Dunkirk 90-50 Installation, Operation & Maintenance Manual page 22

Gas-fired, direct vent, condensing, hot water boiler
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CombusTion air and VenT pipe
figure 10a - side Wall Vent / intake terminations - less Than 12" Clearance above grade
Less Than 12" Clearance
figure 10b - side Wall Vent / intake Terminations - 12" or more Clearance above grade
12" Or More Clearance
22

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