Generalaire 990-13 Evaporator Pad Features: The aluminum evaporator material is enclosed in a heavy wire frame and channeling. Its super absorbent coating allows for maximum water distribution. Specifications: Size: 9 3/4"W x 11 3/4"H x 1 1/2"D For use with these models: Generalaire: SL-16 1137 709 1040/1042 This is for a single filter not a 2 pack. This is for a single filter Generalaire 990-13 Evaporator Pad Features: The aluminum evaporator material is enclosed in a heavy wire frame and channeling. Its super absorbent coating allows for maximum water distribution. Specifications: Size: 9 3/4"W x 11 3/4"H x 1 1/2"D For use with these models: Generalaire: SL-16 1137 709 1040/1042 This is for a single filter.