Spiral Silencers

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	Motor Silencer    This application of an Oxel Spiral Silencer on a 400-hp TEFC motor, reduced the noise by approximately 27 dbA.  The pressure drop across the silencer is so low as to only result in a temperature increase of approximately 1-deg. F.     These silencers are manufactured by Innovative Metal Industries, Inc. They have been applied to large and small TEFC motors in a wide variety of industries including severe duty areas like petro-chemical plants.
	Motor Air Intake Silencer    The use of Oxel Spiral Silencers on these 800-hp TEFC pump motors, reduced the noise in the adjacent Control Room by 24 dbA.  These units are for a gasoline and oil pipeline installation.
	Motor Air Exhaust Silencer    The exhaust air silencers for these 800-hp TEFC pump motors helped lower the noise in a nearby office trailer. Note the Before/After pictures.    The "Before" picture clearly shows the annular ring where the air is exhausted.    As can be seen in the "After" picture below, the silencer was split horizontally to allow access to the coupling without requiring complete removal of the silencer.  The Oxel silencers are designed for minimal pressure drop.  This is critical for motor silencers where the motor fan would not provide adequate cooling if the pressure drop was too high.
	Blower Exhaust Silencers    A metallurgical products manufacturer had complaints from neighbors across from their plant, due to the exhausts of two process blowers.  This picture shows the first of two silencers installed that reduced the noise levels at the Property Line by 22 dbA. Due to the comparative light weight of Oxel silencers, no other structural support was required.  The acoustically treated cap provides added noise reduction and protection from the elements.
	Multiple Inline Silencer    This is an Oxel Dual-in-Line spiral silencer during the manufacturing process.  It incorporates two spiral silencers with an air-gap between, in the direction of air flow.  This notably increases the noise reduction (Insertion Loss).  They have even been produced as a Triple-in-Line where extremely high Insertion Loss was required and space was at a premium.  A 10' - 12' long baffle type silencer would be required to provide the same acoustical performance.  It would also impart a much higher pressure drop than the Oxel silencer.  This unit was split into (4) sections to facilitate the field installation.

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