{HEAD ~ The cap} 44 is supported in relation to the wall member 32 by a plurality of generally vertically extending flow straightening and deceleration vanes 56, each of which depend generally from the edge 33 downward and terminate at a lower edge 57 spaced from a lower edge 47 of {TAIL ~ the cap member} 44 
{ HEAD ~ The cap } 44 is supported in relation to the wall member 32 by a plurality of generally vertically extending flow straightening and deceleration vanes 56 , each of which depend generally from the edge 33 downward and terminate at a lower edge 57 spaced from a lower edge 47 of { TAIL ~ the cap member } 44
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