Milcor- 48 in. x 48 in. M-7 Galvanized Roof Hatch

The Milcor 3501-515-9 roof hatch is a durable galvanized steel single-leaf hatch with a 48×48 inch clear opening. It features a 14 gauge galvanized steel cover and curb, rigid insulation in the cover, exterior fiberboard insulation in the curb, a white powder coat finish, EPDM gasket, and a spring-assisted cover that opens to 90 degrees. With a live load capacity of 70 psf, this model offers reliable performance for rooftop access in commercial or industrial settings.

Key Features:

• 48×48 inch opening suited for larger rooftop access or equipment passage
• Galvanized steel cover and curb with white powder coat finish for durability
• Insulated cover (1 in rigid polystyrene core) plus 1 in fiberboard curb insulation
• EPDM gasket adhered to cover; fully sealed corners for weather resistance
• Spring-assisted cover lift; automatic hold-open arm; slam latch with padlock hasps
• 70 psf live load rating

• Model: 3501-515-9 (M-7)
• Opening size: 48 in × 48 in
• Material: 14 gauge galvanized steel cover and curb; 22 gauge galvanized steel liner
• Finish: White powder coat on galvanized steel
• Curb height: 12 in
• Insulation: 1 in rigid polystyrene in cover; 1 in exterior fiberboard in curb 
• Gasket: Extruded EPDM rubber adhered to cover 
• Hinges: Steel pintle hinge 
• Lift-assist: Spring-assisted cover (torsion coil spring) 
• Latches: Slam latch with interior and exterior handles; padlock hasps 
• Load rating: 70 psf live load

• Confirm roof opening dimensions are 48×48 inches and curb support is structurally adequate.
• Place hatch curb over opening, ensure it is square and level.
• Secure the curb mounting flanges via pre-drilled holes with proper fasteners.
• Attach hinges, spring operator, latch handles, and hold-open arm as supplied.
• Test the hatch for smooth operation, check gasket seal, latch security, and cover opens fully to 90 degrees.

Q: What is the material of 3501-515-9?
A: It is constructed from galvanized steel (14 gauge cover and curb, with galvanized steel liner).

Q: What insulation is included?
A: The cover contains 1 in rigid polystyrene core; the curb has 1 in exterior fiberboard insulation.

Q: What is the load rating?
A: The live load capacity is 70 psf.

Q: Does the hatch include security features?
A: Yes; it includes a slam latch with interior and exterior handles and padlock hasps.