®
UNVENTED (VENT-FREE) LOGMATE® FIREBOX
AIR FOR COMBUSTION AND VENTILATION
Continued
VENTILATION AIR
Ventilation
Grills
Into Adjoining
Ventilation Air From Inside
Room,
Or
Option 1
Remove
Building
This fresh air would come from an adjoining unconfined space. When ventilating to an adjoining unconfined space, you must pro- vide two permanent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see option 1, Figure 3). You can also re- move door into adjoining room (see option 2, Figure 3). Follow the National Fuel Gas Code NFPA 54/ANS Z223.1, Section 5.3, Air for Combustion and Ventilation for re- quired size of ventilation grills or ducts.
Door into Adjoining Room, Option 
2
Figure 3 - Ventilation Air from Inside Building
4" 
WARNING: Rework work- sheet, adding the space of the adjoining unconfined space. The combined spaces must have enough fresh air to supply all appliances in both spaces.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation grills or ducts. You must provide two per- manent 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
| Outlet | Ventilated |
| Attic | |
| Air | |
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| |
Outlet |
|
|
Air |
| To Attic |
|
| |
|
| To |
|
| Crawl |
Inlet |
| Space |
|
| |
Air |
|
|
| Inlet Air | Ventilated |
| Crawl Space | |
|
| |
Figure 4 - Ventilation Air from Outdoors | ||
6 | 105163 |
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