Honeywell HPA300

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Before you buy, compare it with 2 recommended alternatives

No store here sells this model today, so beside it the highest-scored model with the same kind of station that one does, and the cheapest of the top 10.

Green is the best of these 3, also when they share the lead.

Price and ranking
	This model Honeywell HPA300	Highest score here Blueair Blue Pure 311i+ Max Best on 1 fact	Cheapest of the top 10 Blueair Blue Pure 311i Max Best on 1 fact
Lowest price	–	$224Blueair (brand store) best	$229Blueair (brand store)
Score	not in our ranking
Rank	–	rank 2 of 9 for open-plan spaces	rank 1 of 9 for open-plan spaces
Customer rating	–	–	–
Station
Room size same on all	open-plan spaces	open-plan spaces	open-plan spaces
Size, noise and age
Height lower is better	–	21 in (53.3 cm)	19 in (48.3 cm) best
On the market since	–	April 2025	December 2024

Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.

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Honeywell HPA300 specifications

The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.

Clean air delivery rate (CADR)300 cfm

Room size we compare on457 ft²

Power at the highest speed99.8 W

Cleaning performance 6 facts

Clean air delivery rate (CADR) How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster.: 300 cfm (510 m³/h)
CADR measured to The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not.: AHAM AC-1 (US standard)
CADR for smoke The CADR measured with tobacco smoke, the finest of the three test particles. It is the figure to read for wildfire smoke.: 300 cfm (510 m³/h)
CADR for dust The CADR measured with dust.: 320 cfm (544 m³/h)
CADR for pollen The CADR measured with pollen.: 300 cfm (510 m³/h)
Room size we compare on The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule.: 457 ft² (43 m²)

Noise and power 1 fact

Power at the highest speed The power the purifier draws at its highest speed.: 99.8 W

Extras 1 fact

CARB certified Certified by the California Air Resources Board as making little ozone.: yes

Warranty and certification 1 fact

AHAM Verifide certified The CADR is verified by AHAM, the US trade body that runs the test.: yes

Sources: ahamdir.com · ww2.arb.ca.gov

Frequently asked questions about the Honeywell HPA300

What size of room is the Honeywell HPA300 for?

The Honeywell HPA300 is sized for a room of about 457 ft², the room size we compare it on. Its clean air delivery rate (CADR) is 300 cfm, measured to AHAM AC-1 (US standard).

Does the Honeywell HPA300 make ozone?

It is CARB certified, which means it stays under California’s limit of 50 parts per billion of ozone.

Is the Honeywell HPA300 good for wildfire smoke?

Its CADR for smoke is 300 cfm. A higher number clears smoke from a room faster, so compare it with the size of your room.

The maker

Honeywell

Honeywell air purifiers are made and sold by Helen of Troy, which describes itself as a licensee of Honeywell Consumer Products. Helen of Troy says it manufactures, distributes and markets air comfort products, in four categories including air purifiers. Its annual filing for the year to 28 February 2025 lists Honeywell among its licensed brands.