{HEAD ~ A pair} of spaced apart radio frequency shielding continuous screens span each window opening and are supported by {TAIL ~ the window unit frame} 
are supported by
{ HEAD ~ A pair } of spaced apart radio frequency shielding continuous screens span each window opening and are supported by { TAIL ~ the window unit frame }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL