Progressively dense fiberglass to maximize dust holding capacity. The media and strut retainers are glued and sealed inside a one-piece, craft board frame made from 100% recycled materials. The filter frame is clearly marked with size, U.L. classification and air flow direction. GTA metal grill fiberglass series is available for nonstandard sizes only.
The Glasfloss GDS Series of disposable panel filters can be used as a direct replacement for filters supplied in original equipment. Standard sizes are available in 1" and 2" depths to accommodate most filter tracks and return air grills.