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 
water heater or nearby for future reference.
 

 

Combustion Air and Ventilation for
AppliancesLocatedinUnconnedSpaces
Unconfined Space is space whose volume is not less than

input rating of all appliances installed in that space. Rooms
communicating directly with the space in which the appliances are






may need to be provided using the methods described in Combustion

Combustion Air and Ventilation for
AppliancesLocatedinConnedSpaces
Confined Space is a space whose volume is less than

aggregate input rating of all appliances installed in that space.
A.ALLAIRFROMINSIDEBUILDINGS:
 


so that the combined volume of all spaces meets the criteria for an


determination. Each opening should have a minimum free area of





FIGURE 10.
B.ALLAIRFROMOUTDOORS:
The confined space should be provided with two permanent




communicate with the outdoors.
FIGURE 11.
 


2


FIGURE 12.
 


  
Figure 12 on page 11.
 
each opening should have a minimum free area of 1 square inch per


 

communicate with the outdoors. The opening should have a minimum

total input rating of all equipment in enclosure. See Figure 13.
FIGURE 13