Seal-tite 1373L-041207 Left End Boot 4x12 with Extension

Product Description

The SEAL-TITE 1373L-041207 is a left-end duct boot designed for residential and light commercial HVAC systems where a supply or return air register connects at a terminal end of the ductwork run. Measuring 4 inches by 12 inches with a 7-inch throat and a 2-inch extension, this boot provides the dimensional flexibility needed to bridge offsets between the duct opening and the floor, wall, or ceiling register cutout. HVAC installers and sheet metal technicians use end boots like this one to terminate rectangular duct runs cleanly and securely at the register face.

This left-end configuration is suited for installations where the duct approaches the register opening from the right and the boot turns left to align with the register face. The 2-inch extension accommodates deeper floor or ceiling cavities, reducing the need for field fabrication or add-on collars. Typical applications include new construction duct systems, HVAC retrofit work, and mobile or modular housing installations where Sealtite-style fittings are a common standard.

Key Features

• Left-end boot orientation for proper directional alignment at register termination
• 4 inches by 12 inches face opening matches standard register and grille sizing
• 7-inch throat depth for proper duct-to-boot connection
• 2-inch extension provides additional depth clearance for offset or deep-cavity installations
• Designed to eliminate field fabrication at the register termination point

Compatibility

Designed as an OEM-style replacement or new-installation fitting for rectangular duct systems using 4 inches by 12 inches register openings with a left-end boot configuration.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer. Power down the air handler or furnace at the disconnect before working in the duct system. Secure the boot to the duct collar using sheet metal screws and seal all joints with UL-listed foil tape or mastic sealant per local mechanical code requirements. Confirm left versus right orientation before fastening to avoid misalignment with the register cutout.

Technical Specifications

• Face Opening: 4 inches x 12 inches
• Throat Depth: 7 inches
• Extension Length: 2 inches
• Orientation: Left End

Standard Information

• Brand: SEAL-TITE
• Manufacturer Part Number: 1373L-041207