Standard sizes according to the number of inlets for foam or to the size of the riser. Choice and thickness of materials. Dimensions of glass in the door frame and marking thereon. May also be used for other purposes, e.g. fuel oil inlets and drencher systems.
BS 5041-5:1974 history
0000 BS 5041-5:1974(1999)
1974BS 5041-5:1974 Fire hydrant systems equipment - Specification for boxes for foam inlets and dry riser inlets