20
External Air Supply Fitting
The primary air can be taken from the room or alternatively it can come from an external source from outside
the building.
If taken from the room then air ducts are required to the room, as the fire will take its primary air from the chamber
around the fire that is fed by air from the room.
If air is required to be brought in from an external source then first the knockout at the rear of the outer box
should be removed by careful removal with a hammer.
This will allow a
63mm flexible pipe to be pushed through the back of the outer box and over the air chamber
pipe attached to the inner firebox.
The flexible pipe should be held in place with the circular clamp supplied.
It is usually easier to fit the flexible pipe to the inner firebox first then slide the flexible pipe through the knockout
hole in the outer box as the inner box is being slid into place. Then at this point the flex can be fed through any
holes in the wall or floor to an external air source. An open grille maybe attached to the end of the flexible pipe
to stop debris from blocking the pipe. Ensure that the grille does not restrict the air supply. The air requirements
are listed in the data table on page 5.
Where direct ducted air is fitted it is still necessary to fit fixed permanent ventilation into the room in accordance
with the requirements of approved Document J.
Outer box knockout
63mm pipe attached to inner box
63mm flexible pipe pushed through outer box
Inner Firebox “Engine” Fitting
Before sliding the inner fire box engine into the outer box check that the air linkage mechanism is
working correctly. Failure to do this may result in having to disconnect the flue at a later stage to remove
the inner box to be able to rectify the mechanism.
Onc
e this is done slide the inner box “engine” into the outer box. Guides allow for easy location. The guides on
the outer firebox have 2 slots cut into them at the front, one each side, see photo. As the inner box is slid
backwards, ensure that the tags on the inner box locate into the slots of the outer box, see photo.
This will position the inner fire box in the correct position.
Air linkage mechanism
Outer box slot
Inner box tag
