Where is the filter on the Criterion II
On a upflow model, the factory location for the air filter is just below the blower. Remove the front furnace doors to get to it.
If it is a downflow furnace, remove both furnace doors, and look inside the blower area, they will be sitting above the blower. Usually 2 air filters, in a "V" formation and are sometimes hard to get to.
If you do not find the filters here, someone has removed them or they may have been relocated to the return air grill, a large grill, usually located in the hallway or higher up on the wall.
If the Rheem factory air filter is still being used, it will be a black plastic frame and the filter area will look like a window screen.
Good luck and have a great day.
Paul
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