MHSC SSTB11 Installation, Operation And Maintenance Manual page 20

SSTB11 Woodburning Fireplace
Outside Combustion Air Recommendations
1. Extremely long runs and numerous turns in the duct leading from the fireplace to the combustion air
assembly should be avoided. These conditions will increase the resistance to the free flow of air
through the duct. Refer to Figures 1, 24, and 25 for methods of installing the outside air for combus-
tion assemblies.
2. The combustion air assembly should be located at an exterior location, which is not likely to be ac-
cidentally blocked in any manner. The assembly should be located above the snow line to prevent
blockage by snow accumulation.
3. The combustion air inlet assembly should never be mounted in a garage or storage area where com-
bustible fumes such as gasoline might be drawn into the fireplace.
4. Combustion air can be drawn from the crawl space under a house when an adequate supply of air
is provided by open ventilation.
5. Do not take combustion air from attic space or garage space.
Figure 26
6" Diameter Hole
Duct
Extending
3" min.
AK4 Inlet Air Vent
Installing Model 403 Duct Connector
1. Push insulation back approximately 2" from the end of each duct.
2. Slip each duct over duct connector until an equal length of connector extends into each duct.
3. Place duck clamp over the end of each duct. Tighten duct clamp down snuggly.
4. Push insulation back into place and over duct clamp.
1 2
Loop Disengaged Slip Band
Clamp Around Through
Duct Housing
Band
20
OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
Screw
2"
App.
Screw
3
Snap Screw
Down and
Tighten
FP1906
FP1906
Duct connector
(continued)
Figure 27
Outside Air Control Lever
(Lift to Open, Pull Down
to Close)
Nail
Holes
Screws
Figure 28
Duct Connector
FP1907
FP2188
Approximately
2"
Duct Clamp
Insulation
87D0174