Abstract: A humidifier (10) is provided which includes a body (16) defining a plenum (32) for receiving air and a quantity of water therewithin, said body (16) further presenting a tubular inlet (18) and a-tubular outlet (20), and a baffle (34) for directing the flow of air therethrough, said body (16) being integrally formed. A shelf (58) is provided adjacent the outlet (20) for minimizing the effect of waves generated by the flow of circulating air and inhibiting the discharge of water droplets through the outlet (20) which would otherwise be carried by the circulating air. The body (16) is preferably provided with a U-shaped sidewall (55) with the baffle (34) positioned between first and second sidewalls (36, 38) thereof so that the air introduced through the inlet (18) is directed in a U-shaped flow path to enhance humidification before it is exhausted through the outlet (20).