High quality and low price dampers hvac Electric fire damper

In HVAC systems, electric fire dampers are crucial components designed to prevent the spread of fire and smoke through ductwork. Here’s a breakdown of their function, types, and applications:

1. What is an Electric Fire Damper?

An electric fire damper is a device installed in HVAC ducts that automatically closes when triggered by a fire alarm or high temperatures, blocking flames and smoke from spreading to other parts of a building.

2. How It Works

Activation:

Electric Release: Connected to a fire alarm system, the damper closes when power is cut (failsafe) or when a signal is sent.

Thermal Fusible Link: Some models also have a heat-sensitive element that melts at high temperatures (typically 165°F/74°C or higher), causing the damper to close mechanically.

Operation: A motor or spring mechanism shuts the damper blades when activated.

3. Types of Fire Dampers

Static (Non-Combination) Fire Dampers: Close to stop fire/smoke but do not restrict airflow when open.

Dynamic (Combination) Fire Dampers: Can withstand airflow pressure (used in systems with fans that may continue running during a fire).

Smoke Dampers: Often paired with fire dampers to control smoke migration (activated by smoke detectors).

4. Applications

Installed in fire-rated walls/floors where ducts penetrate.

Used in commercial buildings (hospitals, schools, high-rises) per NFPA 90A, IBC, and local fire codes.

Commonly found in supply, return, and exhaust ducts.

5. Electric vs. Pneumatic vs. Spring-Return

Electric: Uses an actuator/solenoid; ideal for integration with building fire alarm systems.

Pneumatic: Uses air pressure (less common today).

Spring-Return: Mechanical, closes when a fusible link breaks.

6. Testing & Maintenance

Required annually per NFPA 80 & NFPA 105.

Check for:

Proper closure (no obstructions).

Electrical connections (if applicable).

Fusible link integrity.