U.S. Environmental Protection Agency model for predicting indoor air quality and exposure in multi-zone residential locations. Contains embedded empirical data inputs on air flows between rooms.

A study of multifamily buildings that produced valuable data on inter-unit air flows. From the website: "This project included in-depth owner interviews, a survey of a large sample of renters, legal research and measurements of the movement of PFTs and SHS tracers between units in apartment buildings before and after air sealing and ventilation treatments. The project produced some of the most extensive multiple fan measurements of inter-apartment air leakage and multiple tracer gas measurements of inter-apartment air transfer. It also developed a new metric of 'effective contaminant transfer' which is used to define the magnitude of the transfer of a contaminant source to the monitored location."

The Indoor Environment Department (IED) at Lawrence Berkeley National Laboratory (LBL) in Berkeley, CA (USA) is a world class research group in indoor air pollution, pollutant dynamics, pollutant dispersion, ventilation, and air flow modeling. One of the lab's main goals is "...understanding human exposures to environmental pollutants found in indoor and outdoor air." Many of the IED's publications are available for download

OpenFOAM is a sophisticated open-source framework for performing computational fluid dynamics (CFD) simulations.

From the website: "The OpenFOAM (Open Field Operation and Manipulation) CFD Toolbox can simulate anything from complex fluid flows involving chemical reactions, turbulence and heat transfer, to solid dynamics, electromagnetics and the pricing of financial options. OpenFOAM is produced by OpenCFD Ltd, is freely available and open source, licensed under the GNU General Public Licence."

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."