Greenhouse Inflation Air Intake Cheap

I just bought a dryer exhaust and busted off the flap inside, since I want it to work in reverse. Pulling air from outside has less moisture versus the higher humidity on the inside of the greenhouse. I’ve installed these on big commercial greenhouses and they have more parts meant for this use, but it’s basically the same. Stop back for more diy greenhouse projects and a Range of other Homesteading tips on the cheap.