While I was a sheet metal mechanic my boss asked me to come up with a plan and schedule to install 14 6' diameter exhaust fans. I started by recruiting 4 dependable guys I knew would help and not hinder the install. I decided to hang the fans using a series of chain falls to lift the fans and pull them into place at the same time. After we had the fan in place we fastened it with bolts to the side of the filter house and hung it from 1/2 " threaded rod. Complete success.