💨 Commercial HVAC Duct Friction Loss, Velocity & Fan Sizing

HVAC Duct CFM & External Static Pressure Calculator

Size rectangular sheet metal and spiral round ductwork based on total cooling CFM, air velocity (FPM), friction rate per 100 ft (inches water gauge), and calculate total blower fan external static pressure (ESP) for commercial HVAC installations.

1. Project & Operating Inputs

Total System Airflow Volume Required (CFM)

Design Air Velocity in Main Trunk (Feet / Min - FPM)

Total Equivalent Duct Length (Linear Feet)

Fabricated Sheet Metal Duct & Damper Install Cost ($)

2. Financial Breakdown & Yield

COMMERCIAL DUCT SIZING & FAN ESP

Annual Fan Power Cost

Static Pressure Efficiency

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost