Flue Height Above Roof Line Australia

Figure 3 7 3 2 section showing height and position of chimney.

Flue height above roof line australia.

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. 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 is for masonry chimneys.

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. This reduces the actual required height by 12 inches from our previous calculation of 64 inches. 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. 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.

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. This ensures correct operation of the burner limits back draughts and prevents flue gases impinging on the roof. Flues that are more than 3 metres away from the highest part of the roof need to be 1000mm above the flue penetration. 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.

Australian standard as nzs 2918 2001 requires a minimum flue height of 4 6 metres above the floor on which the wood heater is located. This means that below 38 degree roof pitches that the height of the flue outlet should be at least 1800mm above the roof when not close to the ridge and above 38 degree roof pitches the flue outlet height should be 2300mm horizontally back to the roof flue height figures are given in the table above where the flue is not close to the ridge. 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. Flues need to be 600mm higher than the highest part of the roof within 3 metres.

For a gas vent or type l vent this height must be 2 ft 0 61m or more. To achieve the correct flue height the flue kit must be at least 4 metres in length. Some installations may require even greater flue height to ensure adequate clearance above the roof or ridge line. The top of the flue opening should be 3 ft 0 92 m above any roof surface.