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. There is no CADR figure anywhere on the page, and no AHAM certification. A 4,200 square foot claim from a unit in this class should be treated as marketing arithmetic rather than measured performance — applying the standard one-air-change-per-hour basis, 4,200 sq ft implies an airflow no machine of this size delivers at a realistic noise level. Compare on the filtration design and the odour layer, which are real, and disregard the room-size number.