What are the maximum measurements of a roof access hatch?

Minimum dimensions

Minimum clear width (inside dimension) of all types of roof access hatch is 700 mm x 600 mm. This size allows for safe access.

Maximum dimensions

Maximum clear width (inside dimension) for a roof access hatch without windows is 3000 mm x 1200 mm. Maximum clear width (inside dimension) of a roof access hatch with glass is 3000 mm x 1000 mm.

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