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