Type B Vent pipe consists of an inner and outer pipe. The inner pipe is typically made of what material?

The inner pipe of a Type B vent is typically made of aluminum. This material is chosen for its lightweight properties and excellent resistance to corrosion, which makes it suitable for the management of gases that can be both acidic and condensing in nature. Aluminum's low weight simplifies installation, while its durability ensures a long life span in various venting conditions.

Galvanized steel, while commonly used in a variety of construction applications, is less effective in environments with high moisture and can succumb to rust over time. Stainless steel is often used in other venting applications due to its high resistance to heat and corrosion but is generally heavier and more expensive than aluminum for this particular application. Black iron, typically used in plumbing applications, is not suitable for venting due to its tendency to corrode in the presence of moisture.

Therefore, the choice of aluminum for the inner pipe in Type B venting systems aligns perfectly with the requirements of efficient and durable venting solutions.