4 in. Adjustable Worm Drive Duct Clamp (Model 284L)

Engineered for lasting performance, the Lambro Metal Clamp secures 4 in. vinyl ducting with ease. Constructed from robust, galvanized steel and featuring a precision-engineered worm-gear design, this clamp delivers a snug, leak-proof seal that stands up to vibration and thermal cycling. Ideal for HVAC installations, exhaust systems and lightweight ductwork, it provides professional-grade reliability for both residential and commercial applications.

Whether you're sealing a flexible duct run or reinforcing a hard-to-reach connection, this clamp installs in seconds with a simple screwdriver or nut driver. Its versatile design ensures consistent pressure around the duct, eliminating gaps and minimizing air loss for improved system efficiency.

Key Features

• Heavy-duty galvanized steel construction for corrosion resistance
• Worm-gear tightening mechanism for uniform, adjustable clamping force
• Engineered specifically for 4 in. vinyl ducting
• Easy installation with standard flat-head or Phillips screwdriver
• Vibration-resistant design maintains grip over time
• Ideal for HVAC, exhaust, and general ventilation applications

⚠️ WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.