2 AF Brand Compatible Replacement Whirlpool 1183054K HEPA Filter & 4 Pre-Carbon Filters Fits Whispure Air Purifier Models AP450 and AP510 BY AF AF filter for Whirlpool 1183054K HEPA Filter Whispure Air Purifier models fits legacy models AP300 AP350 AP450 and AP510 True HEPA is the filtration type most recommended by doctors for people suffering from Allergies, Asthma, and other respiratory issues. Easy to install by simply snapping into place Includes 4 pre-carbon filters. Change approximately every 3 months 100% Satisfaction Guarantee...or your money back!