A mechanical device that moves air, used in ventilation, drying, or industrial processes. 送風機 is the standard technical term.
The factory uses a large blower for ventilation.
This blower is essential for the drying process.
換気扇 is a ventilation fan installed in walls or ceilings; 送風機 can be portable or part of larger equipment.
Compound of 送風 (sending air) + 機 (machine).