Series 75 Type C Fire Damper FAQs
What does a Type C style fire damper mean for airflow?
Type C fire dampers are engineered with the blades and frame completely out of the air-stream when fully open. This specialized design provides 100% free area velocity, minimizing system pressure drop and completely eliminating airflow restriction.
What is the difference between a Type A and a Type C fire damper?
Type A fire dampers have their interlocking blades resting directly inside the duct opening, which slightly reduces the total free area. Type C dampers pull the blade pack completely out of the frame profile, making them ideal for high-velocity or high-efficiency commercial HVAC systems.
Can this Series 75 Type C damper be used in a dynamic HVAC system?
No, this model is exclusively certified for static installations where the system blower fans automatically shut down immediately when an emergency alarm triggers. It relies on gravity to close during a fire and is not built to snap shut against active system velocity.
What collar transitions are available for this Type C damper?
The Series 75 Type C frame profile is built to seamlessly accommodate round, oval, or rectangular duct configurations, allowing for clean, leak-resistant sleeve transitions into different duct shapes.
Are these Type C fire dampers UL certified?
Yes, these static fire dampers are fully UL Classified under UL 555 standards with a 1-1/2 hour fire rating, providing complete structural compliance for local building inspectors and national NFPA 90A fire safety regulations.
