CAD DETAILS: Steel Trap-door in concrete roof with 'Hold-open' arm

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This is a detailed construction drawing of a Waterproof Steel trap door manufactured out of sheet metal with a 'hold-open' arm with variable setting for easy exit & entry via the cat adder. Keywords: Steel roof, Duct roof door, Shaft roof door, Cat ladder shaft, Steel arm, Steel trap door, Steel swing door.
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