A door in a 1-hour rated wall needs to be:

 

A door in a 1-hour rated wall needs to be:

a.     1-hour rated

b.    45-minute rated

c.     30-minute rated

d.    Non-rated with an automatic closer

Scroll down to see the answer.

Answer: b. 45-minute rated

Gang Chen, Author, AIA, LEED AP BD+C (GreenExamEducation.com)