HearthStone Quality Home Heating Products, Inc ®
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WFP-75 Model 8411
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The minimum chimney system height for a straight installation is 15 ft. (4.6 m) from the base of the
appliance to the chimney cap. If only the minimum height of the chimney system is installed, the
operating conditions must be optimal.
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All chimney installations must include at least one support. Reducing the amount of chimney weight on
the fireplace will help avoid the noise created when the fireplace expands. This can be achieved by
having the chimney supported by the supports. The maximum chimney length that should be supported
by the fireplace is 9 ft. (2.75 m) for 2" Solid Pack Chimney and 12 ft. (3.7 m) for 1" Solid Pack Chimney.
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The chimney must extend at least 3 ft. (92 cm) above its point of contact with the roof and at least 2 ft.
(61 cm) higher than any wall, roof or building within 10 ft. (3.1 m) of it. See the figures on point 11
bellow to determine the configuration that applies to your roof (flat or sloped roof and the distance
between the chimney and the highest point of the roof and/or the nearest chimney).
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Deviations should be avoided whenever possible, especially the most pronounced. Each deviation adds
some restriction to the chimney system and may lead to draft problems.
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To insure a good draft, it is recommended to have a length of 18” (457mm) from the top of the unit to
the furthest offset. However, starting using a 30° or 45° (Canada Only) elbow is also approved.
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If the chimney extends higher than 5 ft. (1.5 m) above its point of contact with the roof, it must be
secured using a roof brace.
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A rain cap must be installed on top of the chimney.
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Cut and frame square holes in all floors, ceilings, and roof that the chimney will go through to provide a
2" (50 mm) minimum clearance between the chimney and any combustible materials. Do not fill this 2
″
space with insulation or any other combustible material.
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Portions of the chimney which may extend through accessible spaces must be enclosed to avoid
contact with combustible materials or damage the chimney.
