KNKAAPH4000

Air purifier · sold under 2 brands

DOE certified smoke CADR

226cfmDOE test

Dust 226 · PM2.5 226 cfm

Effective room size 350 sq ft (DOE)

DOE data as of 2026-11-03DOE record

Does it fit your room? How DOE sizes rooms

KNKA APH4000: certified to DOE with smoke CADR 226 cfm, dust 226, PM2.5 226, effective room size 350 sq ft. The same unit is also filed as FMUKL AP400. DOE data as of 2026-11-03.

Every model number on this record

Filed with DOE under basic model APH4000. A listing with any of these numbers is this unit.

Every model number filed under basic model APH4000, DOE data as of 2026-11-03
Model numberFiled by
APH4000 (DOE basic model)KNKA
AP400FMUKL
AP400WFFMUKL
APH4000WFKNKA

Same unit, 2 brands

  • KNKAAPH4000, APH4000WFListing above
  • FMUKLAP400, AP400WFNo listing matched

226 cfm under every name. Choose on price, warranty and what's in stock.

Both filed under DOE basic model APH4000. Listing status as of 2026-11-03.

Compare the 2 brands on one page

How much does the KNKA APH4000 cost to run?

About $4.60 a month, or $55.21 a year, on DOE's annual energy figure of 304 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 $3.04.

How does the KNKA APH4000 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 4.3 is tied for 42nd of the 63, and 14% below their median of 5.

DOE's annual energy figure for it is 304 kWh, against their median of 266 kWh: $6.90 a year more at the US average price.

Air purifiers for 300 sq ft (44 with a listing)

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

Smoke CADR (cfm)226

Higher than 59 of 140.

143591 cfm

Efficiency (CADR/W)4.3

Higher than 34 of 140. 2 others share 4.3.

313.5

Three to compare with

From models with a matched listing.

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

    DREAME CVF20B224 smoke CADR

    Room size 347 sq ft, CADR/W 8.8: about 51% less power for the same clean air.

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

    Honeywell HPA4300B229 smoke CADR

    Room size 354 sq ft, CADR/W 7.4: about 42% less power for the same clean air.

  • Nearest bigger unit

    Winix C610248 smoke CADR

    Room size 384 sq ft, CADR/W 6.2.

DOE record

Air cleaning

Smoke CADR
226 cfm
Dust CADR
226 cfm
PM2.5 CADR
226 cfm
Effective room size
350 sq ft
Efficiency (IEF)
4.3 cfm/W
Energy use
304 kWh/year

Record

DOE basic model
APH4000
DOE class
150 <= PM2.5 Clean Air Delivery Rate
Brands on the filings
2
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 350 sq ft, based on its smoke CADR of 226 cfm: CADR and room size.
How much does the KNKA APH4000 cost to run for a year?
About $55.21: DOE's annual figure of 304 kWh at 18.16¢/kWh, the US residential average for August 2026 (EIA).
Who makes the KNKA APH4000?
DOE's database has no manufacturer field, so the record doesn't say. It does show 2 brands filing one basic model, APH4000: KNKA and FMUKL.
Is the KNKA APH4000 the same as the FMUKL AP400?
Yes, by DOE's records. FMUKL files AP400 and AP400WF under the same basic model, APH4000, with the same 226 cfm.