Medium
  • Apple

    iPhone, iPad

  • Android

    Android

  • Windows

    Windows Desktop

Balancing HVAC System: Airflow Measurement Mobile App

A well performed testing, adjusting and balancing (TAB) of a HVAC system is essential for the proper performance of that system and can enhance indoor air quality and efficiency. Balancing HVAC System: Airflow Measurement mobile app was developed to assist in air balancing and air flow of air conditioning and water cooling systems to improve indoor air quality. A systematic approach is called for when balancing a HVAC air and water systems. The app includes is a general procedures that can be applied to all systems. Routine testing will improve energy efficacy. Free area defined as the total minimum area of openings in an air outlet or inlet device through which air can pass. Free area of return air or supply air grilles may be as low as 50% of the duct connection size. The free cross-sectional area of a duct normally is 100%. If other data are not available, it may be assumed that all similar return air or supply air grilles would have similar free areas when measured with the same instrument.


  • Lendlease
  • The Cooperative
  • PG&E
  • Toys R Us
  • Red Bull
  • Mirvac

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Included Features

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Included Fields

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  • Ico textbox Job Site
  • Ico multiline Location
  • Ico textbox HVAC Technician Name
  • Ico date Date
  • Ico signature Signature
  • Ico statictext CFM = cubic feet per minute
  • Ico statictext FPM = velocity in feet per minute
  • Ico statictext FT² = area in foot square
  • Ico statictext The basic airflow equation for any free area is {airflow (cfm) = area (ft²) X velocity (fpm)}
  • Ico statictext 2000 cfm = 2ft² X 1000 fpm
  • Ico statictext {area (ft²) = airflow (cfm) / velocity (fpm)}
  • Ico statictext 2ft²= 2000 cfm / 1000 fpm
  • Ico statictext {velocity (fpm) = airflow (cfm) / area (ft²)}
  • Ico statictext 1000 fpm = 2000 cfm / 2ft²
  • Ico statictext {Velocity fpm = 4005 X √ Velocity pressure}
  • Ico statictext fpm = 4005 X √ 0.
  • Ico statictext Free area defined as the total minimum area of openings in an air outlet or inlet device through which air can pass.
  • Ico statictext Airflow equation for a return air or supply air grilles
  • Ico statictext {Airflow (cfm) = area (ft²) X velocity (fpm) X % of free area}
  • Ico statictext 2250 cfm = 3 ft² X 1000 fpm X 75% free area
  • Ico statictext {% of free area = airflow (cfm) / area (ft²) X velocity (fpm)}
  • Ico statictext 75% = 2250 cfm / 3 ft² X 1000 fpm
  • Ico checkbox To accomplish repeatable traverse measurements, take the measurements in a specific, measured pattern, as indicated below.
  • Ico checkbox Duct size must not change in a traversed section.
  • Ico checkbox Face the Pitot tube into the air stream, parallel to the ductwork at each measurement point, and measure the velocity.
  • Ico checkbox Convert velocity pressure to fpm velocity before averaging if the traverse is taken at other than standard conditions.
  • Ico checkbox [Actual CFM].
  • Ico checkbox Verify that velocity measurements are acceptable.
  • ...and More!

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