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Return Air Grill Attenuator Model AA77134

The Return Air Grill Attenuator is designed for quick and easy installation into ceiling return air grills found in suspended ceiling grid systems. The AA77134 is used to acoustically treat open return air grills for soundmasking uniformity by attenuating the amount of sound that can pass through an “air-handling” ceiling grid at the point of the return air grill.

The AA77134 is installed above return air grills in ceiling grid systems that also handle HVAC flow. The AA77134 is sized for a standard 2 x 2 feet (0.6 x 0.6 m) return air ceiling grill. Its center perforation allows for the attenuator’s steel planes to pitch upward and create a deflective effect when an acoustical “hot spot” poses a uniformity problem. When properly installed the Return Air Grill Attenuator will attenuate as much as 10 decibels (dB) of sound. It is important to note that the AA77134 is effective only when properly installed.

This product is manufactured by the leader in soundmasking worldwide. They have been in business since 1975 and continue to be on the leading edge of soundmasking research. Applications for this product include commercial soundmasking applications in banks, law offices, police stations, secretarial areas, CPA firms, conference rooms, doctor’s offices, and many other applications where soundmasking is required.


    • 24-gauge Galvanized Steel
    • 8 to 10 dB reduction (when placed directly under 2 x 2 feet/0.6 x 0.6 m opening)
    • 3 to 6 dB reduction (when placed 2 to 6 feet/0.6 to 1.8 m from a 2 x 2 feet/0.6 x 0.6 m opening)
    • Maximum continuous load of 550 CFM at a velocity of 500 feet per minute
    • Dimensions: Standard 2 x 2 feet ceiling tile opening