This website is run by the U. S. National Institutes of Standards and Technology (NIST) (Building and Fire Research Laboratory; Indoor Air Quality and Ventilation Group), and it is the home of the CONTAM multizone model, which runs on the Windows and GNU/Linux platforms and can be downloaded for free.

The website aims to "...foster the development and facilitate the application of multizone ventilation and indoor environmental modeling in the areas of building design, operation, maintenance, investigation and research." "....[Y]ou will find software tools for performing multizone analysis, information on the applications of multizone modeling, multizone modeling case studies, and references to multizone modeling publications."