A.O. Smith BFM - 100 Installation & Service Manual page 31

is
3.9.8
.
Instruction manual BFM
A.O. Smith prescribes the use of a concentric roof or wall flue terminal,
exclusively of a type approved for the appliance. Use of an incorrect roof or wall
flue terminal can cause the installation to malfunction.
You must also 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!
• The transition piece to convert the air supply and chimney flue from parallel
to concentric must be installed immediately before the wall or roof flue
terminal.
• The intake duct of the air supply must be approximately the same as the
chimney flue.
• Make sure that the chimney flue discharges into an area approved for this
type of appliance.
See the figures. Wall flue terminal
120") and Roof flue terminal
120") for examples of installation.
Concentric wall flue terminal BFM100, 120
Wall flue terminal
(3.9.8 "Concentric wall flue terminal BFM100,
(3.9.10 "Concentric roof flue terminal BFM 100,
B
A
IMD-0226 R1
31