If the area surrounding your filter isn't completely sealed, air can be

website furnace filter slot FilterLock · Filter Products · Filter-Monster · AllergyZone FilterLock Furnace Filter Slot Seal 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

furnace filter slot The 16x25x1 filter normally drops into a slot in the short horizontal run between the air intake downward duct and the furnace itself There  You can also measure the filter slot Your filter's MPR indicates its ability to capture tiny particles between and 1  I wish filters 34 thick would fit into my furnace filter slot but they don't even though the original filters that were in the slot in our new home

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