Heatilator Gas Fireplace NDV3036IL Owner's Manual page 28

2. Top Vent - Vertical Termination - (continued)
Three Elbows
Figure 7.9
28
Maximum horizontal run is
100% of vertical, but cannot
exceed 26 ft (7.92 m)
12 ft (3.66 m) min.
60 ft (18.29 m) max.
Heatilator • Novus NDV Series • 4055-187 Rev F • 06/08
Note: Subtract 3 ft (914 mm) from the total horizontal
measurement for each 90° elbow installed horizontally.
Subtract 1-1/2 ft (457 mm) from the total horizontal
measurement for each 45° elbow installed horizontally.