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Draft Requirements
The appliance is merely one component of larger system. The other equally important component
is the venting system. This is necessary for achieving the required flow of combustion air to the
fire chamber and for safely removing unwanted combustion by-products from the appliance. If the
venting system’s design does not promote these ends, the system may not function properly. Poorly
functioning venting systems may create performance problems, as well as be a safety hazard
(i.e. an oversized chimney may result in less than optimum performance. Installations into a large
masonry chimney may require a liner to improve performance).
THE RECOMMENDED DRAFT REQUIREMENTS FOR YOUR STOVE IS NO LESS THAN -.04
AND NO GREATER THAN -.08. OPERATION OF YOUR STOVE WITH A DRAFT GREATER
THAN -.08 CAN POSSIBLY CAUSE DAMAGE TO THE STOVE AND VOID THE WARRANTY.
SPECIAL NOTE: A barometric damper is recommended for installations of stoves in areas that
may have high winds, which can affect the draft. The installation must be only in units with a newly
constructed chimney, free of creosote deposits. The barometric damper is an automatic device
designed to regulate the draft in a heating appliance, which in turn, stabilizes the chimney temperatures,
lessening the potential of over-firing. Do not place the barometric damper greater than 24 inches (610 mm) above the
unit. Excessive draft will lead to poor control of the burn rate, possible over-firing of the stove and damage to the cast
iron components of the firebox. Most barometric dampers are calibrated in inches of water column and can be set to
draft requirements of -.03 to -.08 inches (-7.5 to -20 Pa). It is recommended that the barometric dampers to be set
between -.05 and -.06 inches.
Chimney Height requirements
According to the American National Standards Institute ANSI/NFPA 211-92, draft 1-7, a chimney or vent shall be so
designed and constructed to develop a flow sufficient to completely remove all flue and vent gases to the outside
atmosphere. The venting system shall satisfy the draft requirements of the connected appliance in accordance with
the manufactures instructions.
The “3-foot, 2-foot, 10-foot rule” on chimney height states that a chimney must be:
1. At least 3 feet higher than the highest part of the roof opening through which it passes,
2. and at least 2 feet higher than any part of the roof within 10 feet, measured horizontally.
Due to prevailing winds, local terrain, adjacent tall trees, a hill or ravine near the home, or adjacent structures,
additional chimney height or a special chimney cap may be required to assure optimum performance.
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.03
.04
.05
.06
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.08
.09
.05
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.9
1.0
IN. OF WATER DRAFT OR PRESSURE - LOW RANGE
IN. OF WATER DRAFT OR PRESSURE - HIGH RANGE
Draft gauge
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