Seal-tite 3172B-041207 Straight Boot 4x12x7 in 30 Gauge

Product Description

The SEAL-TITE 3172B-041207 is a straight sheet metal duct boot designed to transition between round duct and a rectangular floor, ceiling, or wall register opening. Fabricated from 30-gauge galvanized steel, this fitting measures 4 inches by 12 inches by 7 inches and provides a rigid, low-profile connection point at the supply or return air termination. HVAC technicians and sheet metal contractors install this boot as part of residential and light commercial forced-air distribution systems where a clean, durable duct-to-register transition is required.

This straight boot is suited for new construction and retrofit duct installations where the duct run terminates flush at the register face without an angled offset. The 4-inch round collar connects directly to standard 4-inch round or oval duct, while the 12-inch by 7-inch rectangular face accepts a correspondingly sized floor, wall, or ceiling register. It is a common fitting in residential forced-air heating and cooling systems served by gas furnaces, heat pumps, or air handlers.

Key Features

• Straight-boot design for direct duct-to-register transitions without angular offset
• 30-gauge galvanized sheet metal construction for rigid, corrosion-resistant performance
• 4-inch round collar mates with standard 4-inch round flexible or rigid duct
• 12 x 7 inch rectangular face sized for standard register grille fitment
• Compatible with both supply and return air termination applications

Compatibility

Designed as an OEM-style replacement or new-construction fitting for residential and light commercial forced-air duct systems requiring a 4-inch round to 12-inch by 7-inch rectangular straight boot transition.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor following local mechanical codes and SMACNA duct construction standards. Shut down the air handler or furnace and de-energize the system at the disconnect before beginning duct work. Secure the boot collar to the duct using sheet metal screws and seal all joints with UL 181-listed duct mastic or foil tape to prevent air leakage. Fasten the rectangular face flange to the register opening framing to ensure a secure, airtight fit before installing the grille or diffuser.

Technical Specifications

• Round Collar Diameter: 4 inches
• Rectangular Face Dimensions: 12 x 7 inches
• Gauge: 30 GA
• Material: Galvanized Sheet Metal
• Boot Style: Straight

Standard Information

• Brand: SEAL-TITE
• Manufacturer Part Number: 3172B-041207