4" dryer vent bypass

I made a bypass for a 4" duct to allow the humid air from the electric clothes dryer in the house during the winter and redirect it outside during the summer. The "outlet" threads are reversed to allow for the two ends to be taped in place and the box unthreaded to allow for cleaning or repair if needed. This is definitely a work in progress and the threads take a little work to get them threaded. There are spots in the corners of the "flapper" to insert magnets (1mm thick by 3mm diameter). There are corresponding spots in the box in the open and closed positions for additional magnets.

I've included the Fusion360 files as well if you want to modify for your own use.

USE AT YOUR OWN RISK. USING THE WRONG MATERIALS IN HIGH TEMPERATURE ENVIRONMENTS CAN CAUSE FIRES. ALSO, SOME CRAP ABOUT BREATHING IN COTTON FIBERS CAN KILL YOU.