1200CRF NSA Replacement Combo Filter Set for 1200 Air Filter Contains one 3M Brand Filtrate Electrostatic Media and one EC-1270 Tri-Media Filter. Remove a broad spectrum of odors found in the environment (kitchen, pets, bathroom, etc.) Measures: Length - 8 1/4" , Height - 4 3/4" Suggested Replacement Period: 6 Months