+ Q$ H' M) I9 Z' e3 N2 wThis is a horizontal furnurs mount on the top of building and intake air form outsid of building, I think you can not fix it by yourself! , n! L8 e% D- F2 D6 E5 z- p2 ` 1 Q5 Q: r6 L- w6 gThese kinds of device need be cleaning and maintaining before winter season.