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PrivacyShield® Plenum Return Silencer G2

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Return Policy: This product is non-returnable.

Typical Shipping Lead Time: 1-2 weeks; 20 or more will require additional time

Product Description

PrivacyShield Speech Privacy Without the Noise! Speech Privacy Without the Noise!

The PrivacyShield® Plenum Return Silencer G2 stops airborne sound transmission through ceiling grid air returns to increase speech privacy. As a component of the PrivacyShield® system, use this in combination with the PrivacyShield® Ceiling Tile Barrier and Light Hoods to prevent sound from flanking over interior partition walls. Unlike other speech privacy systems, like sound masking, creating a soundproof ceiling grid provides a better, long-lasting alternative without adding fatiguing noise.

By and large, open plenum ceiling grid systems are intended to provide a low-cost air return solution for office spaces and buildings. What is often overlooked is the need for speech privacy and sound control. An open-air return permits air to cycle into the plenum, but it also allows sound and conversations to pass with it. This is especially true when the partition walls do not extend up to the roof deck. To address this issue, something needs to be placed at the sound source to prevent this sound transmission.

As the next generation of air silencers from Acoustical Solutions, the unit was specifically designed to provide a solution to this problem. As the air and sound enter the silencer, it is presented with a tortured path of sound-absorbing material. Consequently, the sound is reduced and prevented from escaping to other rooms, while still maintaining airflow.

By soundproofing your grid, you can keep your conversations confidential and prevent annoying distractions that will lead to increased privacy and productivity as well as create a comfortable, relaxing space.

For use in standard 2′ x 2′ and 2′ x 4′ grids systems, the PrivacyShield® Plenum Return Silencer G2 is available for new or retrofit construction projects. Each shipment includes a pre-cut barrier tile backer, a vertical air chute with included 5″ corner extensions, and your choice of a standard hood or hood with a 1 lb. per sq. ft. barrier septum and tape for assembly.


Speech Privacy and Soundproofing for Private Offices, Conference Rooms, HR Departments, Legal Departments, and Medical Facilities. Noise due to rooftop units, HVAC, and other equipment.


  • Greatly improves speech privacy while maintaining air flow
  • Installs over existing air vent grill
  • Higher worker productivity & Improved worker morale
  • Reduced threat of corporate espionage
  • Compliance with HIPAA
  • Speech Privacy Without the Noise
Hood Section Core Options:
Standard 1 lb. Septum
PrivacyShield Light Hood Standard PrivacyShield Light Hood Septum

Standard STC of 5

(Best for Speech)

1 lb. Septum STC of 26

(Best for Music,
Mechanical noise)

Technical Information

  • Size: Fits into a standard 2′ x 2′ ceiling grid
    • Overall size: 31″ x 31″ base x 19″ height
  • Composition:
    • Hood Section: Fiberglass core covered on both sides with non-woven polyester rayon facing molded into a single piece acoustical hood with optional 1 lb Septum
    • Air Chute Section: Two-part, black molded fiberglass board with exterior fire-resistant foil scrim facing
    • Ceiling Tile Barrier: 0.12 inch (3.05 mm) woven polyester acoustic decouple facing adhered to a 0.12 inch (3.05 mm) mass loaded vinyl sound barrier with a 0.003 inch (0.08 mm) fire retardant fabric backing
  • Parts List: Air Chute, Hood, Ceiling Tile Barrier, Tape
  • Intended Use: To reduce the amount of sound that passes through an air vent, into and out of a ceiling plenum. This product is a component of the PrivacyShield® System that includes PrivacyShield® Ceiling Tile Barrier and PrivacyShield® Light Hoods.
  • Maximum air flow: 750 CFM (cubic feet per minute)
  • Operating Temperature per ASTM C411: 250 degrees maximum
  • Air Velocity per ASTM C1071: 5000 fpm (25.4 m/sec) maximum
  • Maximum Internal Pressure per UL 181: 2″ w.c. (498 Pa)
  • Fungi Resistance:
    • per ASTM C1338: Does not breed or promote
    • per ASTM G21: No growth
  • Bacteria resistance per ASTM G22: No growth
  • Water Vapor Transmission per ASTM E96: < 0.02 Perms
  • Water Vapor Solutions per ASTM C1104: <5% by weight
  • Fire Rating: Class 1 or A per ASTM E84 (UL 723)
  • NRC: 1.00 per ASTM C 423-09a/E 795-08/NVLAP 08/P03
  • Sound Transmission Loss (STC) Per ASTM E 90-09/NVLAP 08/P06
    • Hood Standard – STC: 5
    • Hood with 1 lb. Septum – STC: 26
Sound Transmission Loss (Hz) (per ASTM E 90-09)
Type 125 250 500 1000 2000 4000 STC
Standard 5 4 4 5 6 7 5
1 lb. Septum 16 17 21 25 33 40 26
Sound Absorption (Hz) (per ASTM C423-09a; E-400 Mounting)
125 250 500 1000 2000 4000 NRC
1.01 1.07 0.80 1.05 1.02 1.09 1.00

Installation Method

Please refer to the installation instructions posted in the Documents section of this page and watch this Assembly Video.

Construct this unit using the provided duct tape and place the unit in the ceiling grid on top of an existing perforated air return grill. To begin, assemble the two vertical air chute components into a square box, on top of the ceiling tile barrier mat, using the factory-installed peel-and-stick tape. If plenum height is not sufficient, the 19” high vertical hood supports may be cut down to a 13” height.

Square up the assembled air chute on top of the pre-cut ceiling tile backer (silver side up) and secure it to the ceiling tile backer with provided duct tape. Pass the completed air chute with barrier tile into the plenum and install on top of the existing perforated air return grill. Finally, pass the hood portion of the unit into the plenum and place on top of the installed air chute.

  • Maintain uniform temperature and humidity prior to, during, and after installation.
  • These installation instructions are a general guide to avoid common errors. Installer should follow best practices for construction and workmanship.
  • Do not install material of unacceptable quality.

prop 65 warning icon WARNING: This product can expose you to chemicals including glass wool fibers (inhalable and biopersistent) known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.

For more information on our PrivacyShield® Plenum Return Silencer G2,
call us at 800.782.5742 or contact our sales department.

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