PANFIL Metal Frame filters are made from polyester synthetic media, two size by welded galvanized wire mesh. To increase the surface area and provide rigidity, this structure is corrugated and retained in a metal frame. Depending on the environmental conditions of operation, frames may be constructed from either galvanized or stainless steel. They are produced in 40mm,45mm, 48mm,95mm,98mm thickness. Different grades of media are available to provide G2, G3, G4 efficiency options.