The actuation device of fire dampers shall be temperature rated at what Fahrenheit?

The actuation device of fire dampers shall be temperature rated at what Fahrenheit?

• A. 250F
• B. 500F
• C. 450F
• D. 375F

Answer: (D)

The key idea is that the mechanism that drives a fire damper must stay functional under high heat so the damper can close and block the spread of flames and smoke during a fire. The actuation device is rated to withstand and operate at 375°F, which (~190°C) is high enough to remain reliable for the duration of typical fire exposure. Ratings lower than this risk the actuator failing or seizing before the fire is contained, while higher ratings aren’t required for this purpose. So 375°F is the specified minimum to ensure dependable operation of the actuator in fire conditions.

The key idea is that the mechanism that drives a fire damper must stay functional under high heat so the damper can close and block the spread of flames and smoke during a fire. The actuation device is rated to withstand and operate at 375°F, which (~190°C) is high enough to remain reliable for the duration of typical fire exposure. Ratings lower than this risk the actuator failing or seizing before the fire is contained, while higher ratings aren’t required for this purpose. So 375°F is the specified minimum to ensure dependable operation of the actuator in fire conditions.