Paging @JL2G . I am getting ready to try and complete the exhaust air from the new tent. I am exhausting air from two 16 sq ft grow rooms. I already have a 4" roof vent in use for the one room. I put this dildo looking contraption together this evening. I wanted to run it past you to see what you thought before i install it. The end with the 4" reducer will be about 2 ' below the roof vent when in place. Okay at one end i have a 6"-4" reducer and attached to that is a 6" backdraft damper and to that a short piece of 6" duct attached to a 6" y connector. One run to the y connector is around 3' the other run will be closer to 10-12' in length Any thoughts?.