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