Combustion Air - St. Croix SCF-Revolution Installation & Operation Manual

1. Under certain conditions it is recommended that the Furnace be connected to an outside source of
combustion air to improve Furnace performance. Flexible metal hose, or rigid metal pipe,
(conduit), must be connected around (NOT INSIDE) the combustion air inlet tube (Figure 7). Be
careful not to pinch or bend the outside air pipe with too small a radius which may be terminated
flush with the outside wall but should be protected from wind and weather by a hood. Note: The
outside air pipe must terminate above the maximum snow line.
2. Outside air may be drawn from a semi-enclosed attic or crawl space or any semi-enclosed space.
Take care not to draw cold air past water pipes that may freeze.
3. Increase the outside air pipe diameter to 3" for runs over ten (10) feet and elevation over 4,000 feet.
Note: Long runs should be avoided.
4. Terminate the outside air pipe below the exhaust vent outlet.
5. 5. An open mesh screen should be placed over the outside air pipe opening to prevent birds or
rodents from nesting in the opening. Use an elbow or shield to prevent prevailing winds from
blowing directly into the outside air intake pipe. NOTE: Mesh screen should be no smaller than
one-fourth inch (1/4") by one-fourth inch (1/4").
WARNING: OUTSIDE COMBUSTION AIR IS REQUIRED FOR ALL MOBILE HOME

COMBUSTION AIR

Figure 7
INSTALLATIONS!
SCF-Revolution Manual
17
WARNING
USE THE AIR INTAKE
DAMPER FOR
ADJUSTING
COMBUSTION INLET
AIR ONLY! OTHER
METHODS OF
RESTRICTING OR
BLOCKING
COMBUSTION INLET
AIR ARE STRICTLY
PROHIBITED!