I purchased a Can 33 charcoal filter at the recommendation of my local hydro store associate. I also purchased a 6" high velocity fan at his recommendation also with some 6" ducting. I get the filter up in the corner of my tent and go to hook up the ducting but the hole of the Charcoal filter is like 12". I looked online and went to their website and in the video the guy had a gasket he was screwing into the filter. Anyone have one of these or know where I am going wrong here? Was it supposed to come with a gasket and it just wasn't in the box or what do I have to do to setup my fan to start venting my light/tent?