To prevent snow from being accumulated on a cooling fan, etc.

A snowbreak hood apparatus 10 is adapted to include two electrically driven shafts 12 provided oppositely on an upper portion of a fan stack 4 surrounding a cooling fan 1, and two snowbreak hoods 20 for opening and closing symmetrically left and right an upper portion of the fan stack 4 through the electrically driven shaft 12. Left side snowbreak sheet arcuate frame 17 of a predetermined number and right side snowbreak sheet arcuate frames 17 are entrained between the two electrically driven shafts 12, and a sheet 19 trained up to a left side peripheral edge 4a of the fan stack 4 is stretched to the left side snowbreak sheet arcuate frame 17, while the sheet 19 trained up to a right side peripheral edge 4b of the fan stack 4 is stretched to the right side snowbreak sheet arcuate frame 17 to construct left and right snowbreak hoods 20 and open and close the left and right snowbreak hoods 20 with the aid of driving of the electrically driven shaft 12.