A.O. Smith VB/VW- 1000 Boiler User Manual


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13
AIR FROM OTHER INDOOR SPACES
FIGURE 9E.
The confined space should be provided with two permanent
openings,onecommencingwithin12inches(300mm)ofthetop
andonecommencingwithin12inches(300mm)ofthebottomof
the enclosure. See Figure 9E.
Each opening should communicate directly with an additional
room(s)ofsufcientvolumesothatthecombinedvolumeofall
spacesmeetsthecriteriaforanUnconnedSpace.
Each opening should have a minimum free area of 1 square inch
per1,000Btu/hr(1100mm
2
perkW)oftheaggregateinputrating
of all appliances installed in the enclosure. Each opening should
notbelessthan100squareinches(645cm
2
).
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