Material: Curb is 14 gauge galvanneal steel and cover is 11 gauge aluminum extrusion with 24 gauge galvanneal steel liner
Finish: Silver textured powder coat paint.
Gasketing: Bulb neoprene door seal
Insulation: 1” polyisocyanurate (R-6) on curb and in cover
Hinges: Heavy-duty aluminum hinge with bolt pin
Hold-Open Arm: Clear zinc-plated steel hold-open arm with red plastic coating.
Latches: Fully enclosed automatic pull release latch unit – typical each end.
Operation: Torsion springs automatically open covers when 165°F fusible link melts or when exterior or interior pull handles are utilized. The hatch lids are dampened by a hydraulic shock to control operating speed.
Certifications: UL 793 listed and labeled up to 48” x 96”