Mechanical Code…
A damper arranged to seal off airflow automatically through a part of an air duct system so as to restrict the passage of smoke and is listed to the applicable recognized standard.
(Uniform Mechanical Code® 206.0)
Building Trades Resource
Mechanical Code…
A damper arranged to seal off airflow automatically through a part of an air duct system so as to restrict the passage of smoke and is listed to the applicable recognized standard.
(Uniform Mechanical Code® 206.0)