8" Stainless steel chimney section is currently shipped with Classic Edge 750/760/960 models, CleanFire 700/900 models, Classic & Pallet Burner models and E-Classic models (except ECL1450). Shipped with E-Classic 1400 since s/n E100299 and with E-Classic 2300 since s/n E17856. Compatible with Chimney Extension (p/n 6500002). If connecting to Chimney Extension (p/n 6500002), use the 8" Chimney Band Clamp Kit (p/n 4518) at the joints, not the Chimney Locking Band (p/n 10509). For outdoor applications only. Not to be used for venting of indoor heating appliances. Sections are four feet long. NOTE: Classic furnaces with square chimney box require a Chimney Conversion Adapter (p/n 6757).