Because the room needs to be sound-proof, in the simplest sense, this means that the room must also be air-tight. Obviously, an air-tight room is not practical, so ventilation has to be achieved without compromising the sound proofing. There are three principles that must be followed here:

1. Always aim to move a large volume of air slowly, rather than a small volume of air quickly.
2. The inside surfaces of the duct should be non-reflective. This is to damp any inte...
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The inline fan is a Vent Axia ACH-100 that has been mounted on a sheet of foam insulation sandwiched between two sheets of chipboard to provide some insulation. The idea here was to prevent the vibration from the fan being transmitted back down into the room.

  Fan standing on the chipboard and foam platform