Standards for ventilation environments emphasize the need to ensure, in addition to the necessary air exchange, the best acoustic comfort in buildings. Sometimes in urban areas it is difficult to aerate the environments through external walls ventilation without incurring in the annoying noise of the city and its traffic. This makes it indispensable to have accessories that allow both ventilation and noise reduction in compliance with standards in use. The wide range of silencers and auxiliary reducers branded “La Ventilazione” brilliantly fulfill these needs. Phonobox, Helix43, Helix34 and Ufo are designed to allow natural air exchange through the ventilation holes in the building facades preventing the transmission of noise.