Skip to main content

Fire door time ratings

An exterior wall with a 2 hour rating requires a door assembly rating (standard door test NFPA 252) of 1 1/2 hours. If the exterior wall rating is increased to 3 hours, what is the required door assembly rating?
A. 1 1/2, B. 2
C. 2 1/2, D. 3



A. 1 1/2 is correct. Only a partition used as a fire wall or fire barrier rated above 2 hours requires a door assembly rating greater than 1 1/2 (3 hour door req'd). An exterior wall would not separate another occupancy from the door opening.
are-review.blogspot.com

Comments

Post a Comment

Try These Too!

Bolted connections

What is the minimum spacing of bolts specified by AISC? and preferred spacing? A. 1 1/4 times the diameter of the bolt; 2 times preferred B. 1 3/4 times the diameter of the bolt; 2 1/4 times preferred C. 2 1/3 times the diameter of the bolt; 2 2/3 times preferred D. 2 2/3 times the diameter of the bolt; 3 times preferred E. 3 times the diameter of the bolt; 3.25 times preferred
Post a Comment
See the answer »

Roof pitch

Which one of the following slopes in this illustration corresponds with an 8:12 pitch roof? A. 45° B. 36.87° C. 33.69° D. 26.57°
Post a Comment
See the answer »

Zoning terminology

What is the term for the maximum three-dimensional space on a zoning lot within which a structure can be built, as allowed by applicable height, setback and yard controls? Answer Zoning envelope or building envelope.
Post a Comment
See the answer »