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24” (61 cm) MINIMUM CLEARANCE
TO COMBUSTIBLES
H1
H2
V1
Figure 28
H1
H2
V1
EXAMPLES - TOP VENT RUN
If total horizontal needs to be 8' (2.44 m), then the minimum
required vertical is 5' (1.52 m).
H=8' (+90°) = 11' (equivalent horizontal)
H=2.44 m (+90°) = 2.44 m (equivalent horizontal)
From the graph the required vertical is 5' (1.52 m).
Figure 29
If total horizontal needs to be 10' (3.05 m), then the minimum
required vertical is 7' (2.13 m).
H=10' (90° + 90°) = 16' (equivalent horizontal)
H= 3.05 m (90° + 90°) = 4.88 m (equivalent horizontal)
From the graph the required vertical is 7' (2.13 m).
