This is a nicely done article for building a sound enclosure for an air compressor.
http://www.cianperez.com/Photo/Exposed/album_WoodWerx/Projects/Compressor_Enclosure/Pages/Compressor_Enclosure.htm
And this is a link to the fan used from RadioShack
http://www.radioshack.com/product/index.jsp?productId=2102825&retainProdsInSession=1
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