One way air valve


Active member
Does anyone have any decent ideas or a place to find a one way air valve so it will be closed when my dry room vent van isn't on but when it starts blowing it will push it open? I am envisioning a trap door time thing. It's basically a 6" vent right now with a large case fan.

Sheep Shagger

Personally I’d steer clear of anything designed for RV or house, as they simply don’t stand up. I’ve had really good luck with marine grade equipment. So something like a marine scupper valve would probably be the place I’d start looking depending on where you’d want to place it.
something like this.