Q: Jason – I have a cast in place poured chimney liner with a round opening of about 8 inches. Do you have a Chimney Balloon specifically for round or oval liners? – DD

A: DD, A 9X9 Chimney Balloon will work just fine with a 8″ diameter cast in place poured chimney liner. The 9×9, 12×12 and 15×15 will work well with a round or oval shape flue. Attached is a picture example of how a 9×9 Chimney Balloon collapses its corners to fit in a 8″ diameter round flue.- Jason