Glow-worm BBU 45/4 - Manual (Page 9)

9 2000225023C
3 Flue and Ventilation
3.3 New Chimney
A newly built chimney can be lined with a moisture resistant
lining, such as salt glazed pipe, of an appropriate diameter as
specified in the Building Regulations
In the case of a salt glazed lined flue, it is recommended that a
short vertical length of flue pipe, preferably flexible metallic be
used. Fix and seal it to the back boiler flue socket, make good
with approved packing and parge with fire cement, see diagram
3.1.
If a flue and false chimney breast are to be constructed all
openings for pipework to upper floors etc., must be sealed. The
only opening for the back boiler must be at the front, being of the
dimensions as shown in diagram 1.2.
If a specially built compartment is constructed for the back
boiler, it must conform to the requirements of the current issue
of BS5440 Part 1 and BS5871.
The flue should, preferably, end above ridge height but at least
above the eaves of a pitched roof. Use a certificated terminal.
3.4 Ventilation - Back Boiler and Fire
The room in which the back boiler unit is installed must have
adequate air inlets to ensure correct operation as specified in
the current issue of BS5440 Part 2.
Ventilation requirement, see vent sizes table.
This ventilation area takes into account the total requirement of
the back boiler unit and fire.
The ventilation openings may be direct to the outside air or with
an internal room or space (such as a hall) which itself has a
permanent air vent of the same effective area. The permanent
air vent should be in a position which will cause the least
nuisance to occupants, due to draughts.
This vent MUST NOT be placed in the builder’s opening.
If the appliance is to be installed in a room already containing
another fuel burning unit, the air supply required for this other
unit MUST be added to the figure above.
Any air vent taken through a cavity wall must be ducted.
3.5 Extract Fans
If an extract fan is fitted in the premises, there is a possibility that
if adequate air inlet openings are not provided spillage of the
products of combustion could occur.
When openings are fitted in accordance with the
recommendations of the current issue of BS5440 Part 2, extract
fans should not cause spillage.
Where such a fan installation is found, a clearance of products
test must be conducted as described in the fire front Installation
Instructions, Section 4.5.
This test must be carried out with the back boiler fitted with its
fire front.
See also Section 6.3 of these instructions.
Note: Refer again to Section 1.6 and diagram 1.2 and make
sure that there is sufficient depth for the back boiler unit.
VENT SIZES TABLE
45/4
Dovedale 4 64cm 2 / 10in 2
Chatsworth 4
Miami 4
Firelite 4
Contour 4
66cm 2 / 10.5in 2
B/Beauty 4
Heartbeat 4