Chimney Balloon 36"x15" Inflatable Blocker (Large Chimney Pillow) Save up to 30% on your heating bill, and stop cold fireplace draft debris and odor! 15 years of happy Chimney Balloon owners say: "It pays for itself in savings on one heating bill!" Easy Do-it-yourself installation! Measure - Order - Install! Every fireplace is unique, so Chimney Balloons are available in 100 sizes! For more sizes call 608-467-0229 The US Department of Energy says 14% air infiltration enters the home through the fireplace.