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Instruction manual BFC 31
is
3.9.4 Parallel connections
The table states the maximum pipe lengths for parallel systems. The maximum
pipe length depends on the chosen diameter.
Warning
Install flue component pipe runs with a run-off of 5 mm per metre.
Table of pipe lengths
You must use the longest pipe when calculating the pipe length. For example, if
the chimney pipe is 35 metres and the air supply pipe is 32 metres, then 35
metres should be taken as the length for calculation. Next, add the L
equivalent
for
every 90° and 45° bend to this 35 metres, in both the air supply and flue gas
discharge. The following practical example illustrates how to use the table.
Practical example of parallel flue gas discharge
Example
The figure shows a BFC 100 installation. This has to be fitted with a 35m parallel
pipe 130mm in diameter plus eight 90° bends. We need to check whether this
configuration complies with the requirements stated in the table.
Appliance Diameter
1
Maximum
total length
L
equivalent
90° bend
L
equivalent
45° bend
BFC 80 130mm 115m 2.4m 1.4m
BFC 100 130mm 60m 2.4m 1.4m
BFC 80 150mm 115m 2.6m 1.6m
BFC 100 150mm 100m 2.6m 1.6m
1) Parallel systems with diameter of 130mm or 150mm. If the maximum total
length for a diameter of 130mm is insufficient, 150mm diameter should be
used. Any diameter enlargement must be carried out on both air supply and
flue gas discharge.