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It must be airtight and its area of cross section must be constant.
The minimum area of cross section must be no less that 2.5dm2 (39sq. inches). On the other hand, an
excessively large area of cross section results in too great a volume, which is difficult to heat and is one of the
principal causes of a poor draw.
The height of the flue should be no less than 6 metres (20 feet) and the top should be above the ridge of the
roof and terminate without any form of restriction in the open air (no restrictions within 8 metres of the top of
the chimney e.g. overhanging trees).
It is recommended that a well-sealed cleaning access (cleaning trap) be placed approximately 50cm/20 inches
below the junction of the fireplace pipe with main flue.
Never use a flue pipe of a smaller diameter than that intended for the appliance or reduce it in any way.
The connection between the heater’s pipe and the chimney must be perfectly airtight.
NOTE:
It is essential to check that the room in which the appliance is installed is sufficiently well ventilated to provide an
adequate air supply.
The installation must be in compliance with local regulations and carried out by a qualified installer.
Installation of the heater:
The spigot is fitted on the back of the appliance. It is possible to connect the fireplace directly to the chimney
using a short horizontal length of pipe (Fig.3).
It is also possible to make a vertical connection to the back of the fireplace using a T-piece (Fig. 4).
Important Note:
If the floor consists of combustible material it must be protected by a raised plate providing 40cm (16 inches)
clearance in front of the fireplace. The plate must act as a heat shield and be absolutely non- combustible. This
could be stone, tiles or steel, etc.