Home Store Equipment Chemicals Accessories and Supplies Shop by Brand Safety and PPE Parts Education Clearance Shop by Brand My Account Shopping Cart Contact Us About Us +3 Guardian R500 Pro HEPA Filter 2.5"x18"x18" APC-H-R500 $102.00 In stock Quantity: 1 Add to Bag Product Details MPN: JAN-HVAC180 Brand: APC FILTRATION INC. Guardian R500 Pro HEPA Filter 2.5"x18"x18" HEPA air filter is the 2nd stage filtration for the GuardianR Pro 500 CFM HEPA Air Scrubber System. Part #4031864 Save this product for later Favorite