OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
OUTSIDE COMBUSTION AIR RECOMMENDATIONS (CONTINUED)
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 and 27 for methods of installing the outside air for combustion assemblies.
2.The combustion air assembly should be located at an exterior location, which is not likely to be accidentally 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 combustible 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.
|
| TERMINATION CAP |
FIGURE 27 | PLATE |
|
|
| |
| BASEMENT | FIRESTOP SPACER |
|
| |
| WALL |
|
ABOVE |
|
|
SNOW |
| CAUTION:DO NOT TAKE |
LEVEL |
| COMBUSTION AIR FROM |
|
| ATTIC SPACE OR GARAGE. |
|
| INLET GRILLE |
|
| 8' MAX. IN SOFFIT |
|
| (OVERHANG) |
GROUND
LEVEL
CONCRETE SLAB INSTALLATION (OPTIONAL OUTSIDE AIR RUNS)
BASEMENT INSTALLATION
DUCT EXTENDED TO MISS JOIST
SECOND FLOOR
OUTSIDE | INSIDE |
WALL | WALL |
FIRESTOP SPACER
45˚ CORNER
INSTALLATION
ON SLAB FLOOR
(ONE WALL,
INSIDE ROOM)
TO OUTSIDE WALL 
INSTALLATION ABOVE BASEMENT
OR CRAWL SPACE
23
53D9031. Rev 1 03/03