One unit, 2 brandsAPH4000
FMUKL AP400 = KNKA APH4000 · Air purifier filed by KNKA and 1 other brand
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KNKA - FMUKL
DOE certified smoke CADR, every brand
226cfmDOE test
Dust 226 · PM2.5 226 cfm
226 cfm under every nameChoose on price, warranty and what's in stock.
DOE data as of 2026-11-03DOE record
KNKA APH4000 and FMUKL AP400: all filed with DOE under one basic model, APH4000, certified at 226 cfm. DOE data as of 2026-11-03.
Sold as
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APH4000, APH4000WF
226 cfm
Check price on Amazon -
AP400, AP400WF
226 cfm
No Amazon listing matched as of 2026-11-03.
The filings
DOE lists 4 individual model numbers under basic model APH4000, filed under 2 brand names. Every filing lists the same figures: smoke CADR 226 cfm, PM2.5 CADR 226 cfm and a 350 sq ft room size.
| Brand | Model numbers | Smoke CADR | CADR/W | Room size, sq ft | Listing |
|---|---|---|---|---|---|
| KNKA | APH4000, APH4000WF | 226 | 4.3 | 350 | Check price on Amazon |
| FMUKL | AP400, AP400WF | 226 | 4.3 | 350 | None matched |
How we know it's one unit
Every brand here filed its model numbers under the same DOE basic model, APH4000. DOE's definition of a basic model (10 CFR 430.2) covers "all units of a given type of covered product (or class thereof) manufactured by one manufacturer" with "the same primary energy source" and nearly identical "electrical, physical, and functional (or hydraulic) characteristics that affect energy consumption, energy efficiency, water consumption, or water efficiency." So one set of DOE figures covers every name on the list. KNKA files APH4000 itself as one of its model numbers. The other brand files under it with its own numbers.
Brands may still differ in color, controls, accessories, warranty and support. Full record and every model number: KNKA APH4000.
How much does the APH4000 cost to run?
DOE's record lists 304 kWh a year, the annual energy figure from DOE's test. That's about $55.21 a year.
At 18.16¢ per kWh, the US average residential price for August 2026 (EIA Electric Power Monthly, table 5.6.A). Worked out from the certified figures.
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
Who makes the APH4000, and is it the same under every brand?
- Who makes the FMUKL AP400?
- The FMUKL AP400 is filed with DOE under basic model APH4000, which is KNKA's own model number. That makes KNKA the filer of record, though DOE's database has no manufacturer field to say who builds it.
- Is the FMUKL AP400 the same as the KNKA APH4000?
- Yes, by DOE's records. Both are filed under basic model APH4000 and list the same certified figures: smoke CADR 226 cfm, PM2.5 CADR 226 cfm and a 350 sq ft room size.
- Which brand of APH4000 is cheapest to run?
- They tie: every brand files smoke CADR 226 cfm, PM2.5 CADR 226 cfm and a 350 sq ft room size, so each costs about $55.21 a year to run.
Related units, shared brands
More: all units sold under several brands · all air purifiers