4. THE
CHIMNEY
4.1
CHIMNEY INSTALLATION NOTES
1. If possible, install an interior chimney as it will provide better performance. In areas with
continuous temperatures below
−
18
°
C (0
°
F), the use of an exterior chimney increases the
likelihood of operating problems such as low draught, high rate of creosoting, and poor
start-up characteristics. Exterior chimneys are also prone to down-drafting and flow
reversal. Installations, which are located on lower floors in the house, such as in a
basement, in combination with outside chimney, are especially prone to flow reversal.
2. The
OSBURN
STRATFORD
is listed only with chimney systems described in table 2.
3. A chimney venting a fireplace shall not vent any other appliance.
4. The minimum chimney height is 15 ft. (4.6 m).
5. 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, 12 ft. (3.7 m) for 1" Solid Pack Chimney, and 26 ft. (8 m) for AC
Triple Wall Chimney.
6. The chimney must extend at least 3 ft. (1 m) above its point of contact with the roof and at
least 2 ft. (0.6 m) higher than any wall, roof or building within 10 ft. (3 m) of it (Figure
21).
7. 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.
8. A rain cap must be installed on top of the
chimney. Failure to install a rain cap may
cause corrosion problems.
9. Cut and frame square holes in all floors,
ceilings, and roof that the chimney will go
through to provide a 2" (50 mm)
clearance between the chimney and any
combustible materials. Do not fill this 2
″
space with insulation or any other
combustible material.
10.
Portions of the chimney which may
extend through accessible spaces must be
enclosed to avoid contact with
combustible materials or damage the
chimney.
3' MIN.
10'
2' MIN.
Figure 22
23
