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KHAE... / KHAD... - Duct fans with backward curved centrifugal impellers

·    easy installation (DIN standard flange)
·    backward curved impeller
·    extremely low starting current
·    motor protection by thermal contact
·    speed is variable using auto transformers



The Rosenberg duct fans provide a distinctive advantage of axial fans,  i.e.  straight airflow and easy  installation,  high pressure stability, low noise level and high efficiency of the centrifugal fan.

Application areas:
Garage / Offices / Bars / Greenhouses / Skyscrapers / Hotels / Industrial buildings /  Basement rooms /  Playschool / Cinemas / Parking facilities / Warehouses /  Nursing homes /  Schools / Sports halls /  Supermarkets /  Workshops / Residential houses / Fitness centers / Inflatables

We distinguish between:
Variant W     =     efficiency optimized impeller
Variant WS    =     efficiency optimized impeller, sound attenuated duct fans
        The sound attenuated duct fans offer with a space saving and sound absorbing casing extremely low noise levels.

Reference to Directives:
 Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE identification in accordance to EMC-Directive 2014/30/EU, Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/125/EC.



Casings are made of galvanized sheet steel, formed as a rectangular duct, for direct installation into air ducts.  Mounting  possible  in  any  position.  Standard  flanges  are  installed  on  inlet and outlet side.
Equipped with complete swing-out motorized impellers for easy inspection  cleaning and  maintenance.



Impellers made of sheet aluminium (ALMg3)
The forward curved impellers are directly mounted to the rotor of the external rotor motor and are balanced dynamically together with the rotor according to quality level G2.5 to DIN1940.


Motor and motor protection:

All Rosenberg fans are  equipped with  direct driven  external rotor motors.  All our fans have motor protection  through thermal contacts in the motor windings as standard. The motors apply to protection class IP44/IP54.

Size KHAE 200-2 and KHAE 250-2W        = motor protection class IP44
All other sizes                    = motor protection class IP54

The drive has due to an external rotor motor a space saving, compact and attractive design. The motor is fitted within the impeller, which enables the best possible cooling. For this reason  a  100%  variable
speed control can be guaranteed. V-belts, additional tension bars and motor mounting devices are  not necessary.  Only well-dimensions ball-bearings,  fitted on both sides and  life  time  greased are  used.
Both ball-bearing seats are  ground to high  precision in one work process to eliminate  any  vibrations.
External rotor motors have extremely low starting currents.  The windings  comply to  isolation class F.
In addition the windings have a standard moisture impregnation.


Electrical connection:

The  motors  are  fitted  with  an  outgoing  cable.  The  electrical connection  can be made via an IP44 terminal box, which is supplied loose.

Direction of rotation
Direction of rotation is clockwise, viewed from the inlet side.



The  duct  fans  are  mounted with the desired accessory (duct silencer, filterbox, etc) in the ductwork.
To avoid  possible  vibration  onto the channel system,  we recommend the use of flexible connections (optional).


Air volume control:
For more information see accessories!

5-speed control unit:    
230V  à RTE …
400V  à RTD …

Infinitely variable control unit:
230V  à ED / REE …
400V  à RED …
400V  à Frequency converter / WARNING: up to max. 50Hz

2-speed control unit:
400V  à MSD 2


Scope of delivery:

·    Duct fan (KHAE / KHAD)
·    Terminal box (loose)
·    Documentation


Important notes:

Air performance curves:

The performance curves for these fan types have been measured in mounting position D (installed on the pressure side and open on the suction side)  and  show  the  total  pressure  increase ∆pt as a function of the air flow.  The  dynamic pressure ∆pd2 refers to the flange cross section at the outlet side of the fan.  

Noise levels:
The bordered values printed in the performance curve diagrams show the "A"  weighted LWA6 sound power level at the outlet side in duct systems. The relative octave sound power level LWArel at octave medium frequency you can find on type page.

Classification of the fan series:
NRVU    = Non Residential Ventilation Units
UVU    = Unidirectional Ventilation Units

Rosenberg fans have a spezfic (pressure-) ratio < 1,05 (pressure < 5000 Pa).

Service life:
For maximum service life of Rosenberg products please beware of the maintenance hints on the manual for each product type.

Recycling and disposal:
For recycling and disposal of Rosenberg products comply with applicable locally requirements and regulations.

Duct fans with backward curved impellers and swing out motorized impellers and sound absorbing casing

Casing made from galvanized steel, formed as a rectangular duct, for direct installation into air ducts. Mounting in any position possible. On inlet and outlet side 20 mms wide standard flanges.
KHA- 225-560 with backward curved high efficiency impellers made from seawater resistant aluminium. The SIGMA-silent KHA- 280 - 560 is in comparison with a standard fan extremely silent. Impellers are mounted onto a speed controllable external rotor motor. The fan is balanced on the levels according to quality level G 2.5 DIN/ISO 1940.

Closed motor, sizes 225,250,315,355 in protection class IP 44, all others in IP54. With protection against humidity and thermal contacts wired in windings for motor protection. Maintenance free ball bearings, closed on both sides, sealed for life. Electrical connection through terminal box (not connected) in IP 54.

Reference to Directives:
Declaration of incorporation and operating instruction are according to Machinery Directive 2006/42/EC, CE identification in accordance to EMC-Directive 2014/30/EU, Low Voltage Directive 2014/35/EU and the Ecodesign-Directive 2009/125/EC.

For further information, please click the model below for detail.

No sound absorbing casing With sound absorbing casing
KHAE 225-2.3CA W KHAE 315-4.4DA W   KHAE 315-4.4DA WS
KHAE 250-2.3EF W KHAE 355-4.4FF W   KHAE 355-4.4FF WS
KHAE 280-2 W KHAE 400-4.5FA W KHAE 280-2 WS KHAE 400-4.5FA WS
KHAE 280-2.5DF W KHAE 450-4.5HA W KHAE 280-2.5DF WS KHAE 450-4.5HA WS
  KHAE 500-4.6HF W   KHAE 500-4.6HF WS

Picture of Duct fans with backward curved impellers Swing out motorized impellers


Picture of Duct fans (sound absorbing casing) with backward curved impellers Swing out motorized impellers

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