We have an auditorium with a stage area. The stage area is fully sprinklered and provided with four natural smoke vents at the roof.
Below the smoke vents at a depth of almost 10-feet (3 meters) there is structural steel frame (provided for structural stability) arranged with narrow gap of only about 1-inch (30 mm) and obstructing all the smoke vents. We understand this steel frames will deflect the smoke plume and affect the performance of smoke vents.
Is there a standard/code reference regarding how to include this obstruction in the calculations and to prove to AHJ that the smoke vents would still be sufficient?
Thanks in advance.
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7/13/2020 10:02:56 am
I am unaware of any standardized obstruction rule similar to that of sprinklers that applies to a smoke control system. I would look at the Handbook of Smoke Control Engineering and the SFPE handbook.
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