Seal-tite 3172B-061208 Straight Boot 6x12 to 8 in

Product Description

The SEAL-TITE 3172B-061208 is a straight sheet metal boot designed for HVAC duct distribution systems. This fitting transitions from a 6-inch by 12-inch rectangular opening to an 8-inch round collar, allowing installers to connect rectangular trunk lines or plenums to round flex duct or rigid round branch runs. Fabricated from 30-gauge steel, it provides the structural integrity needed for low-pressure residential and light commercial supply or return air applications. HVAC sheet metal mechanics and duct installers select this boot when a flush, straight-through transition is required without an offset or angled drop.

This straight boot is suited for residential forced-air systems where rectangular ductwork terminates at a ceiling, floor, or wall register location, or where a branch takeoff must connect to a round duct run. It fits naturally into new construction framing bays and retrofit installations where the duct path runs in a straight line from the trunk to the register opening. Installers working with standard residential air handlers, furnaces, or fan coil units will find this fitting compatible with common trunk-and-branch duct layouts.

Key Features

• Straight boot design eliminates offset for direct, in-line duct transitions
• Transitions a 6-inch by 12-inch rectangular opening to an 8-inch round collar
• Fabricated from 30-gauge steel for rigid, durable construction
• Suitable for low-pressure residential and light commercial HVAC duct systems
• Compatible with standard flex duct and rigid round duct connections at the 8-inch collar

Compatibility

Designed as an OEM-style sheet metal fitting for residential and light commercial forced-air HVAC duct systems requiring a rectangular-to-round straight boot transition.

Installation Notes

Installation is typically performed by licensed HVAC technicians or qualified sheet metal mechanics. Shut down and de-energize the air handling system before cutting into existing ductwork or securing the fitting. Seal all joints with listed duct mastic or UL 181-rated tape per local mechanical code requirements. Secure the round collar connection to flex or rigid round duct using approved clamps or drive cleats as the application requires.

Technical Specifications

• Rectangular Opening: 6 inches x 12 inches
• Round Collar Diameter: 8 inches
• Gauge: 30 GA
• Boot Style: Straight

Standard Information

• Brand: SEAL-TITE
• Manufacturer Part Number: 3172B-061208