plissékaihtimet
Plissékaihtimet, a term of Finnish origin, describes a specific type of heating device. Literally translating to "pleated chimney" or "folded chimney," it refers to a heating system that utilizes a series of folded or pleated metal sheets to create a larger surface area for heat exchange. This design is intended to maximize the efficiency of heat transfer from the combustion gases to the surrounding air or water.
These heating systems are often found in specialized industrial applications or in certain types of wood-burning