A hollow chambered partition extends transversely within {HEAD ~ the housing} between {TAIL ~ the units} and is attached to the side walls and top wall but spaced from the bottom wall 
between
A hollow chambered partition extends transversely within { HEAD ~ the housing } between { TAIL ~ the units } and is attached to the side walls and top wall but spaced from the bottom wall
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH