[Nocomplaints1977]

Dump = to throw away or discard garbage, refuse, etc.

Recirculate = to move in a circle or circuit; move or pass through a circuit back to the starting point.

Whilst I understand what The Hitcher is eluding to, that they are techincally similar objects, one venting to atmosphere and the other back into the air charge circuit it would be a misnomer to call either one or the other by the incorrect term or to compare the two since they do two completely different jobs.