BIM (Building Information Modelling) has drastically changed how construction documents are generated. The major values of utilising BIM are seen in improved productivity, increased quality and better overall project results.


In the UK, the primary BIM software for MEP (Mechanical Electrical & Plumbing) design is Revit. To complete a BIM model of a building, all components of the HVAC system, including noise control elements such as attenuators, need to be modelled inside Revit.

BIM (Building Information Modelling)
Issues: Resources and Efficiency

Out of all the members contributing to the construction of a building, the M&E consultants are the most likely to need additional resources to realise the increased value represented by BIM.


The most labour-intensive is the development of Revit compatible parametric models for each component in the HVAC system. These are required, without exception, to finish the design.


For many HVAC components, BIM models are either not available or are only available in a basic format. This means that consultants are required to create their own component models.


There are some noise control BIM models available, but they are not easy to use. They don’t fall into place or resize themselves to suit the ductwork, leaving the consultant responsible to make corrections to what is available.


Basic attenuator models do not contain enough performance information for proper scheduling (pressure drop, dynamic insertion loss, etc.) and specification purposes. It is the design engineer that has to take extra time to create the schedule.

Comprehensive, Easy-to-Obtain Information

Our Revit families coupled with our service will save the engineer an average of 20 hours per project. All  attenuator models are easy to use and the attenuator families contain all construction and performance information, including dynamic insertion loss and pressure drop, and ‘fall’ into place within the consultant’s ducting model without adjusting or repositioning. We make it easy for the consulting engineer to schedule noise control. All of our models are supplied with an attenuator schedule template that automatically draws the necessary information from all the attenuators in the consultant’s HVAC model and develops a schedule.


Performance information, currently only provided by NSL, helps the consultant provide the owner with the necessary information for analysis or replacement purposes after building erection. This service saves engineers from having to search through files after the fact by providing the required information in the BIM model—right from the start.