How to replace media filters on Aprilaire 4200 and 4400 Air Cleaners

Follow the instructions below to replace the media filter in the Aprilaire models 4200 and 4400 Whole-Home Air Cleaners.

First - Turn home thermostat mode to "OFF' and fan mode to "AUTO"

STEP 1 - Open air cleaner door and remove dirty filter

STEP 2 - Remove new media filter from carton

STEP 3 - Expand clean filter with Air Flow arrow pointing toward furnace or air handler.  Align filter top and bottom plastic rails with metal rails top and bottom of air cleaner opening

STEP 4 and 5 - Slide new filter into housing

STEP 6 - Replace air cleaner door

When steps above are complete - press reset on air cleaner control and return home thermostat to original settings