Value Collection 21503100 Duct Flatway 90 Stack Elbow

Product Description

The VALUE COLLECTION 21503100 is a galvanized steel flatway 90-degree stack elbow designed for residential and light commercial sheet metal ductwork systems. This fitting transitions airflow at a 90-degree angle within low-profile duct runs, making it well-suited for floor joist bays, crawl spaces, and between-floor installations where vertical clearance is limited. At 10 inches wide and 3.25 inches high, it fits standard flatway stack duct configurations. Fabricated from galvanized steel at standard gauge, it resists corrosion in typical HVAC air distribution environments. HVAC sheet metal mechanics and duct installers specify this elbow when routing supply air stacks through tight framing cavities.

This fitting is used in forced-air heating and cooling systems where supply air must change direction from a horizontal trunk or plenum into a vertical stack. It is commonly installed in new construction and retrofit applications where low-profile duct geometry is required. The 10-inch width accommodates standard residential stack duct widths, and the 3.25-inch height matches the most common floor-joist-depth duct profiles. Installation is typically performed by licensed HVAC contractors or sheet metal workers during rough-in or duct modification work.

Key Features

• Galvanized steel construction resists corrosion in air distribution applications
• Flatway 90-degree stack elbow geometry for tight-clearance framing installations
• 10-inch overall width matches standard residential stack duct sizing
• 3.25-inch height fits standard floor-joist duct profiles
• Standard gauge sheet metal provides structural integrity in low-profile runs

Compatibility

Designed as an OEM-style replacement and standard fitting for residential and light commercial forced-air duct systems using flatway stack duct configurations with a 10-inch width and 3.25-inch height profile.

Installation Notes

Installation is performed by licensed HVAC technicians or sheet metal workers. Shut down the air handling unit and verify the system is depressurized before modifying any duct section. Secure all joints with sheet metal screws and seal with UL 181-listed duct tape or mastic sealant in accordance with local mechanical codes. Avoid sharp bends in connected flex duct that could restrict airflow through the elbow.