Extended surface filters from Grainger remove bacteria, smoke, dust and other pollutants from the air. Choose a cartridge filter with a water-resistant, glass microfiber filter material to capture particles and clean the air, or a rigid cell box air filter that filters out pollutants using an ultrafine glass fiber reinforced with nylon on the air-exit side. Cartridge filters are utilized for many industrial applications in places such as hospitals, nurseries, food-processing plants and computer-equipment rooms.