Glow-worm BBU 54/4 - Manual (Page 7)

7 2000225024C
Diagram 2.1
Diagram 2.2
2 Types of Installation
2.1 With Non-combustible Hearth
For minimum dimensions of a hearth, see diagram 2.1.
The back boiler must be installed level with the hearth or above
it, see diagram 2.1.
Carpet or similar floor covering must not be placed on the
hearth.
2.2 Combustible Hearth
If the hearth is existing and made of a combustible material the
back boiler must be installed to the dimensions in diagram 2.3.
2.3 With Surround
The combined thickness of the surround and lintel must be
checked, to make sure that the back boiler can be positioned
within the opening to allow easy connection of the flue into the
back 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 covering,
on the fire front fixing face area must be removed to a height of
625mm and 268.5mm each side of the centre line. These
dimensions will allow the standard frame, if fitted, to overlap the
remaining wall covering by 5mm.
This area, to the depth removed should then be rendered with
a sand/cement mixture.
2.4 Without Surround or Hearth
If there is to be any combustible material beneath the fire front,
for example, carpet, then the base of the builder’s opening must
not be less than 75mm above the floor covering as shown in
diagram 2.3.
The builder’s opening, with lintel must have minimum dimensions
as shown in diagrams 1.2 and 2.3.
The information regarding the fire front opening must be followed
together with the last three paragraphs of section 2.3.
5423
6196
PREPARED
BOILER
BASE
HEARTH
300mm
710mm
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
Diagram 2.3
1590
FIRE FIXING
WALL FACE
PREPARED BASE
TOP OF CARPET,
FLOOR COVERING
OR COMBUSTIBLE
HEARTH
N.B. *Minimum dimension.
This dimension refers to
minimum clearance after
carpet or any floor covering
has been fitted.
*75mm
350mm
MIN
COMBUSTIBLE HEARTH/ WALL
MOUNTED INSTALLATIONS