Hey guys, I've been through one grow and now I am working out a few kinks in my second grow. So, I grow inside a stand up shower and vent through my bathroom's air vent. The rub is, my 6 inch tubing doesn't squarely. Fit the ~7 inch hole in my ceiling. I have used duct tape to keep it up, but it blows with such intensity that the tape peels off over time causing heat spikes in my grow room. What I need to do is secure and seal the ducting to my ceiling hole. Any thoughts?