... our air condition indoors,make us a comfortable environment.Also,when used in a workshop or a storeroom,they can improve the working environment and ... ,600,400,300,200,100.WF-800 are specially used in the machinery factory,paper factory,storerooms,and the big buildings ... and the temperature is very high; WF-500 are used in the general industries rooms and the small buildings; WF-300 ...