Builders Best 10308 Semi-rigid Flex Aluminum Duct 3in 8ft

Product Description

The BUILDERS BEST 10308 is a semi-rigid flexible aluminum duct section designed for residential and light-commercial ventilation applications. Measuring 3 inches in diameter and 8 feet in length, this duct section ships with one crimped end and one plain end, making it ready for direct connection to standard duct collars, exhaust fans, range hoods, bathroom fans, and dryer vents without additional fittings. The aluminum construction holds its shape under compression while still allowing the installer to route around framing, joists, and other obstructions common in tight retrofit spaces.

This duct section is suited for exhaust and supply air runs in residential HVAC, bath ventilation, kitchen range hood venting, and dryer exhaust systems where a rigid duct run is preferred over fully flexible foil duct. The 3-inch diameter is a common size in bath fan and spot ventilation installations. The pre-crimped end simplifies coupling to adjacent duct sections or fan outlets, reducing the number of transition fittings required on the job.

Key Features

• Semi-rigid aluminum construction holds shape while allowing moderate bending for routing flexibility
• 3-inch diameter fits standard bath fan, range hood, and spot ventilation duct collars
• 8-foot length provides a full single-run section without splicing
• One crimped end and one plain end included for straightforward in-line connection
• Aluminum material resists moisture and corrosion in exhaust air streams

Compatibility

Designed as an OEM-style replacement or new-installation duct section for 3-inch residential and light-commercial ventilation systems including bath fans, range hoods, and dryer exhaust runs.

Installation Notes

Installation is typically performed by HVAC technicians, plumbers, or sheet metal contractors following local mechanical codes and ASHRAE 62.2 ventilation requirements. De-energize any connected fan or appliance before connecting or disconnecting duct sections. Secure all joints with approved metal foil tape or adjustable hose clamps rated for duct work — avoid standard cloth duct tape, which degrades with heat and moisture. Minimize bends and keep total equivalent duct length within the connected appliance manufacturer's specifications to maintain proper airflow.

Technical Specifications

• Diameter: 3 inches
• Length: 8 feet
• Construction: Semi-rigid flexible aluminum
• End Configuration: 1 crimped end, 1 plain end

Standard Information

• Brand: BUILDERS BEST
• Manufacturer Part Number: 10308