1) The imported special air filter material and dust remove compound filter papercan ensure the high efficiency performed by our products2) Wide ply design, with large filter surface3) Galvanized cover, rust free4) Galvanized diamond mesh skeleton center, with high ratio of making holes5) Specialized sealing obturator foramen type of flexible neoprene6) Temperature: 65°C7) Relative humidity: 100%Various specifications of the cartridge and caps are available. We can modify specifications of our products to every specific size to satisfy every customer. We are looking forward to your further information.