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Message: <blockquote data-quote="dennishoddy" data-source="post: 3235686" data-attributes="member: 5412"><p>We came up with that technique when we had to go into heat treat furnaces at Smith Tool to re-brick and repair. Even after three days of cooling off, it was still 150+ degrees inside. We got a local heat and air company to build a plenum on the front of a swamp cooler then attached a tube to blow into the furnace and had a local ice company bring in 20 lb blocks to put in the bottom. The guys inside eventually called us on the radio and asked if we could shut it off for a bit as they were freezing in there.</p></blockquote><p></p>