high velocity industrial wall fan,600mm/750mm,3-speed,all metal construction,with UL/NOM/CE/GS/CUL certification. *high velocity wall fan ,3 rectangle leaves blades.*metal construction,automatic protection for motor overheating.*adjustable tilt blowing angle,2-speed blowing control.*oscillating brackets arm.*600mm and 750mm is avaiable.*with UL/NOM/CE/GS/CUL certification