HVAC Buddy®

HVAC Buddy® Duct Calc

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:
• 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:
• PVC
• Aluminum
• Galvanized Steel
• Spiral Steel
• Smooth Liner
• Fiber Liner
• Flex Duct

Duct Shapes:
• Round
• Rectangular
• 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
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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.

Accuracy:
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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.

FOR EVERYONE

Evaluating a field service problem can be challenging but with FLEETGRID the equation becomes simple. First, we've taken a devide and concor approach by splitting our user base into 3 different senarios (outlined below: for companies, for pros, for homes) and providing a downloadable on-premise app for each group. Second, we provide an off-site cloud based application that is available for everyone to take advantage of (cloud.fleetgrid.com). Lastly, we tie all of this together by syncing data between applications, the cloud, and other third party services in a seamless way.
There a couple key differences between our on-premise downloadable apps and our internet based cloud app. Our downloadable apps function offline first so that means you can get the job done off-grid. The data on them is stored encrypted so not even we can see your data. They are also real-time and peer-to-peer so there is no central authority to get in your way. Our cloud based application, while it does require an internet connection, takes advantage of big data, machine learning, and other areas where a mobile phone or other device can't handle by itself.
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FOR COMPANIES

As an admin, office staff, or employee, orchestrate service pros in the field and showcase professionalism to the end consumer.
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FOR PROS

As a service professional in the field, with the tools at hand drive repeat business and referrals by getting the job done.
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FOR HOMES

As a home owner requiring field service, communicate with the back office and check service professional's progress in the field.
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