Just something I came up with…
So they say to disconnect the exhaust tube from the vent or the GF. I converted my Garage into a my space so I vented my GF through the wall using a dryer vent I got at Home Depot. So to avoid any dust or other things getting inside the GF I made a cover.
The cover has two pieces the smaller one fits inside the exhaust port and the outer one is so that it can be removed of course.
The outer cover measures 4 inches and the inner cover measures 3.610 it fits sung but not so tight you can’t remove it easily.