Profile: Elgen Manufacturing Company, Inc. manufactures sheet metal and HVAC products. Our products list comprises of flexible duct connectors, flanges, fasteners, weld pins, damper hardware and vanes & rails. Our notch lock flexible duct connector eliminates duct system noise and vibration. Our J flange attaches to the duct wall, and has a butyl sealant inside the pocket which provides an airtight seal along the duct wall.