{TAIL ~ The screening device} is oriented below {HEAD ~ the distribution header vent} so that floating hard body cleaning elements which impact the screen, float upward into the vent and over a weir provided in the vent 
{ TAIL ~ The screening device } is oriented below { HEAD ~ the distribution header vent } so that floating hard body cleaning elements which impact the screen , float upward into the vent and over a weir provided in the vent
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH