| Wind Loading on a multi-story building is another
common cause of smoke and backpuffing. As the wind flows against the
second story vertical wall, a high pressure zone develops at the chimney
top. Although a Vacu-Stack is not guaranteed as solution to this problem,
field reports show satisfactory results in more than 50 percent of the
installations.
The occurrence of smoke and backpuffing when air is calm may be caused
by a number of structural factors that relate to the heating system. The
chimney may be too short or the flue opening may be too large or small for
the heating appliances. Smoke may also occur if the chimney is blocked
with soot, creosote or debris.
In a relatively air-tight house, negative pressure problems can be
caused by appliances that exhaust the inside air, such as cooking ranges,
exhaust fans, a clothes dryer vent, furnaces or other devices. Your
individual chimney problem may be the result of a variety of
factors. |
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