This DuraVent increaser allows you to connect a 3-inch pellet stove outlet to 4-inch venting pipe. Required for installations above 4,000 feet elevation where 4-inch pipe is needed for proper draft and combustion.

• Transitions from 3" appliance outlet to 4" vent pipe
• Double-wall construction: 444 stainless steel inner wall, galvalume outer wall
• Laser-welded seams for durability
• Twist-lock connection for quick, secure installation
• Metal-to-metal primary seal with encapsulated O-ring secondary seal
• Rated for continuous flue temperatures up to 570 deg F
• 1" clearance to combustibles
• UL 641 and ULC S609 listed

Tip: Seal the increaser to the appliance with high-temperature sealant. Always follow local building codes and manufacturer guidelines for pellet stove venting.

FOR CALIFORNIA SHOPPERS

Hello Californians! Your government wants us to show you the following message:

• ⚠ WARNING: THIS PRODUCT CAN EXPOSE YOU TO CHEMICALS INCLUDING CHROMIUM WHICH ARE KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER AND BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.