Manual/Spec Sheet These kits are designed to reduce noise, and remove impurities up to 45 PPI (Parts Per Inch) . These kits consist of three parts: A fan guard, media filter, and a retainer. Specifications: Guard: Material: UL94V-0 Plastic Spacing: UL .25" Easy Clean Media Filter: Material: PU (Polyurethane) Foam Particle Removal Size: 45 PPI Retainer Material: UL94V-0 Plastic Low Air Resistance Snap-On Installation Additional Model #'s 225-70-5380 225-705380 70-5380 705380 UPC: 038975753805