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
Answer: C
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
Answer: C