H2D closed loop filter/vent mounting

This is a mounting that adds a pair of 2 inch diameter ports to the back of your H2D. One of them is an exhaust port that connects to the rear exhaust grille of the H2D. The other ducts back to the poop shoot. This way, if you attach an exhaust hose to the exhaust port that pulls air, a negative pressure will be created in the enclosure and a small air current blowing up the poop shoot results. This is useful since you can attach a closed loop filter so that your warm air cycles back around and reenters the printer. Helping keep the enclosure temperature stable even when the printer is in a very cold room (e.g. an unconditioned basement in the winter). To mount this you would pop off the top fin of the rear port and then screw the attachment into it. The fin comes off easily if you pull on it, no tools are required to get it off. The vent mounting then screws into the 4 empty screw holes on the back of the H2D that are at the corners of the exhaust port. So it would look like this just