One unit, 2 brandsKJ100F
SEJOY AC400 = Purivortex KJ100F · Air purifier filed by Purivortex and 1 other brand
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Purivortex - SEJOY
DOE certified smoke CADR, every brand
47cfmDOE test
Dust 50 · PM2.5 48 cfm
47 cfm under every nameChoose on price, warranty and what's in stock.
DOE data as of 2026-11-03DOE record
AC400 (Purivortex and SEJOY): all filed with DOE under one basic model, KJ100F, certified at 47 cfm. DOE data as of 2026-11-03.
Sold as
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AC400, KJ100F, KJ100F-
C1, PX500 47 cfm
Check price on Amazon -
AC400, KJ100F, KJ100F-
C1, PX500 47 cfm
No Amazon listing matched as of 2026-11-03.
The filings
DOE lists 4 individual model numbers under basic model KJ100F, filed under 2 brand names. Every filing lists the same figures: smoke CADR 47 cfm, PM2.5 CADR 48 cfm and a 73 sq ft room size.
| Brand | Model numbers | Smoke CADR | CADR/W | Room size, sq ft | Listing |
|---|---|---|---|---|---|
| Purivortex | AC400, KJ100F, KJ100F- | 47 | 3.4 | 73 | Check price on Amazon |
| SEJOY | AC400, KJ100F, KJ100F- | 47 | 3.4 | 73 | None matched |
How we know it's one unit
Every brand here filed its model numbers under the same DOE basic model, KJ100F. 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. Both brands file KJ100F itself as their model number, so the number alone doesn't say which of them builds it.
Brands may still differ in color, controls, accessories, warranty and support. Full record and every model number: Purivortex KJ100F.
How much does the KJ100F cost to run?
DOE's record lists 68 kWh a year, the annual energy figure from DOE's test. That's about $12.35 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 90 air purifiers, PM2.5 CADR 10 to 99 cfm
Smoke CADR (cfm)47
Higher than 39 of 90. 2 others share 47.
1993 cfm
Efficiency (CADR/W)3.4
Higher than 43 of 90.
1.914
Who makes the KJ100F, and is it the same under every brand?
- Who makes the SEJOY AC400?
- DOE's records don't say. The SEJOY AC400 is filed under basic model KJ100F along with the Purivortex AC400. Both brands file that same number as their model, and DOE's database has no manufacturer field.
- Is the SEJOY AC400 the same as the Purivortex AC400?
- Yes, by DOE's records. Both are filed under basic model KJ100F and list the same certified figures: smoke CADR 47 cfm, PM2.5 CADR 48 cfm and a 73 sq ft room size.
- Which brand of KJ100F is cheapest to run?
- They tie: every brand files smoke CADR 47 cfm, PM2.5 CADR 48 cfm and a 73 sq ft room size, so each costs about $12.35 a year to run.
Related units, shared brands
More: all units sold under several brands · all air purifiers