4
4
SPECIFICATION FOR FLUE SYSTEMS WITH AN EXTRA 90° ELBOW
(Refer to section 2.6(b) for maximum allowable lengths)
4(a)
•
•
•
Lb
Lw
4(b)
•
•
•
Lb
Lw
•
•
•
Lb
Lw
4(c)
Fig 4a - Use of the flanged elbow, one
extension kit, 90° elbow, and standard
flue assembly.
Equivalent length Shown
is 3045mm Where ‘Lb’ is 919mm
and ‘Lw’ is 820mm
(Lw is measured to the outside wall face.)
(Lw is measured to the outside wall face.)
Fig 4b - As 4a but with one
additional extension in length ‘Lb
Equivalent length Shown
is 3812mm Where ‘Lb’ is 1686mm
and ‘Lw’ is 820mm
(Lw is measured to the outside wall
face.)
Fig 4c - As 4a but with one
additional extension in length ‘Lw’
Equivalent length Shown
is 3812mm Where ‘Lb’ is 919mm
and ‘Lw’ is 1587mm
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