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

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SECTION XX • XXXXXXXXX SECTION 3 • INSTALLATION
AIR SUPPLY AND VENTILATION
CONCENTRIC FLUE SYSTEMS
The 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. 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 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 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 (1ft), 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).
Air from Room or Internal Space
10cm 2 per kW Net input
10cm 2 per kW Net input
No Requirement for Ventilation
Air Direct from Outside
5cm 2 per kW Net input
5cm 2 per kW Net input