; a) [- ^5 a! T7 w. R0 r7 y! k( ~This 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! . t( K$ ]! A9 f& |5 j- k! w. A5 D5 f' G# L* a+ N: V
These kinds of device need be cleaning and maintaining before winter season.