The Don Park BV4B5 4-inch by 5-foot Type B gas vent pipe is engineered to provide safe, dependable venting for approved Category 1 gas-burning appliances. Optimized for residential and light commercial heating systems fueled by natural gas or propane, this double-wall duct section is essential for venting furnaces, boilers, and water heaters through ceilings or walls.
This pipe features a high-grade aluminum inner liner that heats up rapidly and evenly to establish a strong, positive draft. The outer structural casing is built from durable galvanized metal, leaving an insulating air space between the layers. This double-wall configuration retains flue gas heat to prevent corrosive condensation within the run while maintaining minimal clearance requirements to nearby combustible materials.
Equipped with Don Park's proprietary acme groove seam lock system, the pipe segments interlock firmly without requiring mandatory joint screws, eliminating metal expansion clicking or banging sounds during thermal cycles. HVAC contractors and gas fitters rely on this 5-foot rigid length to construct clean, stable vertical vent stacks that exhaust combustion byproducts safely to the outside atmosphere.
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