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