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A nitrogen pressure test was completed on this ductless mini-split heat pump using a digital manifold gauge.
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.
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.
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.
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.