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Further details regarding the individual steps
Checking the balanced flue system soundness (annular gap
check)
A Combustion air port (ventilation
air)
For balanced flue systems tested
together with the wall mounted gas
fired boiler, some authorities waive
the requirement for a soundness test
(overpressure test) during commis-
sioning by the flue gas inspector.
We recommend that your heating
engineer carries out a simple sound-
ness test during the commissioning of
your system. For this, it would be suf-
ficient to check the CO
tration in the combustion air at the
annular gap of the balanced flue pipe.
Commissioning, inspection, maintenance
The flue pipe is deemed to be sound if
the CO
tion air is no higher than 0.2 % or the
O
2
If actual CO
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
or O
concen-
2
2
(cont.)
concentration in the combus-
2
concentration is at least 20.6 %.
values are higher or O
2
2
17
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