6
4.1 AIR AND FLUE DUCT LENGTHS - NO OFFSET
For a flat roof measure the distance from the appliance top
panel to the outside edge of the hole diameter marked on the
inside surface of the roof. This is dimension 'E
1
' Refer to Fig. 9.
For a pitched roof, measure the distance from the appliance
top panel to the highest point of the hole diameter. This is
dimension 'E
2
'. Refer to Fig. 9.
Determine dimension 'F' which must not be less than 300mm.
Duct Length = H — 92mm
Derivation: Dimension G= 1100 — Fmm
Dimension H= E — G
Refer to 2.2 for maximum duct length.
4. Measurement of Ducts
Air inlet flange
Weather sealing collar
(Secure with screw provided and
seal with silicone sealant)
Roof flashing (not supplied)
Flat roof
Pitched roof
Flue terminal assembly
(106mm) diameter
Fire stop spacer
Air and flue duct
extension kits (750mm)
Vertical flue adaptor
Appliance front
Height of
terminal assembly
1100mm
F
E
1
Measure from
appliance
top panel
H
Measure from appliance
top panel
G=1100-F
E
2
Measure from
appliance
top panel
300mm minimum
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