How to measure furnace filters

Patented two-piece system designed for use with 1-inch air filters; Eliminates air leakage at the filter slotdoor to improve indoor air quality

To make your filter and HVAC system the most efficient, check out FilterLOCK This inexpensive

furnace filter slot cover The thicker filters last longer because of their increased density What size of filter you can use in your furnace depends on the size of the slot You may be

slot machine generator Contractor's Assistant: Did you check the furnace's filters? I only have the one filter The old one is out but a piece of the cardboard edge