Purolator FI pleated filter cartridges provide a large surface area for maximum dirt holding capacity, high flow rates and low initial pressure drops. The normal flow direction for the FI Series is outside to inside, however, specially designed cartridges are available for reverse flow.

FI Series cartridges are manufactured using pleated, resin impregnated cellulose or glass cellulose blended media that are heat cured for strength and durability. Electro-tin plated center cores and outer bodies are the standard metal components. Cartridges are also available without the outer body. Thermosetting PVC adhesives and Buna N gaskets are standard.