4" x 8 Ft. Flexible Semi-Rigid Aluminum Duct w/ Crimped Lock

The Lambro 4-inch x 8-foot flexible aluminum semi-rigid (crimp-lock) duct is ideal for general HVAC venting applications that require air expulsion from the home. Suitable for HVAC systems, our semi-rigid ducts ensure minimal air leakage and optimal performance, resulting in significant energy savings and improved indoor air quality.

The duct is ideal for new and replacement installations. The semi-rigid duct is flexible; the corrugations throughout prevent collapsing and allow for easy duct bending when needed. Class 0 aluminum is corrosion-resistant, non-combustible, and flame-resistant, with a maximum operating temperature of 430°F. When installing the duct, you can cut it to length to allow for stretching for maximum airflow.

A semi-rigid and lightweight non-insulated flexible duct, the manufacturing process uses a dead soft aluminum strip, spirally wound and mechanically joined together, forming an airtight and leakproof seam. This self-supporting and corrosive-resistant product provides excellent strength and flexibility and is adaptable to any low-to high-pressure heating, ventilation, and air conditioning system.

The minimum bend radius to the center line is one diameter. However, our recommended radius is 1-1/2" diameters under accepted practice. The aluminum ducting can be easily cut to size and formed by hand.

Please be sure to check local building codes before installation.

Product Features:

• Bulk pack
• Mechanical joint makes an air-tight seam
• Circumferential corrugations provide excellent strength and flexibility
• Minimum bend radius to the center line is one diameter
• Easily cut to size and hand-formed
• Class 0 aluminum is corrosion-resistant
• Non-combustible
• Flame-resistant
• Maximum operating temperature of 430°F
• Recommended for bathroom fan, kitchen range hood, and general exhausting
• Do not use for clothes dryer installations (UL 2158A duct must be used)
• Installation clamps not included