My suggestion would be to not have the fan blow on the plants. Instead of pointing the fan towards the plants, point it away. If will still create the airflow you want, but you won't be stressing your plants as much. Just my 2 cents.
ilovetv247 Reviewed by ilovetv247 on . Can fans blow too hard? I'm using a 12'' fan at the moment, and I was wondering when its possible for the wind to be too strong? The fan isn't pointed directly at the plants, but when it hits the wall it moves the air around the plants and makes them shake slightly. Rating: 5