What type of metal is typically used for the springs of fire dampers?

Fire dampers are critical components in HVAC systems, designed to prevent the spread of fire and smoke through ductwork by automatically closing when they detect high heat. The springs used in these dampers must have specific properties to ensure reliable performance in extreme conditions.

Stainless steel is the ideal choice for the springs of fire dampers due to its exceptional resistance to high temperatures and corrosion. In the event of a fire, the springs must maintain their structural integrity to effectively close the dampers. Stainless steel not only withstands the heat associated with a fire but also has a longer lifespan compared to other metals, ensuring that the damper functions correctly when needed.

While aluminum is lightweight and resistant to corrosion, it does not possess the same level of heat resistance required for fire dampers. Copper, while also corrosion-resistant and durable, is not typically used in applications where high heat and fire resistance are vital. Carbon steel, although strong, is prone to rust and lacks the high-temperature resistance needed for effective fire damper springs.

Thus, stainless steel is the most suitable material for the springs of fire dampers, ensuring they can perform their safety function in case of a fire.