IDEAL imax W45 Installation And Servicing Manual page 19

23 ASSEMBLING THE FLUE
Flue terminals or extension ducts may be cut to shorter
lengths if required. When cutting a duct ensure it is square by
marking the length all the way around and only cut back the
plain end. When cutting concentric duct it is important that the
inner duct is maintained at 20mm longer than the outer duct to
allow correct connection of the ducts. Care should be taken to
support the inner duct when cutting the flue.
Wall plate
unpainted
-
Installation & Servicing
INSTALLATION
Note. Horizontal flue runs must be angled down between 1.5º -
3º towards the boiler to allow the condensate to drain. For this
reason it is recommended that a support bracket is used for
every 1m of extension pipe.
Care must be taken when assembling flues, not to damage the
seals.
See below for flue assembly examples.
Horizontal
concentric
terminal
Wall plate
painted
RF 2546
Vertical
terminal
Weather collar
flat (shown)
or pitched
19