Preventative Maintenance Kit for Model 6020 Series (25 CF), 6040 Series (33 CF), 7000 Series (10-25-33 CF), 7340 Series (25-33 CF), 7350 Series (25-33 CF), 7400 Series (25-33 CF), 7900 Series (25-33 CF) Chambers. Includes (1) FIL-114 Filter Media, 25 PPI. Detailed Instructions Included.