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FD-R 400 Diffuser Round Fix

smoke extract fan


The DHD is a highly inductive swirl diffuser with either square or circular front plate and fixed swirl diffuser blades manufactured from steel. To be used with a plenum box.

Ordering code

FD-R 625

FD swirl diffuser

R = circular front plate

Size of the front plate

AKH-R 625

Plenum box incl. damper and insulation

R = circular

Size of the front plate


Diffuser with fixed blades guiding the air, blades in a circular shape. High induction by special shape of the blades and blade arrangement. The blades separate the air stream into an amount of single, highly inductive air jets, in order to have a quick temperature adjustment and reduction of air speed. Can be used for warm and cold air for temperature difference of 10 K.  


The FD is manufactured from powder coated steel (RAL 9010) and is available insizes 400, 500, 600 and 625mm. The plenum box is manufactured from galvanized steel and contains a perforated flow straightener, an adjustable air damper and a non-flammable insulation.


The plenum box is suspended from the ceiling (4 loops). The air damper can beadjusted from below. The front panel is mounted to a profiled bar at the plenum box by one central screw. The minimum mounting height (front plate) is 2.6 m, the maximum mounting height is 4 m.

Our products

NGM Company is one of the largest suppliers of fans for use in various building ventilation applications.

NGM Company supplyes our clients with a full range of air terminal devices.

Regulating efficiently the natural environment, NGM Company's units can create silently the perfect indoor conditions; your conditions!