The GeneralAire 4749 is the correct replacement power control board for the following air cleaner models:
The GeneralAire R2-055D Power Control Board is a replacement power control board for the GeneralAire GA52F32 Grill Mount Air Cleaner. The GeneralAire R2-055D is a vital electronic component of your GA52F32 air cleaner. The GeneralAire 4749 in installed next to your 24V transformer and ensures that your grill mount air cleaner operates at peak efficiency to reduce airborne particulates.
GeneralAire R2-055D Power Control Board specifications: