A HVAC duct fire damper is a device that is designed to prevent the spread of fire and smoke through a building’s air ducts. It is an important component of any building’s fire safety system and is usually installed in the ductwork of a building’s heating, ventilation, and air conditioning (HVAC) system. Fire dampers are typically made of steel and are designed to close automatically when a fire is detected. This prevents the spread of smoke and fire through the air ducts, which can be extremely dangerous. Fire dampers are tested to ensure they are able to withstand the high temperatures of a fire and will close quickly when the temperature reaches a certain level. They are also designed to be resistant to corrosion and are usually installed in pairs, with one damper at the top and one at the bottom of the duct. HVAC duct fire dampers are an essential part of any building’s fire safety system and should be inspected regularly to ensure they are functioning properly.