There is no good or bad difference between hanging fans on the beams at home. Hanging fans on beams is a decorative method in geomantic omen, which can play a decorative role. But it should be noted that when hanging the fan on the beam, pay attention to the direction and position of the fan, and don't blow it at people to avoid catching a cold.
In addition, when hanging fans on the beam, pay attention to the size and quantity of fans, not too many, so as not to affect indoor ventilation.
In a word, hanging fans on the beams at home is a decorative method, but it should be noted that some taboos in Feng Shui should be observed so as not to affect health.