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DUCT DESIGN
When determining the proper duct size the equivalent length for bends must be used.
90 - degree Bend (Figure 4) A 90 - degree bend has pressure drop equal to approximately twenty (20) lineal feet of flexible duct.
45 - degree Bend (Figure 5) A gradual 45 - degree bend has pressure drop equal to about ten (10) lineal feet of flexible duct.
180 - degree Offset (Figure 6) A 180 - degree offset has pressure drop equal to about forty (40) lineal feet of flexible duct.
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Figure 4
Figure 5
Figure 6
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