (12 months) + carbon pre-filter (3 months). Replace every 3–12 months
- Maker’s manual: Honeywell · checked 1 Nov 2026
Certified: measured in an independent lab for AHAM’s Verifide programme. Maker’s claim: the manufacturer’s own figure, not independently checked. Where figures come from
Running it
Filter and upkeep
- Replacement filter
- Honeywell HEPA R filters (3) + A pre-filter
- Type
- Three certified HEPA filters (12 months) + carbon pre-filter (3 months)
- Replace every
- 3–12 months
A new filter every 3–12 months means 1–4 filters a year. Its parts wear out at different rates, as the type above says, so the range covers both.
We have no Amazon link for this filter: the maker's page in the sources sells or lists it.
Source: Maker’s manual, Honeywell, checked 1 Nov 2026
The box vs the maths
The box says 465 sq ft43 m². It really cleans 457 sq ft42 m².
To clean 465 sq ft43 m² it would only change the air in the room 4.7 times an hour. We size every purifier at 4.8 air changes an hour, the level AHAM's room-size guideline works out to.
Honeywell quotes AHAM's suggested room size, which is worked out at the same 4.8 air changes an hour, so the box and the maths agree. The small gap is the ceiling: AHAM assumes 8 ft (2.44 m), we use 2.5 m.
510 m³/h smoke CADR ÷ (4.8 × 2.5 m ceiling) = 42.5 m² = 457.2 sq ft42.5 m²
Use the calculator for your exact room and ceiling, or read how we pick.
The box claims Extra large rooms up to 465 sq. ft², about the 457 sq ft42 m² it really cleans. A rare honest box.
Room sizes
Which rooms it fits
It suits 269 sq ft25 m² and 322 sq ft30 m² rooms best: there it has 40–68% more air than the room needs, so it needn't run flat out. At 430 sq ft40 m² it only just keeps up (5% to spare), so it would run near its top speed, usually its loudest (why we don’t list noise). In rooms of 215 sq ft20 m² or less it's more than twice the size needed; a smaller model does the job.
Under a 2.7 m ceiling it covers 423 sq ft, under 3 m 381 sq ftUnder a 2.7 m ceiling it covers 39 m², under 3 m 35 m², so with a 3 m ceiling it no longer covers 430 sq ft40 m² (why).
For a 538 sq ft room or bigger it's too small: the For a 50 m² room or bigger it's too small: the 538 sq ft50 m² page lists models that cover it. In an open-plan space, add up every area without a door between (how).
Alternatives
The Honeywell HPA300 or one of these?
The certified models closest in size, and what is different about each, from the same kinds of source.
Cleans 411 sq ft, 46 sq ft lessCleans 38 m², 4 m² less. It has a PM2.5 sensor with auto mode and an ionizer you can switch off. It goes longer between filters (every 12 months).
Blueair Blue Pure 311i Max
AHAM verified
- Really cleans
- 431 sq ft40 m² 40 m²431 sq ft
- Box says
- 2,207 sq ft205 m² 5.1× overstated
- New filter
- 9 months
Cleans 431 sq ft, 26 sq ft lessCleans 40 m², 2 m² less. It has a PM2.5 sensor with auto mode. It has a different filter schedule (every 9 months).
Winix 9800
AHAM verified
- Really cleans
- 513 sq ft47 m² 47 m²513 sq ft
- Box says
- 2,506 sq ft233 m² 4.9× overstated
- New filter
- 3–12 months
Cleans 513 sq ft, 56 sq ft moreCleans 47 m², 5 m² more. It has a PM2.5 sensor with auto mode and an ionizer you can switch off.
Sources
Where these numbers come from
- Certified AHAM Verifide directory: Honeywell HPA300 series (HPA304, HPA8350B) · AHAM Verifide
- Maker’s claim Honeywell HEPA Air Purifier for Extra Large Rooms (HPA300 series) product page · Honeywell
- Maker’s manual Honeywell HPA090 to HPA300 series user manual (PDF) · Honeywell
We don't test purifiers ourselves: every figure on this page is copied from these sources and was last checked on 1 Nov 2026. Spotted one that's wrong or out of date? Tell us and we'll fix it and change the date.