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AKH-R 400 Plenum Box Isolated

smoke extract fan


The plenum box is used in combination with the ceilling diffuser FD and DHD.A damper is included and the box insulated.  

Ordering code


Q = square

R = circular 


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 be adjusted from below. Up to size 625 the front panel is mounted to a profiled bar at the plenum box by one central screw. Size 800 is fixed by screws around the flange of the plenum box.

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!