LOW NOISE AIR CIRCULATION DEVICE
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United States of America Patent
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Issued Date -
Jun 25, 2015
app pub date -
Dec 4, 2014
filing date -
Dec 19, 2013
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Abstract
An air warmer has a housing whereinto is positioned a noise reduction mechanism having a casing that encases a sound reducing structure having a maze like cavity. An axial fan is positioned within the sound reducing structure. In operation, air is drawn into the sound reducing structure by the fan along a first tortuous passage. The air is directed by the fan through another tortuous passage to an air outlet to inflate a convective blanket with an air hose connected to the air outlet. The configuration of the maze like cavity and the material from which the nosie reducing structure is formed reduce the noise generated by the fan. A heater is provided proximate to the air outlet to heat the output air. A filter is provided at the air inlet to filter the ambient air drawn into the warmer.
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