The GeneralAire 4785 is the correct replacement air proving switch for the following air cleaner models:
The GeneralAire G8-0217 Cleaner Air Proving Switch is a replacement collecting cell for the GeneralAire Grill Mount Air Cleaner. The GeneralAire G8-0217 air proving switch is installed next to the 24V transformer of your GA52F32 electronic air cleaner. The GeneralAire 4785 air proving switch is a vital electronic component of your air cleaner model and is an OEM replacement part.
GeneralAire G8-0400 Air Cleaner Collecting Cell specifications: