ISS-1039 · Northgate Logistics Center · HVAC Equipment & Installation
Ductwork routing conflict with sprinkler main at Grid F-6
Raised by Tomas Reyes (Evans General Contractors) on 2026-08-06
Coordination model shows the 48x18 supply trunk clashing with the 6" sprinkler main between grids F-5 and F-6. Need a resolution approach before overhead rough-in starts on 8/31.
Proposing a transition to 60x14 for the run between F-5 and F-6 to pass beneath the sprinkler main. Sketch attached.
Ron Borden · 2026-08-11
60x14 keeps velocity under 1,800 fpm — acceptable if the transition stays outside 3 duct diameters of the takeoff.
Tomas Reyes
Requester · Evans General Contractors
Ron Borden
Responder · Apex Mechanical Systems
Imani Foster, PE
Reviewer · Lowcountry Design Group
Created issue
Tomas Reyes · 2026-08-06 07:55
Submitted response
Ron Borden · 2026-08-11 10:20
Proposed transition to 60x14
Requested more information
Tomas Reyes · 2026-08-12 16:31
Need EOR concurrence on velocity
Clash-Report-F6.pdf
640 KB · Tomas Reyes · 2026-08-06
Duct-Transition-Sketch.pdf
412 KB · Ron Borden · 2026-08-11