The Draft Stopper is an inflatable urethane pillow measuring 38" x 16". It is quickly and easily installed in the fireplace just below the damper level.The Draft Stopper can be adapted to work in almost all fireplaces. Even if you have an unusual construction, the Draft Stopper can be successfully installed in less than 2 minutes.The Draftstopper is provided with 5 "slittable" areas that can be cut to provide an opening for a damper handle. As the Draftstopper is inflated it seals around the damper handle sealing the opening!Stop valuable warm air from leaving your home and minizing drafts from your fireplace. Some heating experts claim that an unlit fireplace with a damper open can increase heating costs by as much as 30 percent. Now that could add up to $500 over the course of a season. Well, here's a solution that's relatively inexpensive, easy to install and pretty much invisible.