vertical duct riser support: do not hang the whole stack from one point hangers, supports, anchors & trapezes vertical duct riser support shaft stack support angle floor clamp support the riser at the locations and with the hardware shown on the engineered or approved detail, accounting for duct weight, fittings, insulation, and thermal movement. a riser concentrates large vertical loads and can settle, buckle, separate, or overload structure if the support scheme is wrong. engineered riser-support detail, structural drawings, approved shop drawings, foreman/engineer direction which supports carry the vertical load on this riser, which are guides, and what approved detail controls each floor?