The DURAFIRE^® DD 120 and 240 Shutter is ideal for incorporation into industrial fire protection systems, particularly where conveyor belts penetrate compartment walls. The design of the DURAFIRE^® DD 240 Shutter allows the manufacture of a variety of configurations, both dropping and rising to close, dependent on the application. All shutters are supplied with a counterbalance system to ensure a controlled closure. If required, fusible links and electro-magnetic devices can be incorporated in the design to provide failsafe operation.