Automatic opening and shutting type folding fan that is non- fixed frame for plastic tunnels

PURPOSE : An automatic opening and shutting typed folding fan that is non- fixed frame for plastic tunnels is provided which is simple in construction and conveniently installed and removed and reduces installation and heating costs. CONSTITUTION : An automatic opening and shutting typed folding fan that is non- fixed frame for plastic tunnels comprises : a drive motor(4) attached with a normal/reverse rotatable reduction gear; a tunnel shaft(3) associated with the drive motor and installed in the longitudinal direction of a tunnel; a supporter vertically fixed to the outer surface of the tunnel shaft at one end part and longer than the diameter of a tunnel(1); a supporter connecting rod for connecting the free end of the supporter; and a heat insulation cover(2) connected to the free end part of the supporter.