HAMWORTHY HEATING LTD
7
PUREWELL VariHeat he
500001155/F
Figure 4.3 – Flue Connection Point
Flue Connection as delivered
4.3 Flues
•
Flue termination, routing and construction must comply with the requirements of the
Clean Air Act 1993—Chimney Memorandum, BS 6644 BS 5440 and IGE/UP/10.
•
Any flue must be self supporting and separable from the boiler for servicing
requirements.
•
Due to the possible flue gas temperature, 60 — 190°C, consideration must be given to
the construction and material of the flue system with fully sealed joints due to pressure
and condense in flue.
•
Flue construction is recommended of a twin wall, insulated type to maintain buoyancy
within the flue.
•
Care should be taken to ensure that the flue system is installed in such a way that any
condensation produced on start up, will drain away naturally.
•
Horizontal flue runs must be kept as short as possible and be inclined at minimum 2°
towards the termination.
•
The flue system must be designed acknowledging that there may be a positive pressure
generated by the boiler combustion fan. Refer to Appendix C - Fig C1.
•
Connecting flue systems may be smaller in internal diameter than the boiler
connection. Refer to Hamworthy Heating Technical Dept for assistance.
Flue Connection fitted
Flue fixing bracket
Flue Pipe
Elbow
