Prefilter for the White-Rodgers Electro-Air Thru-The-Wall Series 1400 cfm air cleaners. These filters have an aluminum frame with an aluminum mesh filter. Measured size of 20½ x 22¼ x 3/8 inch. Please measure your prefilter dimensions for accuracy.
One of these prefilters are in the model TTW1400 or 14C13T-410.
When cleaning the prefilter be careful not to flatten down the woven foil. The aluminum weave can be easily flattened with water pressure or when cleaning with a brush. Soaking the prefilters in a tub is recommended. See your owner's manual for washing instructions.