638-125

This 4-inch by 60-inch B-Vent length is an essential component for safely venting residential and commercial gas-fired appliances. Engineered for use with Category I natural gas or liquid propane (LP) systems, this double-wall vent pipe features an aluminum inner liner and a galvanized steel outer casing. The insulated air space between the walls maintains high flue temperatures, ensuring a consistent draft and preventing condensation while keeping the outer pipe surface cool to minimize clearance requirements to combustible materials. Ideal for vertical or horizontal venting of furnaces, water heaters, and boilers, this 5-foot section provides durable, corrosion-resistant performance for high-efficiency HVAC installations.
Type: Metal Venting
Size: 4 inch Diameter x 60 inch Length
Dimensions: 60 inches × 4 inches (Inner Diameter) × 4 inches (Inner Diameter)
Application: Used for venting Category I gas-burning appliances such as natural gas or propane furnaces, water heaters, and space heaters.
Specifications: Double-wall construction, Type B Gas Vent, corrosion-resistant aluminum inner wall, galvanized steel outer shell, UL listed for safety compliance.