The KRP-450FR has a textured frame and bead so drywall joint compound can be applied in sufficient thickness to conceal the flange. The KRP-450FR is non-insulated for wall installation only and rated by Underwriters Laboratories for 1.5 hours "B" label in walls.
Frame shall be 16 gauge steel, surrounded by galvanized drywall bead.
Door shall be 16 gauge steel, and shall open to 175°, be self-latching with automatic closer and interior latch release.
Hinge shall be continuous piano hinge.
Latches shall be bolt type, operated by either a ring turn or flush key device (both provided and all keyed alike), or doors shall be prepared for locks which shall be supplied by others.
Finish shall be prime coat of rust inhibitive electrostatic powder, baked enamel or Stainless steel with No.4 stain polish finish.
Gasketing on 3 or 4 sides is also available.