Vent-Axia's Lo-Carbon Centra has been awarded the Quiet Mark by the Noise Abatement Society (NAS). It also featured in the Ideal Home Show's Quiet Mark "Quiet House" (March 15 – April 1 2013 at London's Earls Court). An exceptionally quiet fan with sound levels as low as 10dB(A), Vent-Axia says that the discreet Centra has tasteful styling and the versatility …