Winix C545
Room air purifier · suggested up to 363 sq ft · True HEPA (H13) + activated carbon
A room air purifier rated to clear 234 CFM of smoke-sized particles — enough for a room up to about 363 sq ft.
Buy this purifier
No verified retail listingwe only link a listing we matched to this exact AHAM-certified model
Winix C545 room air purifier
Search the model number above at your usual retailer, then check what you find against the certified AHAM figures on this page.
Closest model we can link on Amazon: the Winix C610. It is a different purifier: smoke CADR 248 vs 234 for this one, rated for rooms up to 384 sq ft.
See the Winix C610 on Amazon →All 25 certified Winix models compared, with prices →
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 234 — the number that decides how fast it clears wildfire smoke and fine particles.
The catch
The carbon filter that handles odors and gases wears out faster than the HEPA — budget for replacements.
What size room does the Winix C545 cover?
AHAM certifies it for rooms up to 363 sq ft. In a room that size it cleans the air about 4.8 times an hour on its top speed (our math: 234 smoke CADR x 60 / the room volume, with 8-foot ceilings). In a room half that size (182 sq ft) it would clean the air about 9.6 times an hour.
How do you reset the filter light on the Winix C545?
The maker's manual says: “Resetting Filter Life: After replacing your True HEPA Filter, place the Pre-Filter back in and close the Front Panel. While the unit is on, hold the Filter Reset Button for at least 5 seconds until you hear the beep. After the beep, the Filter Replacement Indicator will disappear. The True HEPA Filter is now reset.” Maker source: C545 User Manual (part 2610-0256-00).
The Verified Label — every AHAM-tested spec
not ENERGY STAR
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 73%
of the 236 units with a published smoke CADR
Suggested room size
Better than 73%
of the 236 units with a published room size
Compare similar air purifiers
Frequently asked questions
How big a room does the Winix C545 cover?
AHAM suggests it for a room up to 363 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 Winix C545?
Its AHAM Clean Air Delivery Rate is 225 for dust, 234 for smoke and 237 for pollen, with a PM2.5 CADR of 230. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
Does the Winix C545 use a real HEPA filter?
Its filter is listed as True HEPA (H13) + activated carbon. True HEPA captures 99.97% of particles down to 0.3 microns. The activated-carbon layer also helps with odors and gases.
How much power does the Winix C545 use?
About 55 watts on its smoke-clearing setting, which works out to 4.3 CADR per watt — a measure of how much clean air you get for the electricity it draws. It is not ENERGY STAR certified.
Where can I buy the Winix C545?
We haven't matched a retail listing to this exact AHAM-certified model, so we don't link one — AHAM model numbers often differ from the name a retailer sells it under. Search the model number above at your usual retailer and check what you find against the certified figures on this page. 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.