If anyone wants my white, roof vent (non-powered), you can have it for free. You can pick it up (Roselle IL) or pay shipping if it's worth your while. You'll need to scrape the caulk off the flange. It's new. Came off my 3990 when I replaced the vent in the back bath with a powered unit with remote (It's 10' off the ground, how did Dutchmen expect anyone to open it! You need a step ladder to reach it!
Rusty
rusty800@gmail.com