(57) Discharge structure for closed gas appliances having an inner end and an outer end,
comprising: an outer tubular casing having an outer end and an inner end; an inner
gas exhaust pipe for the exhaust of combustion gasses having an outer end and an inner
end, the inner pipe being placed inside the casing to define an annular supply line
for combustion air therewith; a combustion air supply means, such as an air supply
hood, forming a connection between the ambient air and the annular supply line, near
the outer end thereof; a combustion gas exhaust means, such as a hood, forming a connection
between the ambient air and the gas exhaust pipe, near the outer end thereof, and
which is placed further from the inner end of the discharge structure than the combustion
air supply means, the combustion air supply means forming a main passage extending
between the ambient air and the annular supply line, and also being provided with
a venting passage, which forms a short circuit between the main passage and the ambient
air.
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