The Scandia SN-HG-8-SETEXT Set of Extensions is designed for use with 80,000 BTU gas heaters, providing necessary wall extensions when the wall thickness exceeds 5-1/2 inches. These extensions ensure proper installation and secure fitting of the heater through thicker walls, maintaining the efficiency and safety of the gas heater. Ideal for installations in saunas with thicker walls, this set of extensions allows for flexible heater placement while ensuring optimal performance.