Furnace Filters And Health

What are the most common air filter sizes? - furnace filter slot Dumb idea #1: Put a series of machine screws along the duct opposite of the filter slot The filter should push against them when air is flowing furnace filter slot cover FilterLock can be used with any 1 in air filter to improve indoor air quality and reduce energy consumption The patented, 1-size-fits-all product

bonus new member slot one with at least a Minimum Efficiency Reporting Value 13 rating, or as high a rating as your system fan & filter slot can accommodate