Austin Air B410A1, Standard Designed specifically for pet owners: Rids home of pet allergens and dander One of the most powerful air purifiers on the market today - consistently ranked #1 in the world in any number of independent consumer and commercial tests. Cleans up to 1500 square feet of air in about 15 minutes, ridding your home of pet allergens and dander The 360 progressive four (4) stage filtering system purifies your entire living area up to twice an hour Use less energy than standard air purifiers - only 135 watts, to be exact. In addition, the home air purifier only requires a major filter change every five years, making the annual maintenance cost lower than most of the other brands on the market.