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2 - When the maximum total length for the default diameter of 130 mm is insufficient,
diameter 150 mm should be used. Any diameter enlargement must be carried out on both
air inlet and flue gas outlet.
Caution
Always make sure the installation is in compliance with the requirements stated in this
table.
Caution
Use a run-off of 50 mm per meter towards the water heater.
Calculate the maximum length of the air inlet and the flue gas outlet seperately:
Sum the lengths of the different pipe sections without bends. Ignore the length of
the adaptor box.
Sum the lengths of the bends. Ignore the bend in the adapter box:
Sum L
equivalent
for each 45° bend.
Sum L
equivalent
for each 90° bend.
Sum the lengths of the pipe sections and the lengths of the bends to calculate the
overall length of the air inlet and the flue gas outlet.
Adjust the length of the air inlet and/or the flue gas outlet when the overall length
exceeds the maximum length as stated in the table.
7.7.3 C43/C53/C63 systems
The length of the air inlet and flue gas outlet is the same for C43, C53 and C63 systems as
for C13 and C33 systems:
Refer to C13/C33 concentric systems for the maximum pipe lengths of concentric
systems.
Refer to C13/C33 parallel systems for the maximum pipe lengths of parallel systems
and non-concentric systems.
Note
Only use a C43 venting system when the common duct is a natural draught chimney. The
common duct is part of the building, not a part of the system.
Note
In a C53 venting system the flue gas terminal must be CE approved and must comply to
the EN 1856-1 requirements.
Note
Connect a C63 venting system to a separately approved and marketed system for the
supply of combustion air and discharge of flue gasses.
The flue gas terminal must comply to the EN 1856-1 requirements. The maximum
allowable recirculation rate is 10% under wind conditions.
Contact A.O. Smith for more information and/or part numbers of the C43, C53 and C63
venting systems.
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64 Installation, Maintenance and Service part
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