IMPORTANT:
1. The effective area requirements specified in the table are related to the maximum heat
input of of the heater(s), and are equivalent to those specified in BS6644.
2. The free area of the grilles should not be less than the size of the recommended
ventilation opening.
3. The supply of air to a space housing the heater(s) by mechanical means should be:-
(a) Mechanical inlet with natural extraction.
(b) Mechanical inlet with mechanical extraction.
NB!! 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 BS6644
Clause 19.3.
The permanent air vents shall be sited away from the extract fans. It may be necessary
to increase the ventilation area to compensate for the extractor fan.
INSTALLATION
SECTION 3
AIR SUPPLY
AND
VENTILATION
19
Summary of Contents for CSC39
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