The De Vielle Chimney Balloon small is an inflatable balloon that fits into your chimney to block drafts, preventing heat loss and cold air infiltration. It's an eco-friendly solution for maintaining a cozy home. It stops down draughts and updraughts, and prevents debris, soot, and bird mess. To install, simply inflate it, and to remove, deflate it. It allows for a little ventilation and is completely reusable. The size is 300x280mm.