Babcock-Davis B-RHG Roof Hatch 30 x 36, Steel The Babcock-Davis B-RHG roof hatch is manufactured from galvanized steel to ensure years of dependable use, even in most extreme weather conditions. The lids are mounted on a 12" curb with cap flashing t o ensure against leakage. B-D roof hatches come standard with compression springs, zinc plated steel hardware, and insulation in the cover and at the curb perimeter. Babcock-Davis B-RHG Roof Hatch 30 x 36, Steel Features: • Cover & Liner: 14-gau ge galvanized steel cover with a 22-gauge steel liner • Curb: 14-gauge galvanized steel, Optional: Double wall curb (curb liner at exterior) • Hinge: Tamper-proof hinge contained within hatch as part of a spring assembly • Latch: Turn han dle • Spring: Greased compression springs enclosed in telescopic tubes, which counterbalance the door to require no more than 10 pounds of opening force • Hardware: Zinc coated steel, Optional: Stainless steel • Insulation: 1" thick rigid fiberglass in cover and 1" at curb perimeter • Mounting Flange: 3½" • Finish: Factory applied powder finis