Arrived at location on 7/16/21 - Looked at exhaust fan. Belt was in decent shape and tension was good. Drive pulley was grooved. Called distributor and got a price on a pulley. Spoke with chef and told him ballpark pulley price. He said go ahead and change it. Picked up pulley and new belt. Aligned pulley with straight edge and set sheave adjustment identical to old pulley. Tested fan. Rated 12 amps at 120v. Actual amps 10. Pulley has no more adjustment and fan cannot be sped up. Building is in a slight negative. If this doesn’t make a big enough improvement we will need to look at the buildings makeup air. Job complete.