Fire Dampers
UL 555 classified 1½- or 3-hour fire rating
Fire Dampers
UL 555 classified 1½- 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 1½- or 3-hours. Fire dampers fall into two categories:

  • Dynamic rated – used with HVAC systems that remain operational during a fire emergency
  • Static rated – used with HVAC systems that shut down automatically during a fire emergency
Dynamic 1.5 Hour Rated Dampers
Dynamic 1.5 Hour Rated Dampers
UL 555 classified dampers for use in HVAC systems that remain operational during a fire; fire rating of at least one and one-half hours.
https://catalog-api.greenheck.com/api/category/en-us/seo/dynamic-1-5-hour-rated-dampers
Dynamic 3 Hour Rated Dampers
Dynamic 3 Hour Rated Dampers
UL 555 classified dampers for use in HVAC systems that remain operational during a fire; has a fire resistance rating of at least three hours.
https://catalog-api.greenheck.com/api/category/en-us/seo/dynamic-3-hour-rated-dampers
Static 1.5 Hour Rated Dampers
Static 1.5 Hour Rated Dampers
Used in HVAC systems that shut down automatically during a fire. The dampers have UL 555 fire resistance rating of one and one-half hours.
https://catalog-api.greenheck.com/api/category/en-us/seo/static-1-5-hour-rated-dampers
Static 3 Hour Rated Dampers
Static 3 Hour Rated Dampers
Used in HVAC systems that shut down automatically during a fire. The dampers have UL 555 fire resistance rating of three hours.
https://catalog-api.greenheck.com/api/category/en-us/seo/static-3-hour-rated-dampers