Triangle 43 x 43 Fan Housing-Mounted Double Panel Exhaust Shutter for 42 Inch PFG, VI, V, RV, RVI, VID Series

The Triangle IWSD39 Industrial Exhaust Shutter is a heavy-duty double-panel gravity exhaust shutter designed for industrial ventilation applications where reliable airflow control and backdraft prevention are required. With a nominal size of 43" × 43”. This shutter is intended for use with compatible industrial exhaust fans and wall-mounted ventilation systems.

The IWSD39 features a welded galvanized steel frame and extruded aluminum shutter blades, providing durability and long service life in demanding commercial, industrial, and agricultural environments. The double-panel design allows smooth operation on larger openings, with blades that open automatically under airflow and close by gravity when the fan is not operating.