FiltersFast Compatible Replacement for Whispure 150 & 250 Filter Compat. for Whirlpool Whispure 1183051 / 1187018 HEPA Filter Whispure 150 & 250 Filter Compat. for Whirlpool Whispure 1183051 / 1187018 HEPA Filter Also known by part number 1183051K Dimensions: 16" x 11" x 2" The FiltersFast 1183051 fits the following air purifiers: Whirlpool 250 Whirlpool AP250 Made in the USA!