I ran across this in a practice problem from some 4.0 practice exams, and upon trying to find the correct answer have found a lot of variety. What is the CORRECT answer? (Correct, of course, being whatever NCARB tells us is correct.) Thanks in advance for the help!
From my ppi2pass PPD study guide:
DLH 52-96 in
From my ppi2pass PDD study guide:
DLH 52-72 in
From my 4.0 practice exam:
DLH 52-72 in
From Wikipedia:
DLH 52-120 in
From an actual steel joist manufacturer
DLH 120 in