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2.2 Service Clearances
Front
A minimum of 500mm must be provided at the side facing away from the house.
End
A minimum of 300mm must be provided at each end of the heater.
Top
A minimum of 1000mm must be provided above the heater roof. This clearance must be maintained for the
entire surface area of the heater roof.
2.3 Flue Terminal Clearances
Heaters that are to be installed outside the house should be positioned so that when measured from the
edges of the flue, the following minimum clearances exist, which are in accordance with AS 5601:
75mm
•
From a drain or soil pipe.
150mm
•
Out from the wall against which the unit is mounted.
300mm
•
From any other flue terminal, cowl or combustion air intake.
•
To a return wall or external corner.
•
From the ground, above a balcony or other surface.
•
Below eaves, balconies and other projections.
•
Horizontally from an openable window, door, non-mechanical air inlet, or any other opening into a
building (except sub-floor ventilation).
500mm
•
From an electricity meter or fuse box (prohibited area extends to ground level).
1000mm
•
Vertically below an openable window, non-mechanical air inlet or any other opening into a building
(except sub floor ventilation).
•
From a mechanical air inlet, including a spa blower, measured both vertically and horizontally.
•
From a gas meter.
1500mm
•
In the direction of discharge and horizontally from an openable window, door, non-mechanical air inlet,
or any other opening into a building (except sub-floor ventilation)
For covered or recessed installations the following shall apply:
•
The covered area shall be fully open on at least two sides; or
•
When one side is open, the terminal shall be within 500mm of the opening, discharging in the direction
of the opening and there shall be no opening into the building along the wall within that distance.
In both options for covered and recessed installations the terminal shall be located to ensure that a free flow
of air across it is achieved.
