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Fire Dampers

UL 555 classified 1陆 or 3 hour fire rating

Building codes require fire dampers to maintain fire resistance ratings of walls, partitions, barriers, and floors when penetrated by ducts or other air transfer openings. Fire dampers are UL 555 classified with a fire resistance rating of 1陆 or 3 hours. Fire dampers fall into two categories:

  • Dynamic rated 鈥� used with HVAC systems that remain operational during a fire emergency
  • Static rated 鈥� used with HVAC systems that shut down automatically during a fire emergency

Dynamic 1.5 Hour Rated Dampers

UL 555 classified dampers for use in HVAC systems that remain operational during a fire. The dampers have a fire-resistance rating of 1½ hours.

VIEW Dynamic 1.5 Hour Rated Dampers
https://catalog-api.greenheck.com/api/category/en-us/134

Dynamic 3 Hour Rated Dampers

UL 555 classified dampers for use in HVAC systems that remain operational during a fire. These dampers have a fire-resistance rating of 3 hours.

VIEW Dynamic 3 Hour Rated Dampers
https://catalog-api.greenheck.com/api/category/en-us/127

Static 1.5 Hour Rated Dampers

UL 555 classified dampers that shut down automatically during a fire. The dampers have a fire-resistance rating of 1½ hours.

VIEW Static 1.5 Hour Rated Dampers
https://catalog-api.greenheck.com/api/category/en-us/132

Static 3 Hour Rated Dampers

UL 555 classified dampers that shut down automatically during a fire. The dampers have a fire-resistance rating of 3 hours.

VIEW Static 3 Hour Rated Dampers
https://catalog-api.greenheck.com/api/category/en-us/130