An air handling heat exchanger humidifying apparatus (1) is provided with a humidifying cell (13) of a self supporting sheet like body with closely spaced air openings therein. Air is moved through the apparatus (1) so it passes through the openings in the humidifying cell (13). A humidifying liquid is deposited onto the body surfaces of the cell between adjacent openings. As the air moves through the openings it collects the humidifying liquid from the surfaces of the cell (13). The humidifying liquid can be cooled. The air then exits the apparatus (1) and can be used for cooling produce or other product. The cell (13) can be an expanded mesh with the openings having a somewhat diamond shape. The cell (13) body can be corrugated to assist in humidifying liquid retention.