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I worked in a shop with occasional needs for large vacuum forming. Our oven was made from fireproof panels and light metal angles. It would take a 4 X 8 on edge. It was hung from I-beam drapery track so it could be wheeled right out on those little rollers. The heat came from a motley collection of electric elements on the bottom. The key to getting good parts instead of scrap was the addition of a blower, re-assembled with the fan inside and the motor outside to vigorously circulate the air.
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There is no excuse for a land vehicle to weigh more than its average payload.
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