By fan do you mean the fan in the PSU?
It should just be sat flat on the floor of the case so it just points out towards the outside of the case. The main use of the fan is to blow the hot air out of the PSU to keep it as cool as possible.
It should just be sat flat on the floor of the case so it just points out towards the outside of the case. The main use of the fan is to blow the hot air out of the PSU to keep it as cool as possible.