Chimney Balloon Large, co. Save up to 30% on your heating bills by simply fitting a Chimney Balloon. Measurements can be approximate, then choose the Chimney Balloon of the appropriate size or slightly larger than your chimney (up to 6" larger in either dimension). We suggest you use a flexible About this item For brick/masonry fireplaces with a rectangular damper . Installs below the damper quickly and easily with no mess Inflatable plug made of polyurethane . Allows a little ventilation. How to Fit How to position and measure: Measure your chimney about a foot or so out of sight where your Chimney Balloon will fit as shown in the diagrams. It stops heat loss by acting as a chimney plug draft stopper that air seals and insulates the fireplace. The balloon helps create an airtight seal that stops heat from escaping and keeps cold drafts from coming in. 1-size fits most any brick fireplace Installs below the damper quick, clean, easy . u0yeds, hfg5, ka, rczkjj, afglv, rw, 8y9s2s, 8xzc, yskz, albdj,