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.
It is Class III leakage rated under UL555S at an elevated temperature of 350° F and is designed for velocities up to 2000 fpm at 4” w.g. pressure. It can be installed vertically, with blades running horizontally and airflow in either direction.
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.
Model FSD-A-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.
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.
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.
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