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BIASI B/40
PAGE 14
The B-40 Linear boiler is a high efficiency unit that requires proper venting. The boiler must
be vented to the outdoors by means of a tile lined masonry or an approved pre-fabricated chimney of
the size and height recommended by the manufacturer or by a listed "power venting" unit which
provides draft by mechanical venting .
The chimney discharge opening must be located at least 24 inches above any part of the
building structure within 10 feet of the chimney. Be sure the chimney and smoke pipe don't become
obstructed by squirrels, bird nests, soot buildup, chimney liner deterioration, etc. The "power ventor"
system should be installed on the leeward side of the building. Very specific requirements must be
met concerning clearances from combustibles and distances from doors and windows. Please consult
with manufacturer of "power ventor" for this information. In any case, the "ventor" must be installed
by a licensed burner mechanic and done in accordance with local codes. The B-40 boiler is a very low
stack temperature boiler (between 320 and 400F gross stack temp.) so caution should be used when
connecting to an outside built chimney. Should you have concern that the flue gases could condense,
then you should consider using a listed, "power venting" unit. If "power venting" is used to discharge
flue gases, then the power vent unit should be equipped with a postpurge control as well as delay-off,
timing control to prevent problems with fogging and nozzle post drip.
Note: 88% steady state efficiency is achieved when flue gas contains over 12.5% CO2 and the gross
stack temp. is below 350F.
The smoke-pipe connection from the boiler to the chimney should be as short as possible, with
a minimum number of elbows. The vent pipe must have a vertical rise of at least 1/4 inch per foot of
horizontal run. The vent pipe must be of the same diameter as the flue outlet on the boiler. The
chimney connector should have a minimum thickness of 24 gauge, corrosion resistant (galvanized)
steel, assembled with a minimum of three (3) sheet-metal screws, and sealed with high temperature
silicon at each joint. In most cases a barometric draft control isn't recommended as the B-40 is
designed to be pressure-fired. However, one may be needed if the boiler is being used in a high draft
situation.
10. Breeching and Venting: