1. Flue Damper
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2. Outside Air
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Outside air control handle may be warm.
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Heatilator • Birmingham BIR50-B Owner's Manual • 4059-700 • Rev U • 1/24
3. Glass Doors
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FULLY CLOSED
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Figure 3.3
Operating Positions of Bi-fold Doors
PARTLY OPEN
INCORRECT
PARTLY CLOSED
INCORRECT