The NMS2 Backdraft damper has a 2" steel frame and neoprene fiberglass blades. It features:- 60% free area.
- Exceptional strength and tear resistance.
- Resistance to moisture, mildew, and rot as well as to most oils, chemicals and grease.
- Quiet operation with no metallic noises.
- Fire resistance through fire retardant, non-combustible coating.
- Long, dependable operation with no mechanical pivots.
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