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3.29 Air Supply and Ventilation
34
3.29.1 Concentric Flue Systems
The following notes are intended to give guidance:
If the heater is to be installed in a room, NO VENTS ARE
REQUIRED.
If the heater is to be installed in a COMPARTMENT, permanent
air vents are required in the COMPARTMENT at high and low
level. These air vents must either communicate with a room or
internal space or be direct to outside air.
The minimum effective areas of the permanent air vents
required in the compartment are as follows:
Air vents should have negligible resistance and must not be
located in any position where they are likely to be easily
blocked, flooded or in any position adjacent to an extraction
system which is carrying flammable vapour.
Consideration must be given to the position of the high level
ventilation opening. A high level vent must not be sited within
300mm measured vertically of the flue terminal.
Grilles and louvres should be so designed that high velocity
air streams do not occur within the space housing the
heater(s).
3.29.2 Air vents areas
Ventilation must comply with requirements described in
IGE/UP 10, as a minimum 2 cm
provided at high and low levels to outside.
Note
Natural inlet with mechanical extraction must not be used.
Where a mechanical inlet and mechanical extraction system is
used, the design extraction rate must not exceed one third of
the design inlet rate.
All mechanical ventilation systems must be fitted with automatic
gas shut off safety systems which cut off the supply of gas to
the heater(s) in the event of failure of either the inlet or extract
fans.
The requirements for air supply by mechanical ventilation
are given in IGE/UP/10.
The permanent air vents shall be sited away from the extractor
fans. It may be necessary to increase the ventilation area to
compensate for the extractor fan.
Installation
2
per kW net heat input must be
3
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