A.O. Smith BFM - 100, Installation & Service Manual

Page: 27 / 74

Instruction manual BFM 27
is
3.9 Air supply and flue
3.9.1 Introduction
Warning
The installation should be carried out by an authorised installation engineer,
in compliance with general and local regulations (1.3 "Regulations") .
The BFM 30, 50 and 80 differ from the BFM 100 and 120 in how the air supply
and chimney flue are connected.
3.9.2 Installing chimney flue components for BFM 30, 50, 80
The BFM-appliances are approved for installation types C13 and C33. The
instruction manual describes these types. For a more detailed explanation,
please contact your supplier or the manufacturer.
Note
We prescribe the use of a concentric roof or wall flue terminal, exclusively of
a type approved for the appliance.
You must fulfil the following requirements:
•
The maximum permissible length of chimney pipe (A+B+C) is 7 metres.
• The maximum permissible number of 45° or 90° bends is 2.
• If you are using a horizontal pipe, you must mount it with a minimum run-off
of 5 mm per running metre of pipe towards the appliance!
• Make sure that the chimney discharges into an area approved for this type
of appliance.