9
System Chimney
CHIMNEY DIAMETER
The chimney size should be as recommended by the
appliance manufacturer. Where there is a requirement
for a flue diameter smaller than the appliance spigot,
then the operational requirements of the appliance and
the configuration of the flue must satisfy the flue sizing
requirements of EN13384-1 for single appliances, and
EN13384-2 for multi appliances.
CHIMNEY ROUTE
The chimney should remain as straight as possible through its
vertical run to assist flow. Should it be necessary to offset a
chimney run then the following guidelines should be adhered
to:
It is recommended that a vertical run of at least 600mm
should be allowed immediately above the appliance prior to
any change of direction. Within a system, on all fuels, there
should be no more than 4 changes of direction of maximum
45°. Factory made 90° bends or tees within the system may be
treated as being equal to two 45° bends (as per Document J of
the Building Regulations issued October 2010).
CONNECTION TO DRAUGHT DIVERTER
Where the appliance features a draught diverter the
connection should rise vertically from it for at least 600mm
before any change of direction (unless otherwise specified by
the appliance manufacturer). This is in accordance with the
recommendations contained in BS 5440 Part 1 section 6.1.4
DIRECT CONNECTION APPLIANCE TO SYSTEM
CHIMNEY
When connecting from the appliance directly to a system
chimney, the appropriate appliance connector must be used
and the joint between the appliance spigot and the appliance
connector must be securely caulked and sealed with non
asbestos rope (or suitable alternative) and fire cement on solid
fuel appliances.
ICS direct connection
from appliance
