Fireplace chimney draftstopper plug (round) - fits most metal, zero-clearance fireplaces. The Fireplace Draftstopper saves up to 30% on heat and air conditioning costs! The Fireplace Draftstopper stops uncomfortable cold chimney downdrafts! The Fireplace Draftstopper reduces the entry of odors and harmful toxins into the house! The Fireplace Draftstopper can pay for itself in heating cost savings in just one month! The Fireplace Draftstopper (small) fits any zero-clearance fireplace!