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2
(19 in
) for the 20/35F boiler. The free area of each vent may be halved if the
ventilation is provided directly from outside.
Flue system
The boiler must be installed so that the terminal is exposed to the external air.
It is important that the position of the terminal allows the free passage of air
across it at all times. The minimum acceptable spacings from the terminal to
obstructions, corners and ventilation openings are specified in the chart
below.
*If the terminal is fitted within 850 mm (34 in) of a plastic or painted gutter/pipe
or 450 mm (18 in) of painted eaves, an aluminium shield of at least 750 mm
(30 in) in length should be fitted to the underside of the gutter/pipe or painted
surface.
† If the terminal is fitted less than 2 m (6.6 ft) above a balcony, above ground
or above a flat roof to which people have access then a suitable terminal
guard must be provided.
A type K2 protective guard is available from Tower Flue Components Ltd at:
Vale Rise
Tonbridge
Kent
TN9 1TB
Tel: 0732 351555
Page 1
The flue tube assembly and terminal of the boiler must not be closer than 50
mm (2 in) to combustible material. When using side exit flue the flue tubes
must be protected if they are accessible to the User. Detailed
recommendations on protection of combustible materials and exposed flue
protection are given in BS5440:1:1978, sub-clause 20-1.
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