Air terminal units provide localized or zone control of air distribution in buildings by regulating the air volume and may be equipped with supplemental heating and cooling systems. Our innovative and performance-based noise and vibration control strategies effectively attenuate radiated noise, inlet noise, outlet in-duct noise, break-out noise, and structure-borne noise from these systems in an open ceiling or drop ceiling plenum space. We also provide aesthetically appealing and ASTM E84 Class A fire rating solutions. Using a holistic approach and engineered equipment-specific solutions, we manufacture sound and vibration products for air terminal systems to meet your unique specification requirements, increasing their effectiveness and your peace of mind.
Scroll down to explore our noise and vibration solutions for air terminal unit systems.

Casing Radiated Noise
Radiated Noise from the ATU cabinet/casing is often a primary contributing source to the spaces directly below. Care should be taken to locate ATUs away from ceiling return air grilles for plenum return applications.

Induction Inlet Noise
Induction Inlet Noise is a primary contributing source for units with induction air openings. Drawing air directly from the ceiling plenum, they have only a thin particulate filter to deter noise radiation at the opening.

In-Duct Discharge Noise
ATU Discharge Noise travels downstream in the discharge ductwork. Discharge Noise is a product of air turbulence through the box valves regulating air volume based on room demand. Fan Powered units usually have a Forward Curved (FC) fan producing fan noise at the unit discharge.

Discharge Breakout Noise
Duct Breakout Noise can take place anywhere in the ductwork upstream or downstream of the ATU. It is the sound passing through the walls of the ductwork radiating to build- ing spaces below. Ductwork resistivity to Breakout Noise is a function of the wall mass, duct component shape, profile and size. Breakout Noise in ATU applications is greatest on the discharge/outlet side of the unit in the first 6′ to 8′ of ductwork.

Casing Radiated Noise
Radiated Noise from the ATU cabinet/casing is often a primary contributing source to the spaces directly below. Care should be taken to locate ATUs away from ceiling return air grilles for plenum return applications.

Induction Inlet Noise
Induction Inlet Noise is a primary contributing source for units with induction air openings. Drawing air directly from the ceiling plenum, they have only a thin particulate filter to deter noise radiation at the opening.

In-Duct Discharge Noise
ATU Discharge Noise travels downstream in the discharge ductwork. Discharge Noise is a product of air turbulence through the box valves regulating air volume based on room demand. Fan Powered units usually have a Forward Curved (FC) fan producing fan noise at the unit discharge.

Discharge Breakout Noise
Duct Breakout Noise can take place anywhere in the ductwork upstream or downstream of the ATU. It is the sound passing through the walls of the ductwork radiating to build- ing spaces below. Ductwork resistivity to Breakout Noise is a function of the wall mass, duct component shape, profile and size. Breakout Noise in ATU applications is greatest on the discharge/outlet side of the unit in the first 6′ to 8′ of ductwork.

Upstream Breakout Noise
Duct Breakout Noise upstream of the ATU is a secondary contributing source in most applications. The air valve modulating airflow at the ATU inlet can cause regenerated noise from turbulence that breaks out upstream of the unit. Residual RTU noise can also breakout in the upstream ductwork.

Diffuser Noise
Diffuser Noise comes from two sources. All residual noise traveling in-duct on the dis- charge side of the air terminal box will dump into the occupied space at supply diffuser locations. Return grilles are usually secondary contributors except where open to the plenum in close proximity to plenum mounted equipment. Regenerated noise is the second source emitting at diffusers caused by turbulence attributable to discontinuities through the typical flex duct runs attaching to the throat of the diffuser grille.

ATU
PRE
4-6dB(A)

Premium

The HUSHCORE® Premium™ System addresses cabinet radiated sound using HUSH FLEX™ composite acoustical curtains in a Velcro removable panel design for easy equipment access.

Sample Installation Images

Premium Highlights

  • Source Control using HUSH FLEX™ Velcro removable cabinet wrap jackets
  • Reduces cabinet radiated noise with all types of Air Terminal Units, In-line fans and plenum suspended air handlers
  • 4 to 6 dB(A) typical reduction of radiated sound
  • Model PWN-250 panels are standard
  • Models PWR-350 or PWA-500 where Class A flammability is required.
  • Offered in various colors - grey (standard), black, white and beige.
View or Download Specification Docs
Hushcore Drawing
ATU
SUP
4-6+dB(A)

Supreme

SUPREME-I™ SYSTEM
The HUSHCORE® Supreme-I™ System addresses both radiated sound using HUSH FLEX™ Velcro removable panels and a HUSH DUCT™ silencer for the induction fan inlet air opening.

SUPREME-D™ SYSTEM
The HUSHCORE® Supreme-D™ System addresses both radiated sound using HUSH FLEX™ Velcro removable panels and a HUSH DUCT™ silencer for the terminal unit discharge.

Sample Installation Images

Supreme Highlights

SUPREME-I™ SYSTEM

  • HUSH FLEX™ removable cabinet wraps for cabinet radiated sound
  • HUSH DUCT™ silencers for open inlet/return noise
  • 4 to 6 dB(A) reduction of radiated sound
  • 4 to 6+ dB(A) reduction of inlet/return Noise
  • Project Performance Driven
  • Model PWN-350 and PWA-500 (Class “A”) HUSH FLEX™ enclosure with Insertion Loss per ASTM E-1222

SUPREME-D™ SYSTEM

  • HUSH FLEX™ removable cabinet wraps for cabinet radiated sound
  • HUSH DUCT™ silencers for open inlet/return noise
  • 4 to 6 dB(A) reduction of radiated sound
  • 4 to 6+ dB(A) reduction of inlet/return Noise
  • Project Performance Driven
  • Model PWR-350 and PWA-500 (Class “A” flammability) HUSH FLEX™ enclosure with Insertion Loss per ASTM E-1222
View or Download Specification Docs
Hushcore Drawing
ATU
ZEN
4-6+dB(A)

Zenith

The HUSHCORE® Zenith™ System is the most complete multi-path solution for Air Terminal Units (ATU) available. This solution includes the HUSH FLEX™ removable cabinet wraps with HUSH DUCT™ silencers for ATU induction inlet and discharge noise attenuation.

Sample Installation Images

Zenith Highlights

  • HUSH FLEX™ removable cabinet wraps for cabinet radiated sound
  • HUSH DUCT™ silencers for open inlet/return and outlet/discharge noise
  • 4 to 6 dB(A) reduction of radiated sound
  • 4 to 6+ dB(A) reduction of inlet/return and outlet/discharge noise. Project
    Performance Driven
  • Model PWR-350 and PWA-500 (Class “A”) HUSH FLEX™ enclosure with
    Insertion Loss per ASTM E-1222.
View or download Specification Docs
Hushcore Drawing