The HELI FSD 250 telephone silencer from Helios is a high-quality ventilation system specifically designed to effectively reduce noise in ventilation systems. With a robust construction made of flexible aluminum tubing, this product offers a durable solution for various applications. The perforated inner lining is equipped with a resin-bonded sound insulation pack that has a thickness of approximately 50 mm, ensuring excellent soundproofing. The silencer features socket connections on both sides, allowing for easy installation, either by sliding it into the duct or by connecting it to fans or ducts using a fastening collar. When planning ventilation systems, the quadruple duct friction resistance should be taken into account to ensure optimal performance.

• Flexible aluminum design for easy handling
• Perforated inner lining with effective sound insulation
• Socket connections on both sides for versatile connection options
• Consideration of duct friction resistance in system calculations.