These two pictures were taken by a hood and duct cleaner in May of 2017. In the first picture, you can see the fan opened to a 90-degree angle. It is being held open by two chains, one which is taut and the other slack. The slack chain isn’t helping to hold the fan open, leaving all the stress on the taut chain.
A few minutes after the first picture was taken, the chain broke and the fan crashed to the roof. Thankfully, the service person wasn’t injured. It got his attention though. He said he almost jumped out of his boots! No one was hurt – this time – but the fan and roof suffered damage. This dangerous situation could have been avoided if a proper sized hinge with a hold open retainer was in place instead of the non-compliant chain. This restaurant tried other cost cutting measures that didn’t pay off. You can see grease and sludge surrounding the fan and eroding the roof, with an ineffective pickle bucket as a so-called grease containment system.