The most desirable approach to noise is to reduce it at its source. Here, the addition of acoustical material can significantly reduce the noise level. With this in mind, we use foam and mineral wool internally in the dryers, and gel-coated fibreglass and stainless steel to act as barriers. Typically, porous materials absorb sound as well as moisture; therefore, we carefully researched the properties of materials which would abate noise while withstanding the harsh wash environment.