- WIND BAND - Galvanized sheet steel with two formed reinforcing ribs. Supported by the galvanized steel brackets. It affords protection from weather and cross winds.
- THROAT - Galvanized steel inner throat is welded to angle ring.
- EXTERNAL BRACING - Used on larger units to give extra rigidity and prevent sagging and vibration.
- DAMPER LIDS - Open automatically when fan is turned on, close automatically when fan stops.
- POSITIVE BUMPER STOPS - Adjustable neoprene tipped bumper stops assure immediate closing when fan is cut off, yet permit maximum air flow when open.
- DAMPER BEARINGS - Shutter lids turn on sintered bronze-oil bushings mounted on rust-proof rods for lifetime of resistance-free operation. Mounted outside of airstream.
- NEOPRENE BUMPER - Mounted around top of throat. It assures positive damper contact. Prevents freezing in cold weather. Dampens sound when closing.
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