
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Page 18
DIRECT VENT COLINEAR VENT EXAMPLES
Max Vent Run - 40 ft. Equivalent With Three three 90° Elbows
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off back of the fireplace, when within 6” (15.2 cm), do not con-
tribute to the overall vent length measurement. For each 45°
elbow installed in the run, the length of the run MUST be re-
duced by 1.5 feet (45 cm). Reduce the length of the run 3 feet
(91.4 cm) for every 90° elbow.
Figure 14
Calculation example of vent run maximum 40 feet
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Figure 15
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