Normal
Also depends on the riser cable. V4 will have a adt riser cable which is shorter than the Lian-li one so no excess cable so you should be quite safe with the fan. This cable it compatible with the previous dan-a4 revisions and can be bought separatly. Though, the v3 and before are not meant to have a fan there, it should be possible. Using a descent fan curve, you can keep it quite silent too without a low noise adapter.The V4 has a slightly risen mobo position helping the placement of the fan but with the right riser cable and cable management, it should be possible to get a fan in previous revisions.Low airflow is still better than no airflow at all. Certainly if you are running watercooled and the motherboard has no additional airflow like when you run on air.
Also depends on the riser cable. V4 will have a adt riser cable which is shorter than the Lian-li one so no excess cable so you should be quite safe with the fan. This cable it compatible with the previous dan-a4 revisions and can be bought separatly. Though, the v3 and before are not meant to have a fan there, it should be possible. Using a descent fan curve, you can keep it quite silent too without a low noise adapter.
The V4 has a slightly risen mobo position helping the placement of the fan but with the right riser cable and cable management, it should be possible to get a fan in previous revisions.
Low airflow is still better than no airflow at all. Certainly if you are running watercooled and the motherboard has no additional airflow like when you run on air.