The Levoit brand has even earned top ranks in our Real Simple in-house testing. Keep the windows closed while it’s running and place the air purifier as close to the middle as possible, a foot away from furniture and walls. Depending on the size of the room, even an air purifier designed for small rooms… Continue reading LEVOIT’s Vital 100 HEPA Air Purifier circulates 300-sq ft. of air every 18 minutes at $97