CFS Carbon Pre-Filter 38002, Activated Carbon Pre-Filter 16"x48" Trim to Cut Sheets(1 Pack) 1 pack of 38002 Replace approximately every 3 months. Large 15-3/4" x 48" cut-to-fit activated carbon sheet! Made In USA by CFS Fits most Honeywell models, including series 10000, 11000, 12000, 13000, 14000, 15000, 17000, 18000, 40000, 50000, and 60000 Large amount of carbon Pad!!!!