Based on the Affiliation of Home Appliance Manufacturers, an air purifier's efficiency ranking (clean air shipping and delivery price, generally known as CADR) should be equivalent to 2-thirds of the room's area. 2 pack chivalz air purifiers for bedroom, air purifiers for home bedroom, peaceful air cleaner with 24db rest https://electric-toothbrush32109.webbuzzfeed.com/26901065/everything-about-old-air-purifier