The 411008 gravity damper features a galvanized 2" deep frame with aluminum fins/blades.The outer dimensions are 8" x 8". A damper provides effective backdraft protection and is easy to install. It is for use with horizontal mount exhaust application and is spring assisted, allowing the blades to open quickly. The leading edge of the louvers have a felt seal for quiet closing.
An optional motor kit (411611) is available but is not for use in explosive or flammable areas or airflows. You cannot use a damper in a grease application.
The 411008 is for use with the size 7 CWD Exhauster.