Gray Metal South 16X8-151SD Trunk Duct Start Collar 16x8

Product Description

The GRAY METAL SOUTH 16X8-151SD is a sheet metal offset start collar designed for slide and drive trunk duct connections in forced-air HVAC systems. Part of the 151SD series, this fitting transitions from a trunk duct to a branch run using a slide and drive connection method, which allows for fast, tool-light assembly on the job. The offset design accommodates installation scenarios where a straight collar will not clear the surrounding structure or ductwork. At 16 inches by 8 inches, it fits standard rectangular trunk duct openings common in residential and light commercial forced-air systems. HVAC sheet metal mechanics and duct installers are the primary trade for this component.

This start collar is suited for warm air duct systems where rectangular trunk duct serves multiple branch takeoffs. The 16 x 8 inch opening fits standard trunk duct sizing used in residential furnace and air handler installations. The offset configuration is particularly useful in tight mechanical rooms, crawlspaces, or finished basements where a centered inline collar cannot be positioned without conflicting with joists, beams, or other obstructions. The slide and drive connection style integrates directly with matching S-drive and drive cleats for a secure, low-profile seam.

Key Features

• Offset start collar design clears structural obstructions during trunk duct installation
• Slide and drive connection method for fast field assembly without additional fasteners
• Sheet metal construction for durability and compatibility with standard HVAC duct systems
• 16 x 8 inch size fits common residential and light commercial rectangular trunk duct openings
• Part of the 151SD series for consistent fitment with other Gray Metal South components

Compatibility

Designed for use with warm air duct systems using slide and drive trunk duct construction. Fits standard 16 x 8 inch rectangular trunk duct openings. Intended for use with matching S-cleats and drive cleats standard to slide and drive duct assembly.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal mechanics. Shut down the air handling system and verify power is off before cutting into or modifying any existing trunk duct. Secure the collar with drive cleats and S-cleats per SMACNA duct construction standards, and seal all seams with UL 181-rated mastic or foil tape where required by local mechanical code. Confirm the offset orientation before fastening to avoid misalignment with the branch duct run.

Technical Specifications

• Size: 16 x 8 inches
• Material: Sheet Metal
• Series: 151SD
• Type: Slide and Drive Trunk Duct Offset Start Collar
• Suitable For Use With: Warm Air System

Standard Information

• Brand: GRAY METAL SOUTH
• Manufacturer Part Number: 16X8-151SD