The problem is at the back of the fridge where there is a large amount of foam insulation, which is highly flammable.

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The entire process takes place in near-freezing conditions and such plants are usually built with large amounts of flammable foam insulation to maintain a constant temperature.

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Less successful but still profitable is Pittsburgh Corning, a joint venture with PPG Industries, that makes foam glass insulation and architectural glass blocks.

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Most of the victims died after inhaling the toxic smoke produced when ceiling insulation foam caught fire.

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All of the 241 victims were found to have died of asphyxiation as toxic fumes from the insulation foam quickly spread through the club.

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