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5
1
7
5
4
6
9
2
Typical installation
Lintel or
Gather
Change in flooring
level to distinguish
hearth
Constructional Hearth
min 125mm thick
6
8
Fireplace Opening
X
400mm (16")
X
CONSTRUCTIONAL HEARTH
min 225mm
NON COMBUSTIBLE
125mm THICK MINIMUM
Z
Z = At least 150mm or to a
suitably heat resistant wall
Clay Flue pipe
Fireback to
BS1251
min 75mm
3
7
non combustible wall
min thick Y
Z
fireback and
insulated infill
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