Crown Boiler BSI172 Installation Instructions Manual page 7

Bsi series, gas-fired natural draft steam boilers
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FIGURE 3: BOILER INSTALLED IN CONFINED SPACE,
ALL AIR FROM INSIDE
FIGURE 4: ALL AIR FROM OUTDOORS,
VENTILATED CRAWL SPACE AND ATTIC
FIGURE 5: ALL AIR FROM OUTDOORS,
VIA VENTILATED ATTIC
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