Atmos Energy HE26 - Manual (Page 28)

5.5.6 80mm twin pipe flue system
Refer to the Atmos Price List for the full list of flue components.
Table of Atmos 80mm twin flue equivalent lengths
Terminal
The flue discharge at the terminal
must be at least 75mm in front of the
air intake and the distance between
the two pipes at least 75mm.
Maximum total length allowed is 60 metres
(ie Equivalent length of supply pipe + Equivalent length of flue discharge pipe) (Note: Includes
an allowance for the terminal; ie the terminal can be ignored from the equivalent length)
80mm components Equivalent length (M) Remarks
45 0 bend 1.5
87 0 bend 3.0
80mm Twin pipe extensions for balcony
outlet
When the free outlet is hindered by an eave,
balcony, gallery or anything else, the air supply
pipe and the flue discharge pipe must be
extended to at least the front side of the
overhanging part. (In this case the flue
discharge must be extended 75mm further than
the air supply pipe inlet).
When the air supply is not disturbed by
obstacles, such as a separating wall, and when
the outlet is not at the edge of a building, the air
supply pipe does not need extension (see
diagram).
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