The FDA series is DIDW centrifugal fans with forward curved impellers.
The fans are suitable for supply or extract applications in commercial, process and industrial HVAC systems.
Sizes of this series are in accordance with AMCA standard 99-0098-76 and DIN 323 R20.
The wheel of FDA series has forward curved blades manufactured in galvanised sheet steel.
For all sizes, the housing is manufactured in galvanized sheet steel with the housing fixed to the side plates in "pittsburg lock" form system.
The frame is manufactured with galvanized angular bars for type "C". For type "T" and "X", they are manufactured with sections of steel and finished with polyester powder coating.
Shafts are manufactured from C45 carbon steel using an automatic process for positioning and cutting of the keyways. All dimensional tolerances of the shaft are fully checked to ensure a precision fit and then coated with an anti-corrosion varnish after assembly.
Bearings used are either deep groove ball bearing type with an eccentric locking collar or an adapter sleeve, or spherical roller bearings type sealed at both sides for different duty application.
The bearings are lubricated for life and maintenance-free.
If re-lubrication is necessary, it is recommended to use lithium base grease suitable for all temperatures within the operational limits.
All wheels are statically and dynamically balanced to ISO1940 and AMCA 204 - G2.5 standards.
Special powder-paint coatings of various thicknesses can be supplied on request.