In one preferred embodiment, an air blast is directed through the porosity created by tensioning {TAIL ~ the fabric} to impinge upon {HEAD ~ the underlying layer} of fabric 
In one preferred embodiment , an air blast is directed through the porosity created by tensioning { TAIL ~ the fabric } to impinge upon { HEAD ~ the underlying layer } of fabric
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH