Empire Comfort Systems DVLT series Installation Instructions And Owner's Manual page 20

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EXAMPLE
If total vertical is to be 9', then the maximum required horizontal
run can be 14'
H=20' - (45° + 45°) = 14' (equivalent horizontal)
From the graph the required vertical is 14'.
Figure 33 - (DV(LT,TT)42)
Page 20
EXAMPLES - VENT RUN
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