Advice for sound isolation in an appartment room

Does anyone know any good methods for isolating outside noise and minimizing sound leakage through vent grilles? Also, does anyone have experience with dusting & cleaning acoustic foam?

Thanks a ton.

These videos might help you a bit in understanding what might work for that (cause Iā€™m no expert but he is)ā€¦

In short, foam helps in treatment not noise.

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