Maximum Duct Length Calculator

Parameters- Input values in yellow boxes

Decreasing the design flow rate increases the acceptable duct length.
Decreasing the design flow rate increases the acceptable duct length.

Result

0 ft
"NL" = No limit on duct length for the specified system.
"X" = Specified system is not likely to achieve the design flow. Please vary the inputs to identify a compliant system.
Static Pressure (in w.g.) Air Flow (cfm) 0 20 40 60 80 100 120 140 160 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Design Conditions: X cfm, Y in w.g.