M1-1056 MERV 11 Furnace Filter for Model CMF1625, 15 3/8 x 25 1/2 x 5 1/4, Case of 3 by FurnaceFilters.Ca Case Pack:3 Replacement Filter for PCO3-20-16 PureAir

Replacement Filter for PCO3-20-16 PureAir Air Purification Systems

Model Number: DMH4-0400

it is difficult to tell if they are working  even though the power light is on

709 (709-L

For Home Sizes up to 2

M1-1056 MERV 11 Furnace Filter for Model CMF1625, 15 3/8 x 25 1/2 x 5 1/4, Case of 3 by FurnaceFilters.Ca Case Pack:3 Replacement Filter for PCO3-20-16 PureAirReplacement Part # M1 1056, Actual Size 15 3 8" x 25 1 2" x 5 1 4" Filter Has 24 Pleats, same as Genuine M1 1056 For Filter Cabinets CMF 1625A, AMU1625, GMU 1625, MU1625, MU1625A, BB1625, and NC1625 Air Flow Capacity up to 1400 CFM Made in Canada by FurnaceFilters. Ca Case of 3