Hope none of our transmitter blowers does what that fan did in the film clip!Could be really DESTRUCTIVE!!On one of the types of blowers we use-has a 5Ft propellor(looks more like something off a boat)the blades are half in thick alunimum turned by a 15hp motor.We start these blowers at the tranmsmiter the fan themselves are in blower rooms on each side of the building.the other fans are really large squirrel cage ones.again 15 hp motors.Sometimes I have to grease these blowers and motors.they cool the tube water radiators.