Steel: Cover and frame are 14 gauge (2 mm) G-90 paint bond galvanized steel.
Aluminum: Cover and frame are 11 gauge (2.3 mm) aluminum. Cover: Breakformed, hollow-metal design with 1" (25 mm) concealed fiberglass insulation, 3" (76 mm) beaded, overlapping flange, fully welded at corners, and internally reinforced for 40 psf (195 kg/m2) live load.Curb: 12" (305 mm) in height with integral capflashing, 1" (25 mm) fiberboard insulation, fully welded at corners, and 3-1/2" (89 mm) mounting flange with 7/16" holes (11 mm) provided for securing frame to the roof deck.Gasket: Extruded EPDM rubber gasket permanently adhered to cover.Hinges: Heavy-duty pintle hinges with 3/8" (9 mm) Type 316 stainless steel hinge pins.Latch: Slam latch with interior and exterior turn handles and padlock hasps.Lift Assistance: Compression spring operators enclosed in telescopic tubes. Automatic hold-open arm with grip handle release.Performance Ratings: Complies with UL 790 Class A (burning brand test).Finish:
Steel: Alkyd base red oxide primer.
Aluminum: Mill Finish. Hardware:
Steel: Engineered composite compression spring tubes. Steel compression springs with electrocoated acrylic finish. All other hardware is zinc plated/chromate sealed.
Aluminum: Engineered composite compression spring tubes. Steel compression springs with electrocoated acrylic finish.Type 316 Stainless steel hinges. All other hardware is zinc plated/chromate sealed.