HEAPETS P339 Review

If odour is your problem rather than dust, this is the more interesting of the two HEAPETS units. Its filtration stack runs to seven stages, and the layer that matters is bio-enzyme activated carbon — enzymes target the organic compounds responsible for pet and litter-box odour, which a plain carbon layer adsorbs less effectively. It pairs that with a 360° U-shaped air inlet and a custom pre-filter cotton intended to pull floating hair and dander out of the air before it settles, and it adds a PM2.5 display and air quality indicator so you can watch the machine respond in real time.

It is certified to EPA, ETL, FCC and CE requirements and complies with CARB and California Proposition 65 for indoor cleaning equipment, which covers product safety and emissions rather than cleaning performance. A pet lock stops paws and children changing settings, which is a small feature that a surprising number of listings forget.

Now the part that decides whether you should buy it. The listing claims coverage up to 4,200 square feet, and it does publish a CADR figure — 205 CFM, or 350 m³/h. There is no AHAM directory entry behind that number — we searched AHAM's certified directory and neither this model nor the HEAPETS brand appears in it — so it is the manufacturer’s own measurement rather than a third party’s, and it does not support the coverage claim: 205 CFM is 12,300 cubic feet per hour, and one air change per hour across 4,200 square feet only closes if the ceiling were about three feet high. So treat the room-size figure as marketing arithmetic rather than measured performance. Two further things to know: the same listing also carries a structured field reading 3,000 square feet, so it publishes two coverage figures at once. Compare on the filtration design and the odour layer, which are real, and disregard the room-size number.