In order to investigate convective heat transfer in buildings, a full-scale experimental facility was developed with several unique features - 53 individually controllable heated panels that allow the room surfaces to be near isothermal, thus minimising radiation, the capability of using two different inlets, a ventilation system capable of providing temperature-controlled air at flow rates between 2 and 100 air changes per hour (ach), and an air speed and temperature measurement system. Describes the design, development, and capabilities of this facility. A companion paper presents results, obtained with the facility, for high ventilative flow rates.

KEYWORDS: Heat flow, buildings, convection, testing, measuring, experiment, ventilation, USA, air change rate.