Duct Heaters: Standard & Finned Tubular – Pressure Drop VS Air Velocity

Use graph (English or Metric) to plot Pressure Drop vs. Air Velocity for standard duct heater sizes used to properly Size Blowers.

Air Velocity equation

Air Velocity (feet per minute)

English

Pressure Drop vs. Air Velocity Graph (English)
Approximate Pressure Drop (inches of water)

Air Velocity (meters per minute)

Metric

Pressure Drop vs. Air Velocity Graph (Metric)

Excel Automation Inc.