Builders Best 110222A Ul 181 Foil Flexible Air Duct Connector 4 Inches X 25 Feet

Product Description

The Builders Best 110222A is a UL 181 rated foil flexible air duct connector designed for use in residential and light commercial HVAC systems. It measures 4 inches in diameter and extends 25 feet in length, making it a practical choice for connecting air handlers, furnaces, bathroom exhaust fans, range hoods, and dryer vents to ductwork runs. This product carries a Class 1 air connector label, which meets strict standards for flame spread and smoke development in air distribution systems. HVAC technicians and installers rely on UL 181 certified flexible duct to stay code compliant on new construction and retrofit jobs.

The 110222A features a multi-ply construction that combines metalized polyester with an aluminum and polyester laminate. A steel wire helix runs the full length of the duct, providing structural support to maintain round shape under airflow pressure and through bends. The wire pitch for the 4-inch diameter model is 1 inch, which gives the duct consistent flexibility without collapsing during installation or use. This wire-supported foil design handles typical HVAC supply and return airflow conditions with durability that holds up over time.

The duct is compressed for easy shipping and storage, then expands to its full 25-foot working length on the job. UL certification stickers are applied every 10 feet along the duct, helping inspectors and installers confirm code compliance at a glance. Made in the USA, this product is sold by the box and is a go-to flexible duct option for heating and cooling contractors, sheet metal workers, and general HVAC technicians who need reliable, code-compliant flexible connectors for residential and light commercial projects.

• UL 181 Class 1 air connector rating meets building code requirements for flexible air duct installations
• Multi-ply construction of metalized polyester and aluminum/polyester laminate with steel wire helix support
• 4-inch diameter, 25-foot length, compressed for easy transport and storage with UL stickers every 10 feet

Product Highlights

The Builders Best 110222A delivers a code-compliant, flexible foil duct solution built for professional HVAC installers. Its multi-ply foil construction and steel wire support provide lasting performance across a wide range of air distribution applications.

Product Information

Standard Information

• Brand: BUILDERS BEST
• Manufacturer Part Number: 110222A

Technical Specifications

• Duct Diameter: 4 inches
• Duct Length: 300 inches (25 feet)
• Composition: Wire-helix multi-ply foil duct; aluminum/polyester laminate and metalized polyester with steel wire support
• Wire Pitch: 1 inch
• UL Rating: UL 181 Class 1 Air Connector
• Adjustable: Yes
• Compressed: Yes
• Primary Material: Aluminum
• Country of Origin: USA
• UPC: 722048102224
• Weight: 2.31 pounds
• Unit of Measure: Box