AC INFINITY PRE-FILTER CLOTH FOR INLINE CARBON FILTER, 6-INCH, 2-PACKIn Store Location: L A clothed filter designed to lengthen the lifespan of your carbon filter by keeping debris from entering the charcoal bed. Each form fitting prefilter is made of polyester capable of blocking particles like dust, lint, pollen, and hair while allowing complete air passthrough. This ensures that your carbon filter properly traps odors in its activated charcoal and refines the air when used with an inline duct fan. The breathable