Attenuators for Circular Duct
Attenuators for Circular Duct
Waha Air's circular duct attenuators are purpose-built acoustic components that reduce airborne and structure-borne noise generated by fans, AHUs, and airflow turbulence within HVAC ductwork — delivering the comfortable, low-noise indoor environments demanded by modern commercial and residential buildings.
Noise Control at the Source
Circular duct attenuators — also referred to as duct silencers — are installed in-line within the ventilation ductwork to absorb and dissipate sound energy before it reaches occupied spaces. They are essential wherever HVAC noise must be kept within strict limits: in open-plan offices, hotel rooms, hospitals, broadcast studios, educational facilities, and high-end residential developments.
By selecting the correct attenuator length, diameter, and absorptive fill density, Waha Air's engineering team can target specific frequency bands — particularly the mid-range frequencies (250–2000 Hz) that are most disruptive to speech intelligibility and occupant comfort — while keeping pressure drop to a minimum.
Typical Applications:
Commercial offices, hotel guest rooms and corridors, hospitals and clinics, schools and universities, recording studios, data centers, residential apartment ventilation, retail spaces, and auditoriums.
Robust Construction for Long-Term Performance
The outer casing of Waha Air circular duct attenuators is fabricated from galvanized steel sheet, providing structural rigidity and resistance to the temperature and humidity variations typical in UAE climate conditions. The inner liner is a perforated galvanized or stainless steel sleeve that retains the acoustic infill while allowing sound waves to pass through for absorption.
Acoustic infill is high-density mineral wool or glass wool, selected for its broad-spectrum sound absorption coefficients and long-term dimensional stability. All infill materials are non-hygroscopic, non-combustible, and compliant with building fire safety requirements.
Standard and Splitter-Type Configurations
Straight-through (tubular) attenuators are used for standard circular duct runs and are available in diameters from 100 mm up to 1,000 mm, with active lengths from 600 mm to 2,000 mm to achieve the required insertion loss. For installations with space constraints or very high airflow rates, pod-and-splitter arrangements can be configured to maximize attenuation performance within a shorter overall length.
Key Features
- Available in diameters from 100 mm to 1,000 mm to suit standard circular duct sizes
- Broad-spectrum insertion loss — effective across 125 Hz to 4,000 Hz octave bands
- Low aerodynamic resistance design minimizes additional static pressure drop in the system
- Galvanized steel outer casing with perforated inner liner — durable and corrosion-resistant
- Non-combustible mineral wool or glass wool acoustic infill — fire-safe and compliant with UAE building codes
- Active lengths from 600 mm to 2,000 mm — selectable to achieve target insertion loss values
- Straight-through tubular and pod-and-splitter configurations to suit space constraints
- Slip-socket or flanged end connections for straightforward inline duct installation
- Suitable for supply, return, and exhaust air applications in commercial, hospitality, healthcare, and residential projects