7
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.
ICID Plus direct connection
from appliance.
