Industrial Fire Doors

We are offering industrial fire doors. "fire rated door fire rating: 20 minutes, 45 minutes,60 minutes, 90 minutes, 180 minutes, certificate: whi,fm and iso steel fire rated door 1. Certificate: american standard whi (ul10c, ul10b, nfpa252) iso2000 chinese standard gb 12955-2010 2. Fire rating: 20 minutes, 45 minutes, 60 minutes, 90 minutes, 180 minutes 3. Door leaf and frame: 45mm thick leaf:sheet thickness 1.1-1.2mm（18ga）, glv. Or crs steel frame:sheet thickness 1.4-1.5mm (20ga), glv. Or crs steel