This 48-inch tall flat top stack is made of durable carbon steel with a 6-inch to 5-inch inside diameter, making it a versatile and practical choice for a variety of applications. The expanded/slotted design and 48-inch length ensure optimal performance, while the universal fit makes it compatible with most makes and models. Whether for industrial, commercial, or residential use, this carbon steel stack offers reliable and efficient exhaust ventilation. With its reduced inside diameter and sturdy construction, this stack is a dependable and cost-effective solution for your ventilation needs.