Sound Control Door Assemblies (08 34 73)
Bulletproof Barrier System at The Healing Center of San Diego (Jun 17, 2019)
Shielded Wall Systems from Ray-Bar Engineering Corporation (May 15, 2019)
Lead Free Shielding from Ray-Bar Engineering Corporation (Jan 16, 2019)
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For other relevant searches, you might want to try: sound control door assemblies; sound retardant door assemblies; door and frame assemblies with specific characteristics to exclude sound when closed.