& P2 f' E* Z2 U# f4 F5 K# _+ DThis 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! ( ]+ _3 c, U h0 F* Q- y- }2 x& `# V 1 b7 [: |" d8 lThese kinds of device need be cleaning and maintaining before winter season.