... no influence on decoration effect. fresh air ventilator---celling series(1)fresh air ventilator description fresh air ventilator description 1,structural ... - one velocity, T- multi-velocityExample: 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.