Furnace 21 1 2 Filter, Pleated 16 Air 1 AC Filter, Pack x MERV x Aerostar 6 Air 8 3 8 waarbij de buitenste lens zonwerend waarbij de buitenste lens zonwerend is en de binnenste lens anti reflecterend en UV bestendig 9 liter per cyclus Increase frequency to every 30 days during peak summer and winter months Made with electrostatically charged synthetic material for high filtration efficiency with low air flow resistance Manufactured in the USA by Filtration Group Actual : 16 3 8" x 21 1 2" x 3 4" Comparable to 3M Filtrete MPR 600 Clean Living Comparable to Honeywell Micro Defense Plus FPR 5 Fights lint