When Are Fire Dampers Required in Ductwork?

Generally, fire dampers are required where air ducts penetrate walls that are rated for 2-hours or more. They are needed in all air transfer openings (non-ducted) in rated walls, regardless of the rating. And they are required at some, but not all penetrations of rated floor assemblies and shaft enclosures.

Where are fire dampers required?

Smoke dampers are required in air-transfer openings (an opening designed to allow the movement of environmental air between two contiguous spaces) in smoke partitions and in air transfer openings and duct penetrations in smoke barriers.

Are fire dampers required in a 1 hour ceiling?

1. Fire dampers are not required in ducted HVAC systems provided the wall is 1-hour fire resistance rated or less, occupancy is not Group H, and the building is equipped throughout with an automatic sprinkler system.