Baldwin Filters RS3994 Radial Outer Air Filter

Baldwin RS3994 is a radial-seal outer air element designed to replace the air-filter stage in heavy-duty engines and equipment that specify Baldwin’s outer radial-seal filter. This element-only filter uses cellulose/paper media and a dedicated radial seal to help prevent unfiltered air from bypassing the filter and entering the engine, delivering cleaner intake air in dusty conditions. The RS3994’s dimensions are 15-27/32 in in length, 15-27/32 in in height, with a width of 8-11/16 in and an outside diameter of 8-11/16 in, making it compatible with round-oval housings that match these measurements. Sold as an outer air element (not a complete housing), it’s positioned within Baldwin’s radial-seal outer air element lineup for appropriate applications. Typical uses include large diesel or industrial engines and equipment where a radial-seal outer air element is specified, helping maintain performance and protect internal components during filtration cycling. When selecting a replacement, confirm your equipment’s service manual specifies RS3994 and verify housing compatibility and replacement intervals to ensure optimal filtration performance.