... top of the module, and exhausts filtered clean air vertically in a unidirectional(laminar) air stream at its base, is ... shapeWithout filter net, thickness of shape is 23cm, 25KG weight, application in low ceiling are also available. 4. Flexible, diversified designExcept ... materials of shell.5. Concerning, convenient designPedals are designed in the body, which makes it convenient to install and repair ...