Review on RENPHO Large Room Air Purifier for Bedroom - Up to 720 Ft², True HEPA Filter Intercepts 99.97% Dust, Smoke, Odors, Allergens, Pet Hair - Quiet 26dB, CADR 170m³/h by Julia Lewis

After buying it last week, I unpacked it and happily set to work, especially now that I live in smoky Northern California. This is a good block and seems to be working as expected. I gave it 4 stars for the noise - it's very quiet in sleep mode but doesn't move as much air. At higher settings it's just fan noise and not very annoying, but too loud to sleep on. I generally underestimate for only one reason - I've tried ordering a replacement filter but they aren't available - from Revain and apparently from the manufacturer. If after a little searching I can't find replacement filters I will try to return them for a refund and buy another brand.