Sile-X is the first flat packed silencer for centrifugal/mixed flow fan noise reduction on the market. The flat pack design allows for efficient transport of the silencer. They are easy to assemble. Use before and after centrifugal/mixed flow fans and fan noise is greatly reduced. Sile-X utilizes advanced acoustic foam and our 3 times fan/duct diameter noise reduction technique to achieve ultra-quiet fan operation. To completely silence your fan, use an oversize piece of acoustic ducting pulled over the assembled fan/silencer assembly. Noisy fans are a thing of the past with Sile-X Silencers.