The black tape is 1mm neoprene gasket tape which I used to help seal between the filter body and the carbon tray, and avoid leaks, which seems to be working well. I did not detect any leaks around the body of the filter so all the air seems to be moving through the HEPA (and I can feel the airflow though it also).
The funnel like thing in the 1st pic is an adapter for a CPAP hose, which, when connected still has some mild suction at the end of the hose - though the hose is over a meter long and will be cut down in the final application. I am still not sure if I will use the hose, but want to try it out as a point filter. I should have some pics of this installed and set up soon.