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conVoid User Guide

08th March 2022

Video Tutorial

Installation and License


1.   Download and Installation    

Download and install conVoid for Autodesk Revit 2019, 2020, 2021, 2022, and 2023 as an admin.

  • The Plug-in is installed per machine under the following path \ProgramData\Autodesk\Revit\Addins\%year%

  • The Revit Families are installed under the following path \Documents\conclass\Revit Content\%year%\%language%

2.   License     

Start Revit and make sure you are connected to the Internet to validate your license. You will find conVoid under the Ribbon Tab [conclass]. If you don´t have a License, conVoid will automatically start the Trial-Version. Purchase a Desktop- or Floating License in our Webshop.

Floating License:

  • Internet connection required to start conVoid and validate the license

  • conVoid can be used on a certain number of machines at a time

  • Example - Company with ten employees and one Floating License: User A starts conVoid, and the license will be locked for him. User B starts conVoid and receives a message that all seats are reserved. User A closes Revit or releases the license manually. User B can now start conVoid since there is a free seat.

Desktop License:

  • Internet connection required to start conVoid and validate the license

  • conVoid can be used on one machine​

User Interface


1_User Interface_EN.PNG

#1   Convert Void    

  • Create and update automatically MEP and Structural openings

  • Transfer Parameters from the Reference Element, Host Element, and Level to the openings

#2   Manage Void

  • Coordinate and approve openings

  • Filter openings based on their status

  • Export your results as an Excel, CSV, or BCF file​

#3   Dimension Void   

  • Create a filter to set an offset for selected openings 


#4   Smart Tag 

  • Automatically annotates selected openings with a tag in a free spot in a 2D plan

#5   Info   

  • Activate your Desktop- or Floating License

  • Get the conVoid version and check for updates

#6   Join/Unjoin

  • Join openings manually into one single opening and unjoin them again

#7   Rectangular/Circular

  • Change the shape of the openings manually from circular to rectangular

#8   Level

  • Modify the level of the openings manually

Model Requirements


During the work with conVoid, there are no model requirements to consider. ConVoid supports all Revit and IFC elements of any category to create and update openings. The only thing you need is a clash between a Host-Element (e.g., a Wall) and a Reference-Element (e.g., a Duct) in your project. These can either be in your project or a linked one.



  • A clash between a Duct and a Wall

  • A clash between a Pipe and a Floor

  • A clash between an IFC Provision for Void and a Beam

  • A clash between a Door and a Wall

  • A clash between a Generic Element and a Roof

  • A clash between two Elements of your choice

1_Requirements and Installation_EN.PNG
Project Setup


Decide at the beginning in which Revit project you want to create and update your openings. You can either use your main Revit project to place openings or create a second Revit project just for the openings and link them into your main Revit project. If you work with multiple disciplines, you can also work in a coordination model.

Project Set-Up

As already mentioned, you need at least one clash between a Host-Element (e.g., a Wall) and Reference-Element (e.g., a Duct, Provision for Void, Door) to create an opening. If you are the owner of the Reference-Elements and the Host-Elements are in an external IFC- or Revit model (Architectural or Structural model), link the external model in your project. You can also link multiple external models to create openings based on both models. The same applies if you are the owner of the Host-Elements and link an external model with Reference-Elements. (MEP model or Architectural model) to create MEP openings and Structural openings. If you are the owner of the Host- and Reference-Elements, you can run conVoid directly in your project to create openings.

➞ 1. Work in your Model

Suppose multiple disciplines are involved in the opening' creation and coordination process. In that case, it´s you can create a coordination Revit project, where all participants who approve the openings are working in one model. The following workflow is a recommendation, though you can define a different process with the help of conVoid.


1.   Handover

In the beginning, the Architect and Structural Engineer hand over their models (IFC or Revit) to the MEP Engineer.

2.   Create/Update MEP Openings

The MEP-Engineer set up his Revit project as described in Chapter [Work in your model].  Based on a clash detection between Architectural-, Structural-, and MEP-Elements, conVoid creates Provision for Voids automatically.

Note: The MEP-Engineer can also use different software and plug-in than Revit and conVoid to create Provision for Voids. Using another system does not affect the process.

3.   Handover Provision for Voids

After creating the Provision for Voids (MEP Openings), the MEP-Engineer hand over the openings to the Architect and Structural Engineer as an IFC- or Revit file.

4.    Approval of Provision for Voids

The BIM-Coordinator or other project participant creates a new Revit Coordination model and links all models (Architectural, Structural, MEP, Provision for Void, etc.) in this project. The project creator has to give all participants who run the approval process access to the newly created Coordination model. One participant has to adopt the Provision for Voids to conVoid openings. After that, all participants can approve or reject the Provision for Voids.

5.   Handover Approval Results

After the approval process is done, the architect or another participant hands over the results to the MEP Engineer in a BCF- or an Excel-File. The MEP-Engineers update the rejected Provision for Voids and hand over a new version.

6.   Transfer Approved Voids

In the end, the Architect and Structural-Engineers transfer and cut the approved openings in their project with conVoid.

This workflow will continue until the end of the void creation and approval process.

➞ 2. Work in a Coordination Model
Create and Upate Openings

You can create openings in your entire model or a specific part. conVoid uses all visible elements in the active view to create openings.

1.   Create openings in a Floor- or Ceiling Plan    

If you want to create openings in a Floor- or Ceiling Plan, open a 2D View and reduce the visible area by activating the Crop-View if necessary. conVoid will now create openings based on all visible elements in the active view.

2.   Create openings in a 3D-View    

If you want to create openings in your entire model or just a part of it, open a 3D View and reduce the visible section by activating and adjusting the Section-Box. conVoid will now create openings based on the visible elements in the active view.

Example:   In our example, we have a 3D View with an active Section-Box. Only in this section scope conVoid will create and update openings.

1. Section Scope_EN.PNG
➞ 1. Section Scope of the Openings