Further, back pressure created on {TAIL ~ the high pressure side} of {HEAD ~ the loose fill insulation} is directly proportional to density 
Further , back pressure created on { TAIL ~ the high pressure side } of { HEAD ~ the loose fill insulation } is directly proportional to density
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH