AMCA 250-05:2005 Edition

This standard was developed in response to the need for a standard method of testing jet tunnel fans, sometimes called impulse fans, which have seen increasing use in the United States.

The need for adequate ventilation to maintain or improve the quality of air in vehicular tunnels is self-evident. One means of achieving such ventilation is through the use of fans located above the traffic pattern and spaced at intervals along the length of a tunnel. These fans produce a jet (or impulse) of air that induces airflow through the entire tunnel.

Secondarily, this means of achieving airflow is also useful in smoke evacuation.

The test procedures outlined in this standard are in harmony.

This standard deals with the determination of those technical characteristics needed to describe all aspects of the performance of jet tunnel fans. It does not cover those fans designed for ducted applications or those designed solely for air circulation, e.g., ceiling fans and table fans.

The test procedures described relate to laboratory conditions. The measurement of performance under in-situ conditions is not included.