... (1)fresh air ventilator description fresh air ventilator description 1,structural style: B-plate, Z-rotator, R-heat tube2,Performance : Q- total heat exchanger, X ... : XHBQ-D10T means: fresh air ventilator, exchanger structural style:plate,Performance : total heat exchanger, Installation form: celling, Operation Mode: multi-velocity, fresh air volume: 1000m3/h.