The SSAK 150mm to 100mm Adapter plate enables 100mm (4\") simply silent contour constant volume fans to be installed in place of a traditional exsisting 150mm (6\") Extract Fan. The SSAK adapter Kit offers a quick fit installation solution to enable a smaller, more compact energy efficent constant volume fan without loss of kitchen extract performance. The wall adaptor kit comprises of a rigid galvanised metal wall plate and a white plastic moulded square fasciacover with pre drilled fan fixing centres, screws and fitting instructions.