HVAC Buddy® Duct Calc

【免費商業App】HVAC Buddy® Duct Calc-APP點子

The best and number one selling duct sizing tool for Android devices with thousands of happy users. For less than the cost of a cardboard wheel ductulator always have a fast, accurate way to analyze ducts for design (by Airflow) or existing installations (by Size).

Airflow Tab

• Calc decimal & rounded sizes for any aspect ratio

• Solve for Volume, Aspect Ratio, Friction, or Velocity

Size Tab

• Calc Friction and Velocity given duct size

Settings Tab:

【免費商業App】HVAC Buddy® Duct Calc-APP點子

• Enter various units - Airflow (cfm, m3/s, l/s, m3/hr) Friction (in/100', Pa/30m), Duct Sizing (in, cm), Velocity (ft/min, m/s)

• Define standard air - Altitude (ft, meter), Temperature (Fahrenheit, Celsius), Relative Humidity (pct)

• Displays calculated Kinematic Viscosity (ft2/s) and Specific Volume (ft3/lb)

Material Types:


【免費商業App】HVAC Buddy® Duct Calc-APP點子

• Aluminum

• Galvanized Steel

• Spiral Steel

• Smooth Liner

【免費商業App】HVAC Buddy® Duct Calc-APP點子

• Fiber Liner

• Flex Duct

Duct Shapes:

• Round

• Rectangular

【免費商業App】HVAC Buddy® Duct Calc-APP點子

• Oval

Duct Sizing

• Round to Even Units

• Round to Odd Units

Calculations are based on friction loss equations in the ASHRAE Handbook of Fundamentals 2009.

Review Notes


【免費商業App】HVAC Buddy® Duct Calc-APP點子

A 12x12 duct matches FPM and CFM when friction is ignored which does not happen in real life. This relationship changes based on the properties of air (see kinematic viscosity on the settings tab) and on the friction value determined via the type of duct selected. Also, for the times when you want to get friction given CFM and Duct use the "Airflow" tab, select the "ft/min" checkbox and move the slider accordingly. There are many ways to drive the open variable.



Calculations have been verified against ASHRAE fundamentals and several other references. There are more input criteria (such as duct material) than velocity, friction, and size mentioned in the review which the reviewer may not have taken into consideration. Use the Support email link for any questions or concerns.

About Powertrade


【免費商業App】HVAC Buddy® Duct Calc-APP點子

Powertrade is the number one developer of mobile HVAC apps with professional looking, proven apps in the hands of over 20,000 users worldwide.

Powertrade HVAC Buddy® Applications:



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HVAC Buddy® Pressure Temperature - Traditional PT Chart with 71 Refrigerants in Metric or Imperial units

【免費商業App】HVAC Buddy® Duct Calc-APP點子

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