Centrifugal or Extractor Fan? 1.8 x 1.2 vocal booth

Hi guys, great to be on board this site, We have just built a booth, and now wondering best way to get extractor fan in? and if anyone knows where to get ones with soundproof box in New Zealad?? What is the best and most easiest way to get ventilation in Our design is: 1.8 x 1.2 x 2.3, Noiseline Gib, Pink Silencer bats, Noiseline Gib and then using Autex panels for interior. Thanks