B if the distance from the ridge is more than 3 metres the flue pipe must protrude at least 1000mm above roof penetration.
Flue height above roof nz.
This ensures correct operation of the burner limits back draughts and prevents flue gases impinging on the roof.
The top of the flue opening should be 3 ft 0 92 m above any roof surface.
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.
C the flue pipe must be more than 3 metres from any nearby structure.
This is for masonry chimneys.
For a gas vent or type l vent this height must be 2 ft 0 61m or more.
Refer to diagram b.
For an enclosure simulating a chimney this raises the question of how high above the enclosure to terminate the flue.
Checked the flue height above the roof is indicated and that it meets the height requirements set out in as nzs 2918 2001 domestic solid fuel burning appliances installation inspection of the installed heater.
If the flue exits the roof further down then it must extend high enough to acheive 2 3m of horizontal clearance.
A lf the flue pipe is within 3 metres of the ridge the flue pipe must protrude at least 600mm above the ridge of the roof.
New zealand metal roofing manufacturers inc.
The top of the flue system should be at least 1000mm above 4 2 metres from above flue collar panel to top of flue pipe the roof or at least 600mm higher than any obstacle or ridge within 3 metres of the flue.
Flues that are more than 3 metres away from the highest part of the roof need to be 1000mm above the flue penetration.
When installing a new twinwall flue system if the flue exits the roof within 600mm horizontally from the ridge high point of the roof then the flue must extend a minimum of 600mm above the ridge.
Flues need to be 600mm higher than the highest part of the roof within 3 metres.
How high does the flue have to go.
A if the flue pipe is within 3 metres of the ridge the flue pipe must protrude at least 600mm above the ridge of the roof.
The flue pipe shall extend not less than 4 6m above the top of the floor protector.
Refer to diagram c.
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.
As nzs2918 2001 4 9 1 a states the flue pipe shall extend not less than 4 6m above the top of the floor protector.
