These chimney caps are designed as replacements for "Air Insulated" factory built chimneys or prefab fireplace stacks with the listed size as the inner diameter. It uses a special construction to maintain proper internal venting on double or triple wall chimneys. These use a friction fit collar for universal application and easy installation and cleaning.
304 - Alloy
Replacement for most manufacturers air cooled chimneys
Friction fit fits 99% of chimneys with the proper inner diameter