system, should rarely be off while a fire is present. If however, an
irregular or excessively high draft presents problems, the solution is the
use of a barometric draft regulator.
Installation requirements for a barometric damper (draft regulator).
- The diameter of the draft regulator must be equal or greater than
that of the Chimney connector.
- The draft regulator should be installed as close as possible to the
boiler, on the Chimney connection or on Chimney itself.
- The draft regulator adjustment should be made with a vacuum
gauge, if possible, with the boiler operating at full output. If the
start-up is made in warm weather, a readjustment may be necessary
in cold weather.
- If, at the maximum adjustment (maximum opening of the shutter of
the draft stabilizer), the draft is always higher than 0.10” (2.5 mm)
water column (25 Pa), a second draft regulator may be required.
- Recommended draft regulator location is shown (position 1).
The installation of a draft regulator as well as a blowback flap is strongly
recommended!
Nevertheless applicable federal and local codes have to be fulfilled!
Avoid 90 degree angled connections to the boiler flue collar. If the
chimney connection is mostly horizontal a cleanout tee is recommended
for ash removal
Basic boiler data for layout of Chimney system
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