Honeywell Allergen Plus HPA4300B
Room air purifier · suggested up to 354 sq ft · True HEPA (H13)
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The Honeywell Allergen Plus HPA4300B (AHAM model HPA4300B) is a room air purifier rated to clear 229 CFM of smoke-sized particles — enough for a room up to about 354 sq ft.
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$158.11 at Amazon
Honeywell HPA4300B room air purifier
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At a glance
Who it's for
Large living rooms and open-plan spaces that need real air-cleaning power.
The standout number
Smoke CADR of 229 — the number that decides how fast it clears wildfire smoke and fine particles.
The catch
AHAM's record lists no carbon stage. If odors or smoke smell matter, check the listing for a carbon filter before you buy.
What size room does the Honeywell Allergen Plus HPA4300B cover?
AHAM certifies it for rooms up to 354 sq ft. In a room that size it cleans the air about 4.9 times an hour on its top speed (our math: 229 smoke CADR x 60 / the room volume, with 8-foot ceilings). In a room half that size (177 sq ft) it would clean the air about 9.7 times an hour.
How much does the Honeywell Allergen Plus HPA4300B filter cost, and how often do you change it?
The maker says: “replace every 9 to 12 months (from Honeywell Plugged In HRFY3 page via search summary; page later blocked by Cloudflare, not re-read verbatim)” The matching genuine filter (Honeywell Genuine True HEPA Replacement Filter Y3) is $59.99 on Amazon. Changed at the short end (9 months) that is about $80 a year; at the long end (12 months), about $60. Maker source.
How do you reset the filter light on the Honeywell Allergen Plus HPA4300B?
The maker's manual says: “Reset Filter Light: With the unit powered ON, press and hold the Filter Reset button for 3 seconds until light turns off. The light will stay off until the next filter needs replacing.” Maker source: HPA4000 Series OM A013744R0 (HPA4100 / HPA4200 / HPA4300 Series owner manual).
The Verified Label — every AHAM-tested spec
ENERGY STAR listed
US market
Clean Air Delivery Rate (CADR) — source: AHAM
Coverage & power — source: AHAM (+ computed)
Filter & identity
How it ranks
Where this unit sits among the 236 room air purifiers we track, on the two numbers that decide one: how fast it clears fine smoke particles, and how big a room it covers. A higher percentile is better.
Smoke CADR
Better than 71%
of the 236 units with a published smoke CADR
Suggested room size
Better than 71%
of the 236 units with a published room size
Compare similar air purifiers
Every certified version of this unit
AHAM certifies each colourway and region separately, so this machine holds 5 certificates. They are the same purifier — identical CADR — sold under different SKUs. Each row is linkable.
| Certified model | Dust | Smoke | Pollen | Room |
|---|---|---|---|---|
| HPA4300Bthis page | 238 | 229 | 245 | 354 sq ft |
| HPA4300BC | 238 | 229 | 245 | 354 sq ft |
| HPA4300W | 238 | 229 | 245 | 354 sq ft |
| HPA4300W | 238 | 229 | 245 | 354 sq ft |
| HPA4300WC | 238 | 229 | 245 | 354 sq ft |
Frequently asked questions
How big a room does the Honeywell HPA4300B cover?
AHAM suggests it for a room up to 354 square feet. That rating assumes it runs on high and cleans the air about 4.8 times an hour. For faster cleaning — say for wildfire smoke or allergies — size it to a smaller room than the maximum.
What is the CADR of the Honeywell HPA4300B?
Its AHAM Clean Air Delivery Rate is 238 for dust, 229 for smoke and 245 for pollen, with a PM2.5 CADR of 233. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
Does the Honeywell HPA4300B use a real HEPA filter?
Its filter is listed as True HEPA (H13). True HEPA captures 99.97% of particles down to 0.3 microns.
How much power does the Honeywell HPA4300B use?
About 31 watts on its smoke-clearing setting, which works out to 7.4 CADR per watt — a measure of how much clean air you get for the electricity it draws. It is ENERGY STAR certified.
Where can I buy the Honeywell HPA4300B?
It's a retail unit — we matched its Amazon listing, linked on this page, so you can check the current price and seller. The replacement filters are the recurring cost — check those before you commit to a brand.
Sources. Clean Air Delivery Rate (dust / smoke / pollen), PM2.5 CADR, suggested room size, ENERGY STAR status and power draw come from the AHAM Verifide air-cleaner directory (the industry's independent CADR test). Average CADR, clean-air-per-watt and the percentile figures are computed by Verified HVAC Data from those published ratings. We publish no star ratings and take no payment for placement. "Not published" means AHAM's record doesn't disclose it — we never fill a spec with a guess.
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