For a given source pressure, {HEAD ~ the loose fill insulation} has {TAIL ~ a characteristic pressure drop} for a given density 
has
For a given source pressure , { HEAD ~ the loose fill insulation } has { TAIL ~ a characteristic pressure drop } for a given density
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH