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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
Install an access panel cover with a gasket and duct tape the edges
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
Right – HVAC furnace filter is properly installed in cabinet with gasketed cover to prevent air leakage
Size the filter box for the appropriate filter
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
When installing piping and wiring, do not block access to the filter