Air purifiers are comparable to the sound of a house fan. Most air purifiers have multiple speeds with the highest setting generally equal to the level of normal conversation. In most instances, you would only use the high setting for a quick cleaning then turn to medium or low in order to maintain the clean air levels. The medium and low settings

An air purifier is a device which removes contaminants from the air in a room. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke.