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 easy to install and remove, making it an eco-friendly solution for maintaining a cozy home. This balloon stops down draughts and updraughts, preventing debris, soot, and bird mess from entering your home. It can be inflated to install and deflated to remove, allowing for a little ventilation. The De Vielle Chimney Balloon is completely reusable and measures 300x280mm.