Home.Co - Brown Dust StopperStop drafts from doors and windows for good with the twin draft guard. The draft guard has been designed to snuggly hug doors and windows so that you're protected from drafts from both sides. Once you've cut the special insert to size, just slide it into place and you're done, no need to keep adjusting or fussing with it like other door draft stoppers. You can save a lot of power if you are running an air conditioner in your room. An ac needs to work