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This infographic designed by Silence Air. Silenceair® International is a multi-award winning Australian company that was founded with the aim of creating cost-effective and sustainable solutions to the problem of providing acoustic-controlled fresh air for buildings in locations affected by noise. In our product collection we have 140mm Acoustic Vent, 140mm Acoustic Vent Premium, 240mm Acoustic Vent and many more

Source:  Ventilation In Apartment Buildings