In certain example embodiments, {HEAD ~ the velocity} of {TAIL ~ the air/wind} may be increased within the channel by virtue of features including, for example, retractable and directional vanes and side wall elements that help create constricting locations  
of
In certain example embodiments , { HEAD ~ the velocity } of { TAIL ~ the air / wind } may be increased within the channel by virtue of features including , for example , retractable and directional vanes and side wall elements that help create constricting locations
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH