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Sound getting in supply vents

General Home Theater & Media/Game Rooms - www.avsforum.com
I have a large open media room. 27x30 roughly. 5/8" drywall ceiling 1/2" walls r19 ceilinf r13 walls. Sound not bass tho is deadened decently. Except for the main supply and return air duct trunk that is dead center of our space. Sound is getting into 2 supply vents directly off the main trunk. Anyone know of a product i couod use to safely plug the supply vents with and then cover with my metal vent covers to keep the function if i want to unplug? I was going to cut some foam board to fit but i am not sure . I also dont want to create any condensate issues or anything by having an object stuffed in unless thats not an issue?


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