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Air duct net calculation

liNear Analyse Ventilation

Air duct network calculation including sound level calculation

The program supports the user in the detection of the volume flow rates. It dimensions the air duct system in consideration of previously defined basic conditions including flow-mechanical balancing and detection of fan pressure. Additionally, a detailed calculation of the sound level development for each flow path is performed on the basis of the same drawing. Inherent noise as well as absorbability in the octave bands is calculated according to VDI 2081 for all components. To that end, either a 2D drawing from the liNear Desktop or a 3D drawing from Design 3D Ventilation may serve as your basis.


liNear CAD Browser with Revit

You can use the liNear CAD Browser in combination with AutoCAD, liNear CADinside and also with Autodesk Revit. Countless manufacturer parts to use in your planning process. Intuitive handling with a direct connection to your CAD program to integrate the parts into your net.

Dynamic zeta value determination

The linear ventlation network calculation determines all zeta values using formulas or by interpolating from measurement series. And this while running the calculation, for each value, to match the current dimensions, speeds and flow rates.

Specify boundary conditions

Calculating boundary conditions such as barometric pressure, air temperature and humidity, as well as limit values for speeds can be specified to solve any specific requirement.

Sound level calculation

A detailed calculation of the sound-level development for each flow path is automatically performed. For all components, both internal sound and attenuation in the octave bands based on VDI 2081 are calculated.

Calculating in all planning and display modes

[The network can be calculated in scheme, floor planing or 3D isometric. You can choose the mode from project to project and decide which one is efficient and appropriate. The calculation always works the same way with reliable results.

Automatic and associative labeling

The calculation results are automatically written to the drawing and are updated with each modification of the calculation. Via freely configurable labeling blocks, you may control which calculation data in which planning phase are to be published with the drawing.

Interface to the liNear Building family

Adopt the data of heating load and cooling load calculation projects for flow rate determination and to take over the room geometry for accurate sound level calculation.

Visualisation of results with liNear Data-Coloring

With visual feedback of input values or calculation results an evaluation of data can quickly and easily be done. Dimensions, materials, as well as speeds, pressure loss, noise emissions, etc. perfectly illustrated by coloring of the network.

Platform independence

With liNear Analyse you optionally work on the basis of drawings from Autodesk AutoCAD, REVIT or liNear CADinside. The functions of the pipe and air duct network calculations are identical throughout the CAD platforms. No familiarization is required in this respect.

Comprehensive visualization options

With the visual feedback of input values or calculation results, a quick-and-easy evaluation of a variety of data is possible. Dimensions, materials, but also velocities, pressure losses, and many more are visualized perfectly by the respective coloring of the network.

Calculation in all planning and display modes (scheme, 2D, 3D)

In each planning stage it is possible to have the drawn network calculated by the program. With already one pipe run scheme you can determine a working hydraulic system and detailed masses for your tendering very quickly. At the other end of the scale, calculating with a three-dimensional model ensures closest proximity to the actual implementation.

Recalculation of pre-dimensioned or existing systems

More and more existing systems are refurbished, reconstructed, or upgraded. To consider these systems according to reality, dimensions may easily be fixed in section parts or for the entire network.

Navigation in the pipe network system

The direct navigation in the pipe network system is one of the unbeatable advantages of the integrated graphical network calculation. Unfavorable flow paths or section parts are displayed directly in the model. Vice versa, you can use the option to simply select an object in the network in order to edit its calculation data.

Several networks or systems in one drawing

When comprehensive projects are concerned, a drawing often contains several systems. liNear Analyse can detect them and includes these in the selection options of the calculation dialog for printout – all in one work step.

Mass determination of single building sectors or apartements

The graphical net calculations allow you to select areas of the system for mass determination, e.g. Building sectors, storeys or apartments.

Complete parts lists

With the help of the large amount of manufacturer data sets for piping and ventilation systems including all necessary components it is doable without any additional effort to export a realistic parts list with all pipes, fittings, reducers and accessories. Perfect for an offer or tender.

Freely definable pipe and insulating tables

In case your requested pipe or insulating material is not available as a data set, it may be detected easily and quickly as manufacturer-neutral material.

Automatic and associative labeling

The calculation results are automatically integrated into the drawing and are updated with each modification of the calculation. Via freely configurable labeling blocks, you can control which calculation data in which planning phase are to be published with the drawing.

Working with drawing and calculation without interfaces

Integration into the CAD program and direct access to the CAD databases ensure the highest performance. At the same time, an interface between drawing and calculation is not required any longer. Problems with data exchange are now a thing of the past.

Detailed and standardized printouts

All calculation parameters and all results are documented comprehensibly and in detail in forms and lists – optionally in different languages.


Free downloads


CAD Bibliothek für Lüftungsbauteile
inkl. SCHAKO-Luft Auslegungsprogramm

- liNear CAD Browser Version 18.03 oder höher

Letzte Änderung:
146.98 MB
Germany, International

- Luftkanalsysteme (3D-Kanalklasse)
- Lüftungsbauteile

- liNear Design 3D Ventilation 17.03 oder höher
- liNear CAD Browser Version 17.03.06 oder höher

Letzte Änderung:
568.54 MB
Germany, International

Paid downloads


- Lüftungskomponenten

Letzte Änderung:
150,00 EUR
13.52 MB