Incorporating any of PalmSHIELD's solid panel infill with state of the art mass loaded vinyl noise barrier and Acoustical Surfaces Inc.® Silk metal box design to allow air flow for maximum noise reduction. The Noise S.T.O.P. Mass Loaded Vinyl Sound Barrier is a high-density exterior rated barrier.The silk metal micro perforated metal is offset from the solid architectural panel and vented at the bottom to allow air flow and maximize the silk metals performance.