Fan noise traveling through ductwork is one of the most common complaints in modern ventilation. In fresh air systems and heat recovery (ERV / HRV) units, the supply and exhaust fans generate continuous airborne noise that spreads from room to room through the duct network.
Our Perforated Plate Silencer is an aerodynamic duct silencer purpose-built for fresh air ventilation and heat recovery systems. It delivers effective broadband noise attenuation with very low pressure drop — typically 10–30 Pa at rated airflow — so your system stays quiet and efficient.
The silencer is a duct-mounted unit whose core is a precisely perforated plate assembly inside an acoustically engineered housing. Sound passing through the duct enters the perforations, where acoustic energy is dissipated and reflected, while the airstream passes through with minimal disturbance.
Three mechanisms work together:
Acoustic energy dissipation — sound waves entering the small perforations lose energy through air-particle friction, converting noise into heat;
Impedance mismatch & reflection — at the perforated plate boundary, part of the sound is reflected back upstream, weakening the noise travelling downstream;
Aerodynamic duct design — the hole pattern and chamber geometry are tuned so air flows smoothly, keeping pressure loss low.
The design targets the mid-to-high frequency range where fan blade-pass noise and duct turbulence dominate, with insertion loss of up to 20 dB across the 250–4000 Hz band. Because the perforated plate shields the internal acoustic media from direct airflow, performance stays stable over years of continuous operation — no media erosion, no fiber shedding into the supply airstream.
Key features
Built for fresh air & heat recovery duty — low pressure drop protects ERV / HRV core efficiency;
Perforated plate protects the acoustic media — no fiber shedding into the supply airstream;
Effective broadband attenuation, especially mid-to-high frequency fan noise;
Galvanized steel casing as standard, stainless steel available on request;
Circular and rectangular profiles to match standard duct sizes;
Low maintenance, cleanable, compatible with standard duct flanges and couplings.
| Parameter | Value | Notes |
|---|---|---|
| Product type | Perforated plate duct silencer | Circular / rectangular |
| Application | Fresh air (FAU), ERV / HRV, exhaust systems | Supply or return side |
| Duct connection sizes | Ø100 / 125 / 150 / 160 / 200 mm | Other sizes on request |
| Recommended air velocity | 2 – 6 m/s | Higher velocity = higher pressure drop |
| Insertion loss | Up to 20 dB (250 – 4000 Hz) | Typical; measured per ISO 7235 / ASTM E477 |
| Pressure drop | Approx. 10 – 30 Pa @ rated airflow | Typical; low by design |
| Casing material | Galvanized steel (304 SS optional) | On request |
| Operating temperature | -20 to +80 °C | Standard HVAC range |
Engineered for any ducted air system where fan noise must be controlled without sacrificing airflow:
Fresh air / ventilation systems — supply and exhaust ducts in apartments, villas and commercial buildings;
Heat recovery units (HRV / ERV) — attenuate fan noise on both fresh-air and exhaust-air branches;
Offices, schools, hotels, hospitals — keep occupied spaces below target NC levels;
Cleanrooms and laboratories — noise control with zero fiber shedding into the airstream.
In a typical ERV installation, two silencers are fitted — one on the fresh-air supply branch and one on the exhaust branch — cutting transmitted fan noise while preserving the static pressure the recovery core needs to operate efficiently.
Quiet ventilation is about engineering, not compromise. Our Perforated Plate Silencer helps you deliver comfortable, low-noise fresh air while keeping your heat recovery system energy-efficient — a one-time investment that performs for the life of the installation.
Every unit can be sized to your duct dimensions, airflow rate and noise target. We support the full process — from selection calculation and custom manufacturing to technical documentation. Contact our sales team for datasheets, samples and project pricing.
Related products: Round duct silencer · Rectangular duct silencer · HRV / ERV accessories
Q: Which duct connection sizes are available?
A: Standard duct connection sizes are Ø100, Ø125, Ø150, Ø160 and Ø200 mm. Other sizes are available on request.
Q: How much noise reduction does the silencer give?
A: Insertion loss is up to 20 dB across 250 – 4000 Hz, typically measured per ISO 7235 / ASTM E477. Pressure drop is approximately 10 – 30 Pa at rated airflow.
Q: What air velocity and operating temperature does it suit?
A: The recommended air velocity is 2 – 6 m/s, and the standard operating temperature range is −20 to +80 °C. The casing is galvanised steel, with 304 stainless steel available on request.
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