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