WinixC909

Air purifier

DOE certified smoke CADR

337cfmDOE test

Dust 340 · PM2.5 339 cfm

Effective room size 522 sq ft (DOE)

DOE data as of 2026-11-03DOE record

Does it fit your room? How DOE sizes rooms

Winix C909: certified to DOE with smoke CADR 337 cfm, dust 340, PM2.5 339, effective room size 522 sq ft. DOE data as of 2026-11-03.

Every model number on this record

Filed with DOE under basic model C909. A listing with any of these numbers is this unit.

Every model number filed under basic model C909, DOE data as of 2026-11-03
Model numberFiled by
C909 (DOE basic model)Winix
9800Winix

How much does the Winix C909 cost to run?

About $7.46 a month, or $89.53 a year, on DOE's annual energy figure of 493 kWh.

Electricity at 18.16¢/kWh, the US residential average for August 2026 (EIA Electric Power Monthly, table 5.6.A). Each 1¢/kWh you pay above or below 18.16¢ moves the yearly figure by $4.93.

How does the Winix C909 rank in its DOE class?

In its DOE class (air purifiers, PM2.5 CADR 150+ cfm), 63 models have a matched Amazon listing. Its CADR/W of 4 is 49th of the 63, and 20% below their median of 5.

DOE's annual energy figure for it is 493 kWh, against their median of 266 kWh: $41.22 a year more at the US average price.

Air purifiers for 500 sq ft (10 with a listing)

Among 140 air purifiers, PM2.5 CADR 150+ cfm

Smoke CADR (cfm)337

Higher than 111 of 140.

143591 cfm

Efficiency (CADR/W)4

Higher than 26 of 140.

313.5

Three to compare with

From models with a matched listing.

  • Within 20 cfm of its size, highest CADR/W

    Blueair 4412311000321 smoke CADR

    Room size 498 sq ft, CADR/W 10.2: about 61% less power for the same clean air.

  • Nearest size in its class with a higher CADR/W

    BOSCH Air 6000339 smoke CADR

    Room size 525 sq ft, CADR/W 6.9: about 42% less power for the same clean air.

  • Nearest bigger unit

    WOZOYO Pure Air PA6363 smoke CADR

    Room size 563 sq ft, CADR/W 5.8.

DOE record

Air cleaning

Smoke CADR
337 cfm
Dust CADR
340 cfm
PM2.5 CADR
339 cfm
Effective room size
522 sq ft
Efficiency (IEF)
4 cfm/W
Energy use
493 kWh/year

Record

DOE basic model
C909
DOE class
150 <= PM2.5 Clean Air Delivery Rate
Brands on the filings
1
In DOE's list since
2026-11-02first snapshot we hold

Questions

What room size is it for?
DOE lists an effective room size of 522 sq ft, based on its smoke CADR of 337 cfm: CADR and room size.
How much does the Winix C909 cost to run for a year?
About $89.53: DOE's annual figure of 493 kWh at 18.16¢/kWh, the US residential average for August 2026 (EIA).