Seal-tite 1279-041207 Elbow Register Boot 4x12x7 in with Rails

Product Description

The SEAL-TITE 1279-041207 is a 4-inch by 12-inch by 7-inch elbow register boot designed for basement and ceiling HVAC register installations. It includes 16-inch rails that position the boot and support the register during installation. This fitting serves as the transition point between the supply duct run and the floor or ceiling register opening. HVAC installers use it to direct conditioned air from a rectangular duct into the occupied space through a standard register. The elbow geometry accommodates installations where the duct approaches the register from a horizontal run into a vertical drop or rise.

This boot is suited for residential HVAC systems where supply air is distributed through basement ceilings or overhead ceiling applications. The 4-inch by 12-inch throat matches standard rectangular duct sizes common in residential forced-air systems. The included 16-inch rails extend the boot to span typical joist bays or framing cavities, simplifying rough-in and register placement during new construction or retrofit work.

Key Features

• 4-inch by 12-inch by 7-inch elbow geometry for horizontal-to-vertical duct transitions
• Includes 16-inch rails for spanning joist bays and securing register placement
• Designed for basement ceiling and overhead ceiling register applications
• Fits standard 4-inch by 12-inch rectangular supply duct connections
• Elbow profile directs airflow from horizontal duct runs into vertical register openings

Compatibility

Designed as an OEM-style replacement or new-construction fitting for residential forced-air systems using 4-inch by 12-inch rectangular supply ductwork with standard ceiling or basement register configurations.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer. Shut down the air handler and confirm the system is de-energized before working on supply duct connections. Secure the boot to framing members using the included rails and fasten duct connections with appropriate sheet metal screws and mastic sealant or UL-listed foil tape per local mechanical code requirements. Do not operate the system until all duct connections are fully sealed and the register is properly seated.

Technical Specifications

• Throat Size: 4 x 12 inches
• Boot Depth: 7 inches
• Rail Length: 16 inches
• Boot Type: Elbow
• Application: Basement and Ceiling Register

Standard Information

• Brand: SEAL-TITE
• Manufacturer Part Number: 1279-041207