One unit, 2 brandsAPH4000 Pro
FUMKL AP400 Pro = KNKA APH4000 Pro · Air purifier filed by KNKA and 1 other brand
- KNKA
- FUMKL
DOE certified smoke CADR, every brand
369cfmDOE test
Dust 364 · PM2.5 367 cfm
369 cfm under every nameChoose on price, warranty and what's in stock.
DOE data as of 2026-11-03DOE record
KNKA APH4000 Pro and FUMKL AP400 Pro: all filed with DOE under one basic model, APH4000 Pro, certified at 369 cfm. DOE data as of 2026-11-03.
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The filings
DOE lists 2 individual model numbers under basic model APH4000 Pro, filed under 2 brand names. Every filing lists the same figures: smoke CADR 369 cfm, PM2.5 CADR 367 cfm and a 572 sq ft room size.
| Brand | Model numbers | Smoke CADR | CADR/W | Room size, sq ft | Listing |
|---|---|---|---|---|---|
| KNKA | APH4000 Pro | 369 | 5.6 | 572 | None matched |
| FUMKL | AP400 Pro | 369 | 5.6 | 572 | None matched |
How we know it's one unit
Every brand here filed its model numbers under the same DOE basic model, APH4000 Pro. 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 Pro 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 Pro.
How much does the APH4000 Pro cost to run?
DOE's record lists 387 kWh a year, the annual energy figure from DOE's test. That's about $70.28 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)369
Higher than 124 of 140.
143591 cfm
Efficiency (CADR/W)5.6
Higher than 72 of 140. 5 others share 5.6.
313.5
Who makes the APH4000 Pro, and is it the same under every brand?
- Who makes the FUMKL AP400 Pro?
- The FUMKL AP400 Pro is filed with DOE under basic model APH4000 Pro, 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 FUMKL AP400 Pro the same as the KNKA APH4000 Pro?
- Yes, by DOE's records. Both are filed under basic model APH4000 Pro and list the same certified figures: smoke CADR 369 cfm, PM2.5 CADR 367 cfm and a 572 sq ft room size.
- Which brand of APH4000 Pro is cheapest to run?
- They tie: every brand files smoke CADR 369 cfm, PM2.5 CADR 367 cfm and a 572 sq ft room size, so each costs about $70.28 a year to run.
Related units, shared brands
More: all units sold under several brands · all air purifiers