The Don Park BV6B2 is a rugged double-wall B-vent duct pipe section designed to assist in the safe exhaust management of Category I gas-burning heating equipment. This component features a 6-inch inside diameter and an 18-inch length, serving as a versatile spacer or extension piece within complex flue layouts. It is commonly implemented on residential and commercial furnaces, boilers, water heaters, and gas-fired unit heaters.
The pipe relies on Don Park's engineered knurled acme groove seam lock configuration, which ensures a tight, stable connection between nested sections without requiring field screws. This advanced locking method prevents material thermal ticking or popping sounds during standard equipment heating and cooling cycles. If an installer chooses to add screws for additional security, the length must not pierce the protective inner wall.
HVAC contractors select this lightweight aluminum pipe to maintain a safe 1-inch clearance distance to surrounding combustible wood framing. It is rated for peak operating temperatures up to 243°C and works seamlessly across both natural gas and propane installations. Verify your overall run geometry and coordinate with matching tees, elbows, and caps to complete a code-compliant venting structure.
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