Model FSD-A is a multiblade fire and smoke damper with 3V style blades. It is designed for closure of the HVAC duct opening in emergency fire situations. It is certified to withstand fire conditions for 2 hours as well as 4 hours, as per UL555 testing standards , tested by CBRI Roorkee
Model FSD-A can be installed vertically , with blades running horizontally with airflow in either direction.
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