Circular Fire Dampers (with Universal Plate Frame) – 180mm Diameter
Fire dampers contain a steel curtain held in the open position by a fused link.
The link will break once a certain temperature is reached and powerful springs pull the curtain closed.
Product PDF;
nca-series-100—product-datasheet
145668 - EM 125 EC 01 - 125mm Inline Tube Fan - Ruck
149-POT-10-MI - EC Electronic Controller - Elta
MBD EC 355 A - Helios - MegaBox EC-Centrifugal Fan 
