PermaLife filtration removes up to 99.5% of airborne particles as small as 0.5 microns in size including smoke, dust, pollen, pet dander, mold spores and dust mite debris Paperboard frame Foam gasket seal around inside edge Clean using upholstery attachment of vacuum cleaner Approximate Dimensions: 6-3/4 x 2-1/2 x 12-1/4 inches Filter-Monster branded replacement for Hunter 30966 PermaLife filter removes smoke, dust, pollen, pet dander, mold spores, and dust mite debris from the air. Fits Hunter Air Purifier Models: 30747, 30748, 30750, 30856, 37748, 37750