Fire and smoke control requirements for air ducts include which of the following? Check the three that apply.

HVAC duct penetrations through fire/smoke rated assemblies require listed dampers and

control/sensing to limit spread of flame and smoke.

Fire dampers (D) close on heat to maintain the fire-resistance rating of penetrated assemblies.

Smoke dampers (A) limit smoke migration in smoke partitions/barriers and in smoke control systems.

Air-handler shut-down sensors (F) (e.g., duct smoke detectors interfaced with the FA system) stop

fans to prevent smoke distribution.

Not required: Balancing dampers (B) (for airflow only); Smoke barrier (C) (a wall/assembly

requirement, not a duct device); Variable-volume smoke controls (E) (project-specific engineering,

not a base requirement).

PDD refs: IBC Ch. 7 & 9; IMC §§607 (dampers) & 606 (smoke detection in ducts); ARE 5.0 PDD—

MEP/fire protection integration.