Air control mechanism having noise suppression means

Details Air control mechanism having noise suppression means Air control mechanism having noise suppression means

F - Mech Eng,Light,Heat,Weapons

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L

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F23L 13/08 (2006.01) F24F 13/15 (2006.01) F24F 13/24 (2006.01)

Patent

CA 1146398

AIR CONTROL MECHANISM HAVING NOISE SUPPRESSION MEANS ABSTRACT OF THE DISCLOSURE The invention provides an airflow control mechanism for use in an air duct for controlling airflow through the duct. The air flow control mechanism includes a frame positionable in the duct, and a plurality of blades supported by the frame and extending transverse- ly to the direction of the air flow through the air duct. At least one of the blades is supported for pivotal movement about its longitudinal axis and has an elongated edge moveable toward and away from an elong- ated edge of another of the blades to restrict air flow through the duct. A fiber material strip is applied to at least one of those edges, the fiber material strip including a substrate bonded to that edge and a plural- ity of closely spaced fibers projecting transversely from the substrate, the fiber covering being functional to prevent the generation of a high frequency standing wave between the adjacent surfaces of the blade.

335841

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