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Wrap entire firebox and gather
in 100mm R3.5 fibreglass
insulation.
100mm clearance from
outer flue to header.
Header stud to be on
edge to ensure adequate
clearance
4. Clearance requirements
Fig 3.5
The Jetmaster 1500 and 1200 Open Fronted Fireplace and 75mm Hebel PowerPanel enclosure are to be installed with a 455mm
double skin flue kit (1500 single spigot gather) and 405mm double skin flue kit (1200 single spigot gather).
Double spigot gathers require twice the quantity of twin skin pipe (
refer to page 11 for flue requirements
)
The appliance and Flue Combination should be installed at the following clearances:
• Combustible mantle shelf clearances should be 1000mm above the opening as per clause 3.4.1.3(b) of AS/NZS 2918:2018
• Non-combustible materials - 500mm above opening
• The rear, sides and front of enclosure must consist of 75mm Hebel PowerPanel.
• The Hebel PowerPanel sides of the enclosure must be installed 15mm from the appliance with 100mm R3.5 insulation
compressed to 15mm between the PowerPanel and the appliance.
• The Hebel PowerPanel rear wall must be installed a minimum of 135mm from the rear of the appliance below the appliance
gather and 15mm at the top of the appliance gather with 100mm R3.5 insulation compressed to 15mm between the
appliance and Hebel PowerPanel.
• Double spigot gather is narrower. It is important to ensure Hebel cavity is within 15-25mm of the gather and the specified
insulation is compressed to this amount.
• The appliance rear wall, the gather, sides and all other external parts of the appliance must be wrapped in 100mm R3.5
insulation between the PowerPanel enclosure up to the height of the flue outer casing. Fig 3.5
• The Flue penetration through the ceiling must have a 50mm gap in all directions around the outer casing of the flue from
combustible materials.
• The front wall of the enclosure clearance box enclosure must be made of Hebel PowerPanel to a height of 1600mm above the
hearth and must extend to 75mm either side of the appliance.
• The External rear wall of the PowerPanel Enclosure can be placed against a combustible wall.
• The External side walls of the PowerPanel Enclosure can be placed against a combustible wall.
Clearance to an adjacent wall for units 1500
& 1200 and should be 1200mm as per clause
3.2.2(b) AS/NZS 2918:2018.
Double spigot installations must maintain the same clearance
specifications.
Ensure to fill insulation between the two sets of outer flue casings up
to 200mm above the gather.
Double spigot termination heights should be offset by 500mm to
reduce downdraft effects.
