Air Supply And Ventilation Concentric Flue Systems - andrews CWH30/200 Installation, Operation And Maintenance Manual

AIR SUPPLY AND VENTILATION CONCENTRIC FLUE
SYSTEMS
Th e following notes are intended to give guidance:
Where the heater is to be installed in a room, NO VENTS
ARE REQUIRED.
Where the heater is to be installed in a COMPARTMENT,
permanent air vents are required in the COMPARTMENT
at high and low level. Th ese air vents must either
communicate with a room or internal space or be direct to
outside air.
Th e minimum effective areas of the permanent air vents
required in the compartment are as follows:
Air Vents Areas
Position of Air Vents
High Level
Low Level
In a Room or Internal Space
Note: Both air vents must communicate with the same room or internal space or both must be on the same
wall to outside air.
Air vents should have negligible resistance and must
not be sited in any apposition where they are likely to be
easily blocked or fl ooded or in any position adjacent to an
extraction system which is carrying fl ammable vapour.
Consideration must be given to the position of the high
level ventilation opening. A high level vent must not be
sited within 300mm (1ft), measured vertically, of the fl ue
terminal.
Grilles and louvres should be so designed that high velocity
air streams do not occur within the space housing the
heater(s).
Air from Room or Internal Space
10cm per kW Net input
2
10cm per kW Net input
2
No Requirement for Ventilation
MAXXfl o Water Heater
INSTALLATION • SECTION 3
Air Direct from Outside
5cm 2 per kW Net input
5cm 2 per kW Net input
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