Knowledge Base Revit
Calculating Networks
Learn how to calculate pipe and duct networks.
About the Air Duct Network Calculation
Explains the concept of air duct network calculation.
Settings
Explains the concept of Settings in the Pipe and Air Duct Network Calculations.
General Settings
Explains the concept for general settings in the Pipe and Air Duct Network Calculation Ventilation.
Details on "Settings” (Ventilation)
Information about the Settings dialog in the Pipe and Air Duct Network Calculation Ventilation.
Details on “Calculation Specifications” in the "Settings” (Ventilation)
Information about the Calculation Specifications section of the Settings dialog in the Pipe and Air Duct Network Calculation Ventilation.
Details on “Velocity Limits"
Information about the Velocity Limits dialog in the Settings for the discipline Ventilation.

New Features
Learn about new features in LINEAR software.
System Requirements
Learn more about the system requirements for using the LINEAR solutions.
Supported Norms and Standards
Learn which norms and standards support the LINEAR Solutions modules.
LINEAR Installation and Administration
Learn how to install, your LINEAR software, license and keep it up to date.
Getting Started
Get basic information about the structure, function, and interaction of the LINEAR Solutions programs in Revit and LINEAR Building.
Prepare Data Environment
Learn how to import IDS files at the beginning of a BIM workflow in accordance with client information requirements and BIM execution plans and prepare an automated check of the model.
Preparing Building
Learn how architects prepare plans and models to create a building model for building analysis.
Pre-Conception Design
Learn how to plan the positionining and dimensioning of technical control centers and create the route concept in collaboration with all parties involved in the planning.
Analyzing Buildings
Get information about the demands analysis of a building with LINEAR Building. The demands analysis includes the calculation of the heat load, the cooling load and the determination of the required air volumes.
Dimensioning Components
Learn how radiators, convectors, panel heating/cooling systems and concrete core activation systems and components of ventilation systems are designed based on the requirement analysis in LINEAR Building.
Create Pipe Run Scheme
Learn how to create pipe run schemes for pipe networks in LINEAR Building.
Calculate Pipe Run Schemes
Learn how to calculate pipe run schemes in LINEAR Building.
Inserting Components
Learn how to insert components from the LINEAR CAD Browser, from the libraries and configurators of the Library tab or from LINEAR Building into a model.
Constructing Networks
Learn how to create pipe and duct networks, design slots and openings and manage discipline-related reports and tasks.
Calculating Networks
Learn how to calculate pipe and duct networks.
- Requirements for a Calculable Pipe- and Duct Network
  Explains the requirements for a calculable pipe and duct network.
- About Classification
  Explains the concept of classifying components for the Pipe and Air Duct Network Calculation.
- About Virtual Components
  Explains the concept of virtual components in pipe and duct network calculations.
- About Pipe Network Calculation Heating and Cooling
  Explains the concept of the pipe network calculation for heating and cooling.
- About Pipe Network Calculation Potable Water
  Explains the concept of pipe network calculation in potable water.
- About Pipe Network Calculation for Waste Water
  Explains the concept of pipe network calculation in waste water.
- About the Air Duct Network Calculation
  Explains the concept of air duct network calculation.
  - Settings
    Explains the concept of Settings in the Pipe and Air Duct Network Calculations.
    - General Settings
      Explains the concept for general settings in the Pipe and Air Duct Network Calculation Ventilation.
      - Making General Settings
        Shows step-by-step how to set general settings for the Pipe and Air Duct Network Calculation Ventilation.
      - Setting System types for Network Detection
        Shows step-by-step how to select system types that should be considered in the detection.
      - Detecting a Partial Pipe Network
        Shows step-by-step how to limit the detection of components and pipes or ducts for calculation to partial networks.
      - Setting Limit Values for Switching Between Round and Rectangular Ducts
        Shows step-by-step how to set limit values for switching between round and rectangular ducts during dimensioning.
      - Details on "Settings” (Ventilation)
        Information about the Settings dialog in the Pipe and Air Duct Network Calculation Ventilation.
        Details on “Component Detection” in the “Settings” (Ventilation)
        Information about the Component Detection section of the Settings dialog in the Air Duct Network Calculation.
        Details on “Calculation Specifications” in the "Settings” (Ventilation)
        Information about the Calculation Specifications section of the Settings dialog in the Pipe and Air Duct Network Calculation Ventilation.
        Details on “Velocity Limits"
        Information about the Velocity Limits dialog in the Settings for the discipline Ventilation.
        Details on "Default Zeta Values by Component Type"
        Information on the dialog Default Zeta Values by Component Type in the Zeta Values section of the Settings for the Pipe and Air Duct Network Calculationventilation.
        Medium
        Explains the concept Medium in Pipe and Air Duct Network Calculations for heating, cooling and ventilation.
        Details on "Duct Dimensions” in the "Settings” (Ventilation)
        Information about the Duct Dimensions section of the Settings dialog in the Pipe and Air Duct Network Calculation Ventilation.
    - Material Data
      Explains the concept of the material data in the duct network calculation (ventilation).
    - About Rooms
      Explains the concept of Rooms in duct network calculation.
    - Components
      Explains the concept of the Components section in Pipe and Air Duct Network Calculations.
  - Calculation
    Explains the concept of the calculation dialog in Pipe and Air Duct Network Calculations.
  - About the Calculation of Air Duct Networks with MEP-Fabrication Parts
    Explains the concept of calculating air duct networks that contain MEP fabrication parts.
- About Pipe Network Calculation for Gas
  Explains the concept of pipe network calculation gas.
Create and Edit Scheme
Get information on the workflow Scheme for the disciplines Heating and Potable Water and Cooling in Revit.
Construction Design
Get information about the workflow Construction design in connection cable trays as well as pipe and duct networks.
Labeling
Learn how to label pipe/duct sections and components in the model.
Output
Get information on the output of calculation results and material lists in your CAD program and on the output in LINEAR Building. In addition, find out how you can customize the layout of the output documents using the print mask editor.
Troubleshooting
Get information about possible sources of errors when working with LINEAR Solutions.

Details on “Velocity Limits"

Information about the Velocity Limits dialog in the Settings for the discipline Ventilation.

This dialog defines the volume flow rate intervals and their maximum permissible air velocities, which are used for the dimensioning specifications according to maximum velocities in the option by Volume Flow Rates. If necessary, you can adjust the values to suit your requirements.

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Project tab ➤ Disciplines … ➤ Ventilation ➤ Analyse tab ➤ Settings … ➤ Calculation Presettings ➤ Maximum Velocities ➤ by Volume Flow Rates

Dialog Velocity Limits in the Settings of the Ventilation Discipline of the LINEAR Solutions for Autodesk Revit

The volume flow rate limits of the intervals are defined only by the upper limits. If you change the upper limit of an interval, the lower limit of the following interval is automatically adjusted. If you do not comply with the requirements when defining the intervals, you will be notified. Use the tilde symbol (~) to set an open upper limit for the volume flow rate, which is required for the upper limit of the last volume flow rate interval.

Table 1. Table of Velocity Limits
Column	Description
Volume Flow Rate of...	Displays the lower volume flow rate limit for the respective interval.
Volume Flow Rate up to...	Sets the upper volume flow rate limit for the respective interval. The lower limit of the subsequent interval is automatically adjusted after a value is entered.
Velocity up to...	Sets the maximum permissible air velocity for the respective interval.

Reset: Resets the volume flow rates and velocity limits to the default settings.

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Details on “Velocity Limits"