FMUKL: 2 DOE certified models

FMUKL has 2 air purifier basic models certified to DOE as of 2026-11-03, rated smoke CADR 119 to 226 cfm. 2 are the same unit as models filed under other brands. How their efficiency compares with their DOE class is below.

Highest certified smoke CADR among its air purifiers: FMUKL AP400 at 226 cfm.

Source: DOE Compliance Certification Database (air purifiers), data as of 2026-11-03.

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Air purifiers

2 FMUKL air purifiers, listed models first. DOE data as of 2026-11-03.
#	Photo	Model	Labels	Smoke CADR, cfm	Room size	PM2.5 CADR	CADR/W	Brands	Amazon
1		FMUKLAP400filed as KNKA APH4000	CADR/W 4.3 Sold under 2 brands	226cfm, 350 sq ft	350 sq ft	226	4.3	2	Check price on Amazon
2		FMUKLAPH2500P	CADR/W 5.2 Sold under 2 brands	119cfm, 184 sq ft	184 sq ft	121	5.2	2	Check price on Amazon

How efficient are FMUKL air purifiers?

Of the 2 FMUKL air purifiers, 1 files a higher CADR/W than the class median and 1 falls below it.

FMUKL air purifiers against the median CADR/W of their DOE class. DOE data as of 2026-11-03.
DOE class	FMUKL models	Above median	Class median	Best FMUKL
Air purifiers, PM2.5 CADR 100 to 149 cfm (66)	1	1	CADR/W 4.65	APH2500P CADR/W 5.2
Air purifiers, PM2.5 CADR 150+ cfm (140)	1	0	CADR/W 5.5	AP400 CADR/W 4.3

A higher CADR/W means more clean air per watt.

Who makes FMUKL air purifiers?

DOE's database has no manufacturer field, so the evidence is whose model number each unit is filed under and which other brands file the same unit.

One of the 2 FMUKL basic models is filed under KNKA's own model number (APH4000).

FMUKL shares 2 units with one other brand, KNKA.

FMUKL units filed under another company's number or one DOE basic model with other brands. DOE data as of 2026-11-03.
Basic model	FMUKL model	Number belongs to	Brands
APH4000	AP400	KNKA	2
APH2500P	APH2500P	No known prefix	2

How much does a FMUKL air purifier cost to run?

DOE's annual energy figures for the 2 FMUKL air purifiers that file one run from 137 to 304 kWh a year: about $24.88 to $55.21 a year. The lowest is FMUKL APH2500P (119 cfm, CADR/W 5.2) and the highest FMUKL AP400 (226 cfm, CADR/W 4.3).

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.

How does FMUKL AP400 compare with other brands?

Picked by rule from models with a matched listing, DOE data as of 2026-11-03.

Within 20 cfm of its size, highest CADR/W: DREAME CVF20B, 224 cfm. 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 HPA4300B, 229 cfm. Room size 354 sq ft, CADR/W 7.4: about 42% less power for the same clean air.
Nearest bigger unit: Winix C610, 248 cfm. Room size 384 sq ft, CADR/W 6.2.

Questions about FMUKL

Is FMUKL a good air purifier brand?: How its 2 air purifiers compare on efficiency with their DOE class is above. One is filed under another company's model number (see who makes them above). We don't test reliability, noise or build quality, so we can't rank brands on those. How we compare models.
What room size are FMUKL air purifiers rated for?: DOE's effective room size for its 2 rated models is 184 to 350 sq ft, from a certified smoke CADR 119 to 226 cfm. CADR and room size.
Which FMUKL air purifier is the most efficient for its size?: FMUKL APH2500P, at CADR/W 5.2: higher than 36 of the 66 in its DOE class (air purifiers, PM2.5 CADR 100 to 149 cfm). At the other end is FMUKL AP400, at CADR/W 4.3, higher than 34 of the 140 in its class.
Is FMUKL the same as KNKA?: For 2 units, yes: both file them under the same DOE basic model (APH2500P and APH4000). Compare the 2 brands of APH2500P. Compare the 2 brands of APH4000.