Figure 3 7 3 2 section showing height and position of chimney.
Flue height above roof line australia.
The chimney or flue must terminate not less than 300 mm above the highest part of the building within a horizontal distance of 3 6 m of the chimney or flue see figure 3 7 3 2.
The distance between the cowl of the flue and the adjacent roof wall structure should be higher than 2 3 mtr.
Please note that this rule doesn t generally apply to pellet and gas vent systems.
So 28 inches plus 24 inches is a chimney height of only 52 inches.
Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it.
This reduces the actual required height by 12 inches from our previous calculation of 64 inches.
For further information contact the gas safety technical information line on 1800 652 563.
A vertical line drawn along the up roof side of the chimney from the roof surface to the top of the chimney flue opening shall be at least 3 ft in height.
The same standard also states that the end of the flue cannot be near any windows or doors so as to prevent expelled air from being pushed back into your home.
The minimum chimney height recommended for minimum performance of wood burning and multi fuel appliances is 4 5 m from the top of the appliance to the top of the chimney.
This ensures correct operation of the burner limits back draughts and prevents flue gases impinging on the roof.
For a gas vent or type l vent this height must be 2 ft 0 61m or more.
If the flue is over 3 m from the roof apex the flue top must be 1 000 mm minimum above the roof and at least 3 m horizontally from the roof surface.
The location of the flue terminal of a balanced flue appliance room sealed appliance a fan assisted appliance or an appliance designed for outdoor installation shall comply with the figure below.
Flues that are more than 3 metres away from the highest part of the roof need to be 1000mm above the flue penetration.
The top of the flue opening should be 3 ft 0 92 m above any roof surface.
This is for masonry chimneys.
2 australian standard as nzs 2918 2001 requires a minimum flue height of 4 6 metres above the floor on which the woodheater is located.
Some installations may require even greater flue height to ensure adequate clearance above the roof or ridge line.
To achieve the correct flue height the flue kit must be at least 4 metres in length.
