Pari Infra Industries Pvt. Ltd. Fire dampers automatically interrupts airflow through part of an air system to restrict the passage of flame. There are two basic types of fire dampers: Curtain (also called guillotine) and Multi – blade. Typically, the basic curtain types without spring assist are dynamic rated and available for horizontal mounting. Multi – blade fire dampers are dynamic rated and have a tension spring that closes the dampers when a fuse link separates.
All fire dampers are held in the open position by a fuse link. This link separates at a specified temperature, releasing the blades to close, either by gravity or spring assist. If the temperature in the system climbs above 165®F (74® C), the fusible link melts, allowing the high torque spring to close and lock the damper blades. A 212® F (100® C) fusible link in optional.
Pari Infra Industries Pvt. Ltd. have two major ratings available for fire dampers,Static or Dynamic closure and 1-1/2 or three – hour integrity. Static fire dampers can only be used in HVAC systems that shut down during a fire. Temperature relates to the point where a fuse link or other device will release the damper from open to closes position. Dynamic fire dampers are rated to close while the HVAC system remains running during a fire event. The dynamic rating carries both a pressure differential (inch wg.) and velocity (fpm) rating. Dynamic fire dampers can be applied in all HVAC system.
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