FRESH AIR FOR COMBUSTION AND VENTILATION
Continued
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two permanent openings: one within 12" of the ceiling and one within 12" of the floor. Connect these items directly to the outdoors or spaces open to the outdoors. These spaces include attics and crawl spaces.
IMPORTANT: Do not provide openings for inlet or outlet air into attic if attic has a
Ventilated
Outlet Attic
Air
Outlet |
|
Air | To Attic |
|
To
Crawl
Space
Inlet
Air
Inlet Air |
| Ventilated |
|
| Crawl Space |
|
|
Figure 3 - Ventilation Air from Outdoors
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