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The Heat Loss app has been updated, adding a function has been added to insert rooms from an image file with a schedule.
13.06.2026
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A version of the HVAC Calculator has been created for mobile browsers on Android and iOS.
09.01.2026
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All online applications have been updated and now have a dark theme.
04.01.2026
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Aerodynamic calculation is the main calculation when designing ventilation; only after its completion the dimensions of the ducts can be determined, the AHU selected, and a specification drawn up.

This application can help you to perform an aerodynamic calculation, draw an isometric ventilation diagram and obtain a specification.
Specification
Get specifications for materials and equipment.
Losses coefficients
Losses coefficients calculated according to ASHRAE and Fläkt Veloduct 1997.
Automatic size calculation
Perform automatic duct sizing.
User-friendly calculation tools
  • Get pressure drop, air flow and velocity.
  • Get the estimated direction of the ventilation network.
  • Draw isometric scheme of ventilation systems.
  • Add, copy, edit, remove or move systems.
  • Use a large set of system elements.
  • Use various settings for the calculation and drawing of the scheme.
  • Get a table of aerodynamic calculation and systems.
  • Save the table of aerodynamic calculation, systems to an Excel file.
Video review
Just watch video and start working.