I've posted this incident before. When I was on a large construction site for a Sappi paper mill, in the sticks in South Africa in the 70's, 4 English engineers from Beloit Whalmsley - a paper machine builder, were burned alive in the early hours, when all were staying in one of many residential caravans. It was thought that the cause was a stalled, wall mounted, kitchen extract fan: this was clogged up with grease. I think that nowadays these fans with synchronous motors are protected from stalling.
I've posted this incident before. When I was on a large construction site for a Sappi paper mill, in the sticks in South Africa in the 70's, 4 English engineers from Beloit Whalmsley - a paper machine builder, were burned alive in the early hours, when all were staying in one of many residential caravans. It was thought that the cause was a stalled, wall mounted, kitchen extract fan: this was clogged up with grease. I think that nowadays these fans with synchronous motors are protected from stalling.
