I'm sure it's user error. Put in a new coil and cotton and now I'm getting leaking out of the airflow. Not sure what I'm doing wrong especially since I enjoyed a week of no leaking since getting it and building for the first time. This is my first RTA. I though this was dang near leak proof through airflow because of how high it is. Doesn't too much cotton cause leaking? Frustrated but not giving up.