We have a project with ESFR sprinklers near a roof deck and a large, round fabric duct (similar to "DuctSox") that is below the ESFR sprinkler. The round duct is as large as 6-foot diameter on one end, and gets down to as small as 3'-3" diameter on the opposite end (the run of duct is ~140 feet long).
The duct is almost perfectly centered horizontally between two ESFR sprinkler rows, and it is also located 6'-8" vertically below the sprinkler deflectors.
Is this duct considered an obstruction that would require sprinklers underneath?
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