Honeywell HPA4100B
Room air purifier · suggested up to 169 sq ft · True HEPA (H13)
A room air purifier rated to clear 109 CFM of smoke-sized particles — enough for a room up to about 169 sq ft.
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Honeywell HPA4100B room air purifier
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At a glance
Who it's for
A typical bedroom or living room that needs cleaner air.
The standout number
Smoke CADR of 109 — the number that decides how fast it clears wildfire smoke and fine particles.
The catch
It filters particles well, but with little or no carbon it does less for odors, smoke smell and gases.
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 218 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. Percentiles are computed from our corpus (higher = better).
Smoke CADR
Better than 21%
of the 218 units with a published smoke CADR
Suggested room size
Better than 21%
of the 218 units with a published room size
Compare similar air purifiers
Frequently asked questions
How big a room does the Honeywell HPA4100B cover?
AHAM suggests it for a room up to 169 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 HPA4100B?
Its AHAM Clean Air Delivery Rate is 117 for dust, 109 for smoke and 117 for pollen, with a PM2.5 CADR of 113. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
Does the Honeywell HPA4100B 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 HPA4100B use?
About 16 watts on its smoke-clearing setting, which works out to 6.8 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 HPA4100B?
It's a retail unit, so the fastest way to find it is to search for the exact model on Amazon and compare current sellers and price. 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.