Which is better? Forward or reverse running?
Depending on the blade position and direction of rotation of the fan, it is referred to as forward or reverse rotation or summer or winter operation. Some manufacturers also call it clockwise or counterclockwise operation. Decisive for the direction of the air flow is, in addition to the direction of rotation, also the blade pitch.
In reverse, winter or left-hand rotation
In winter, the airflow is directed to the ceiling and flows ümt over the walls backück to the fan. In the occupied area, the air velocity is very low and hardly noticeable.
In forward, summer or right-hand rotation
In summer, the airflow is directed directly downward. This makes the air velocity in the occupied area higher and provides cooling for the user.
But beware: in winter, the shown reversce running can remain without effect. Namely, when the ceiling is high (about from 2.80 meters). The air flows over the ceiling along the walls in the direction of the floor. Since air loses speed quickly when unguided, the kinetic energy is no longer sufficient to bring the air to the floor. It flows back under the fan in the middle of the room, where a negative pressure prevails. The lower third of the room volume is not pressurized - but that is where the heat is needed! Therefore, one works here in the so-called forward run, which then, finely dosed by means of regulator or transformer, brings the air to the floor without drafts.
In which direction the air is mixed, is für the effect irrelevant. Only the air velocity at the body of the people who are in the room must be kept low to avoid drafts.