Genuine Ford accessory oil bath air cleaners (filters) for 1932 and 1933 4 cylinder and V8 cars and trucks for dusty conditions were offered through Service for added protection over the standard air filter / silencer.
These air cleaners were made by United, and were designed to fit the Zenith carburetor on the 4 cylinder and the Detroit Lubricator carburetor on the flathead V8.
The Model B Zenith carburetor used on passenger and commercial came standard with a stock air cleaner/silencer made by Burgess Battery Company.
Ford never offered a factory air cleaner for the Model A Zenith carburetor, but Air-Maze air cleaner offered one as an aftermarket accessory.