Replacement Filter Kit, For Use With 60 cfm Carry-Air and Wall-Air Filtration Panels, Compatible with Brand Carry-Air, Wall-Air, Compatible with Manufacturer Part Number 9872-40W/O, 9872-W/O, 9874-MR, 9875-40W/O, 9875-W/O, Includes (2) 1st Stage Filters, 2nd Stage Filter, 3rd Stage Filter, Package Quantity 4