Minimum clearence
between vertical
balanced flue terminals
Minimum clearence
between balanced
flue horizontal terminals
600mm
CWH90 max 50M Conventional
CWH120 max 40M Conventional
CWH90 and CWH120 max 14M Concentric
Over 1.5M use flue
condensetrap.
Condense Tap
drain
To
258
1.2M when using 90º bend
0.7M when using 45º bend
1.5M when using condense trap
For concentric flue runs
reduce overall length by:
Can be cut
to suit roof
structure
530
Can be cut to s
roof structure
uit
Angled r
flashing
E218
oof
hFlat roof Flas ing
E217
CWH90 max
50M Conventional
CWH120 max
40M Conventional
CWH90 max
14M Concentric
CWH120 max
14M Concentric
M1.5
CWH90 & CWH120 ALTERNATIVE FLUE SYSTEMS
INSTALLATION • SECTION 3
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