Lukjan 17-307 Stack Boot Center End 3-1/4 X 10 Inches

Product Description

The LUKJAN 17-307 is a steel stack boot fitting designed for residential and light commercial HVAC duct systems. It connects a 7-inch round inlet to a 3-1/4 x 10-inch stack duct, routing conditioned air from the main trunk line into narrow wall or floor cavities. The center-end configuration positions the round inlet at the center of the boot, making it well suited for straight-run stack installations. Fabricated from steel, this fitting delivers durable, long-term performance in forced-air distribution systems. Licensed HVAC technicians and sheet metal installers typically specify this boot when transitioning from round branch ductwork to a slim stack profile.

This boot is used in residential forced-air heating and cooling applications where space constraints require a narrow 3-1/4-inch stack duct. It fits common floor, wall, and stud-cavity stack configurations in new construction and retrofit projects. The center-end inlet orientation supports a clean, low-profile transition without the need for additional offset fittings, reducing pressure drop and simplifying duct layout in tight framing conditions.

Key Features

• Center-end inlet design for straight-run stack duct installations
• 7-inch round inlet connects directly to standard round branch duct
• 3-1/4 x 10-inch stack duct opening fits narrow wall and floor cavities
• Steel construction for durability in residential and light commercial systems
• Compact body supports low-profile duct routing in framed stud cavities

Compatibility

Designed as an OEM-style replacement and new-installation fitting for residential and light commercial forced-air HVAC duct systems using 3-1/4 x 10-inch stack duct with a 7-inch round branch connection.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Shut down and lock out the air handler or furnace before making any duct connections. Secure all joints with sheet metal screws and seal with UL 181-rated mastic or foil tape per local mechanical code requirements. Do not operate the system with unsealed duct connections.