I have a plan reviewer that is requiring seismic bracing on small cross section ductwork. They are citing ASCE 7-10, 13.6.7 Ductwork. I believe exception #2 is exactly what we have. They are saying that somehow we need to satisfy both exception #1b and #2. Our ductwork is small diameter with the largest being 24".
We are under the impression that seismic bracing is required for ductwork greater than 6 SF in area and on hangers greater than 12" in length.
What are your interpretations? Are there any commentaries on this for clarification?
We are under the impression that seismic bracing is required for ductwork greater than 6 SF in area and on hangers greater than 12" in length.
What are your interpretations? Are there any commentaries on this for clarification?