In meeting federal specifications, insulated units must have the following fire-resistant minimum ratings:

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answerhappygod
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In meeting federal specifications, insulated units must have the following fire-resistant minimum ratings:

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In meeting federal specifications, insulated units must have the following fire-resistant minimum ratings:

A. Class 150: two hours
B. Class 150: four hours
C. Class 350: one hour
D. Class 350: three hours
E. Class 350: four hours
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