The humidity in the crawl space is high during rainy season (winter) here, and I want to set up a dehumidifier. This means I need to close the crawl space vents temporarily. In the summer I won't need the dehumidifier and the vents would have to be opened again.
What's a good way to close the vents that is easy to re-open? I prefer being able to open and close them from the outside so I don't have to crawl into the crawl space.
Some of my house vents are "sunken" similar to this pic (not my house, just using it for convenience). Actually mine is sunken even deeper.