BS 1251: 1987 British Standard Specification for Open-Fireplace Components (1987)
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Amongst other provisions this British National Standard lays down the sizes for the traditional open fireplace with its trapezoidal fireback used in Britain and Ireland for inset open fires made to BS 4834. The fires are given nominal sizes based on the approximate width of the fire front, 400mm (or 16 inch) being almost universal. 350mm (14 inch) are occasionally found in smaller rooms and 18" or 20" in larger rooms or where wood or turf are to be burned. There is also a small 12" (300mm) version occasionally installed in bedrooms.
Refractory firebacks are specified (as a single piece, or in sections for replacement fitting through the fireplace opening) of sizes...
A = 330, 380, 430 or 480mm for nominal 350, 400, 450 or 500mm fires (+15 -0)
B = 200, 250, 300 or 350mm for nominal 350, 400, 450 or 500mm fires (+15 -0)
C = 170mm (+15 -0)
G = 560mm (+10 -0)
H = 470mm (+10 -0)
J = 100mm (+10)
L = 43mm (+10 -0)
M = 150mm (+10 -0)
The masonry surround to be fitted in front of the fireback is to have an opening 560mm high (+0 -5) with an opening width of 360, 410, 460 or 510mm (+10 -0) for nominal 350, 400, 450 or 500mm fires, with a material thickness of 48mm to 55mm around the opening. The hearth is to extend at least 400mm in front of the opening (Revised in 1995 to 300mm in front of the opening, and 300mm in front of the appliance firebed) and at least 225mm at each side.
Sizes are also given for a throat-forming reinforced concrete lintel...
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