Glow-worm Inset BBU50 - Manual (Page 6)

6 221723B
Diagram 2.1
Diagram 2.2
2 Types of Installation
2.1 Hearth
In ALL cases there MUST be a non-combustible hearth under
the fire front.
For minimum dimensions of a hearth see diagram 2.1.
Carpet or similar floor covering must not be placed on the
hearth.
If the boiler is to be mounted above the prepared hearth the
hearth must still conform to the instructions above and the
dimensions given in diagram 2.1.
2.2 Fire Surround
The combined thickness of the surround and the lintel must be
checked, to ensure that the back boiler can be positioned within
the opening to allow easy connection of the flue into the boiler
flue socket, see diagram 2.2.
For fireplaces where the wall is not plastered and not covered
by BS1251 it is important that such installations comply with the
current issue of The Building Regulations.
Any combustible material, for example, blown vinyl wall coverings,
on the fire fixing face area of the surround must be removed, see
diagram 1.3.
2.3 Without Fire Surround
The builder’s opening, with lintel must have minimum dimensions
as shown in diagrams 1.2 and 2.2.
5423
6196
PREPARED
BOILER
BASE
HEARTH
300mm
650mm
50mm MIN
FIRE WALL FACE
165mm
MAX
PREPARED BASE
TOPS OF HEARTH
MUST NOT BE
ABOVE PREPARED
BASE
13mm MIN
NON-COMBUSTIBLE
MATERIAL
50mm
MIN
350mm MIN
FIRE FIXING
WALL FACE
*NOTE
This dimension can
be increased up to
190mm if builder’s
opening depth is at
least 375mm deep
*165mm
MAX
FLUE
PIPE
350mm
MIN