Rheem Furnace Inducer Vent Motor Assembly 51-21964-11 6.30 x 6.30 x 5.30 Genuine OEM. This is a Genuine OEM Rheem part. This inducer vent motor assembly (part number 51-21964-11) is for furnaces. Inducer vent motor assembly 51-21964-11 removes fumes from the combustion chamber and blows them into the exhaust vent system. Shut off the ... - Rheem Furnace Inducer Vent Motor Assembly 51-21964-11 6.30 x 6.30 x 5.30 Genuine OEM.