Aprilaire 4822 Plastic Door w/Seal (Grey) The Aprilaire 4822 air cleaner door is a replacement part that is designed for use with the new style Aprilaire 4822 2200 The Aprilaire 4822 air cleaner door is held in place by four plastic strikes that are attached to the back that snap into the four corresponding latches on the outer housing The Aprilaire 4822 air cleaner door includes the foam seal