https://www.lbfans.co.uk/product/squ2-4-3-qube-centrifugal-box-fan-elta/
SQU2/4-3 - Qube Centrifugal Box Fan - Elta | L&B Fans & Ducting Store
Aug 9, 2024 - SQU2/4-3 - Qube Centrifugal Box Fan - EltaA multi-discharge, double skinned fan unit incorporating a high performance backward curved impeller.