Imperial 30-Gauge 4 in. x 24 in. Galvanized Furnace Pipe is designed specifically for gas heating, ventilation, and air conditioning applications. This pipe is not intended for use with solid fuel appliances, ensuring safety and compatibility for its designated systems. The outside surface of the pipe is smooth, providing a clean and professional finish. Featuring a snap-lock design, it easy installation and secure connections for your HVAC needs. Model Number: