Round Ventilation Silencer 100mm

A round galvanized steel ventilation silencer with a 100 mm insulation thickness (also known as a heavy-duty circular duct attenuator) is a premium acoustic device engineered for maximum suppression of high-intensity sound waves. This inline sound attenuator is integrated into the break of supply and extract air lines directly adjacent to fans or air conditioning equipment. Models featuring a thickened 100 mm acoustic insulation core are indispensable for facilities governed by strict environmental noise criteria, such as multi-family residential complexes, server hubs, open-plan corporate offices, boiler rooms, and industrial manufacturing sites. The silencer successfully dampens heavy low-frequency and medium-frequency equipment hums, restoring a comfortable and quiet environment.

The external protective shell and internal perforated sleeve are fabricated on automated production lines from heavy-duty hot-dip galvanized sheet steel, grade DX51D, with a dense zinc layer coating mass of Z275 (275 g/m²). The sound absorption chamber is filled with a dense, non-combustible basalt mineral wool layer precisely 100 mm thick. This design is fully fireproof, retains its geometric stability under high design static pressures, and remains highly resilient against moisture corrosion when handling humid air streams.

Key Benefits of the 100mm Round Silencer

• Maximum low-frequency sound suppression: The expanded 100 mm thick rock wool core traps and neutralizes deep, low-frequency sound waves that standard attenuators fail to stop, completely eliminating the heavy acoustic hum generated by powerful inline fan motors.
• Airstream purity with zero fiber erosion: The inner perforated steel lining is backed by a specialized non-woven membrane barrier. This fabric layer completely blocks the migration of basalt micro-particles into the ventilation flow, keeping the supply air safe and particle-free.
• Rapid inline assembly with male connection collars: Calibrated as a male connection profile, the silencer ports slide effortlessly inside standard straight round ducts. Pre-rolled mechanical stop beads precisely restrict the insertion depth to prevent axial misalignment and facilitate clean rivet or screw fixing.
• Factory-fitted double-lipped EPDM gaskets for perfect sealing: The connection ports come equipped with factory-installed dual-blade rubber gaskets. These expand tightly against the inner pipe walls to provide an immediate Airtightness Class D junction without requiring additional mastic or external sealing tape.

Technical Specifications and Acoustic Performance

Linear dimensions, installation tolerances, and nominal port calibrations comply fully with European standards EN 1505:2000 and EN 1506:2007. The internal perforated sleeve leaves the net free cross-section of the duct fully open. Note that the external casing diameter is significantly expanded due to the 100 mm insulation jacket, which must be accounted for when coordinating free overhead installation space.

Standard Available Dimensions

Acoustic Attenuation Efficiency Data

The following performance metrics define the real sound suppression capability (Efficiency S, dB) across standard octave bands specifically for the thick 100 mm insulation layer layout, extracted from technical catalog test data (Image 57bd44.jpg):

Assembly and Integration Guidelines

The silencer is integrated directly into the run of the circular air duct line. The male connection collars slide into the straight ventilation pipes until they seat flush against the mechanical stop bead, followed by fixing the joint points using standard rivets or self-tapping metal screws. When attaching the silencer directly to another molded element, such as a bend or a transitional reducer, a female sleeve coupling must be used to bridge the connection ports.