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After inserting the new filter, replace the filter slot cover to minimize air leakage and heat loss.
Furnace filters come in many sizes; verify the correct size when purchasing for proper fit in the filter slot.
If filter is inaccessible, locate the air filter between the return air plenum and the air handler box
If furnace is accessible, locate the air filter between the return air plenum and the air handler box
If the furnace is hard to access, locate filters at return registers covered by hinged grilles that are easy to open from inside the home
Insert the new furnace/air handler filter in the filter slot of the furnace or air handler with the arrow pointed in the direction of air flow.
Install the filter media box between the return air plenum and the air handler box
Leaks at the air filter cover panel can draw in unconditioned or undesirable air
Locate the fresh air intake away from pollution sources and in an easily accessible location
Remove the plastic wrap, but not the cardboard frame, before installing the furnace/air handler filter in the filter slot or above the return grate; note, the metal wire over the filter fabric can be very sharp.
Right – HVAC furnace filter is properly installed in cabinet with gasketed cover to prevent air leakage
The furnace filter slot cover should fit tightly to minimize air leakage but it should not be taped or caulked to enable frequent filter replacements.
This new filter is inserted into furnace filter slot on the return side of the furnace with the arrow on the side of the filter frame pointing in the direction of airflow, which is toward the furnace.
To increase surface area and reduce pressure drop for high MERV filters, the return duct can be constructed to permit the installation of two furnace filters side by side