Model FSD-B-U is a UL555 and UL555S classified multi-blade combination fire and smoke damper with 3V style blades, designed to close the HVAC duct opening in fire and smoke situations.
It is UL555 classified to withstand fire conditions for 1.5 hours and is Class 1 leakage rated under UL555S at an elevated temperature of 350° F. It can be installed vertically, with blades running horizontally and airflow in either direction.
Model FLD-S-U is a UL 555 classified fusible link multi-blade fire damper with 3V style blades, designed to close the HVAC duct opening in fire situations.
Model FLD-S-UD is a UL 555 classified fusible link multi-blade fire damper with 3V style blades, designed to close the HVAC duct opening in fire situations.
Model SD-A-U is a UL555S classified multi-blade smoke damper with 3V style blades, designed to close the HVAC duct opening in smoke situations.
Model SD-B-U is a UL555S classified multi-blade smoke damper with 3V style blades, designed to close the HVAC duct opening in smoke situations.
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