The double-walled chimney is available in different sizes 🔹️10🔹️15🔹️20🔹️30🔹️40🔹️50🔹️100🔹️150.

Important tips:
Using the chimney Double-walled windows are highly recommended for fan packages because, in addition to ensuring the safety of the residents of the house against the risk of suffocation, it is also very effective in the quality of the air in the house and to some extent increases the combustion efficiency by preheating the incoming air in the vicinity of the room temperature. It becomes the middle of the chimney.