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Installation
Installations below pipes or service ducts/tubes
In order to prevent the products of combustion and condensation
emissions from impinging on any bordering surfaces, the practice of
extending the flue terminal past the external face of the wall is
considered acceptable where the following conditions are met:
▶ The flue must not be closer than 25mm to combustible material.
▶ The flue must be adequately supported to ensure a constant fall back
to the appliance at an angle of 3°, (52mm per metre).
– Supporting approximately every metre for example at flue joint
connections and any change of direction.
▶ The flue terminal must extend 100mm from the wall to avoid
combustion and condensation emissions from impinging on any
bordering surfaces pipes or service ducts/tubes[1].
▶ The minimum clearances according to BS 5440-1:2008 are met.
▶ The maximum equivalent flue length (as stated in the Installation and
maintenance instructions manual) must not be exceeded.
1
Fig. 19 Installations under pipes or service ducts/tubes
[1]
100mm clearance from the wall to avoid combustion and
condensation emissions from impinging on any bordering
surfaces pipes or service ducts/tubes.
4
Installation
Flue considerations
▶ If extensions are to be added then the complete flue must rise at an
angle of 3° or 52mm for every metre of flue length.
▶ When using a 100mm diameter flue, a 125mm diameter hole through
the wall is required.
However, if installing the flue from inside the property and fitting the
weather sealing collar before the flue is pushed through the hole,
then a 150mm diameter hole is required.
▶ Flue terminations close to a light source can become dirty due to
large numbers of flying insects. Point out to the homeowner that the
outlet should be regularly cleaned.
WARNING:
Risk of poisoning due to escaping flue gases!
Flue gases can escape from a damaged flue system.
▶ When drilling fixing points in the outer flue tube, take care not to drill
into the inner tube.
10
WARNING:
Risk of poisoning due to escaping flue gases!
Flue gases can escape from incorrectly assembled flue system.
▶ Ensure all seals are correctly seated.
▶ Ensure joints are secured with the screws provided in the flue kit and
accessories.
▶ Ensure the flue system is adequately supported, approximately one
metre intervals and a change of direction.
▶ Ensure you carry out a flue integrity check when commissioning the
appliance.
4.1
Installing the fixed flue through the wall
WARNING:
Products of combustion!
To ensure products of combustions do not enter the property through
the flue hole.
▶ Where possible the flue hole should be sealed to the building fabric
on the inner and outer face using a suitable building material. As a
minimum, the flue must be sealed to the inner wall using a suitable
building material and the rubber collar fitted to the flue against the
outside face. Providing the face of the outside wall is flat then the
rubber collar is considered to be an adequate seal.
Correct orientation of the terminal assembly:
▶ Ensure that the "TOP" label on the terminal assembly is orientated
correctly before securing the fixed flue in position. This must be done
to allow the correct fit and use of the plume management system.
Refer to figure 20
▶ If installing an unmodified fixed flue kit:
– Slide the inner wall seal [1] onto the fixed flue.
▶ If fitting the flue from inside the property:
– Slide on the outer wall seal [2], locating the ridge on the seal with
the groove on the terminal.
– Slide the fixed flue [4] through the flue opening until the outer
wall seal opens out again on the outside wall.
– Pull the fixed flue [4] back towards the appliance until the outer
wall seal is in contact with the external wall.
– If the flue terminal is in a position that cannot be accessed with
reasonable ease then the flue tube must be sealed to the inner
wall with a suitable building material before sliding the inner wall
seal [1] into position. Providing the outer wall surface is flat then
the rubber collar is deemed to be an adequate seal.
▶ If fitting the outer seal from outside the building:
– Slide the outer wall seal onto the terminal as shown, locating the
ridge on the seal with the groove on the terminal.
– Slide the fixed flue [4] through the flue opening.
– Position terminal [3] through the flue opening in the wall to the
outside of the building by the distance shown.
– The flue should be sealed to the outside wall with a suitable
building material once the flue is assembled.
– Before sliding the inner wall seal [1] against the wall, seal the gap
around the fixed flue to secure in position.
Greenstar Condensfit II – 6 720 874 391 (2019/04)
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