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Axial wall and duct fans – AX.



tl_files/Lufberg/fotky2/axd.png     tl_files/Lufberg/fotky2/axw.png

Basic features

  • Air flow up to 9300m3/h
  • Motor protection IP 44
  • Voltage controllable
  • Integrated thermal protection



Fully controlled, axial fans AX are designed to be integrated in round duct ventilation duct system or mounted on wall. They can be universally used for simple ventilation installations.

AX fans are designed for indoor operation for conveying fresh air free of rough dust, grease, chemical fumes and other impurities.


Quick selection


Installation and assembly

AX-D fans are designed to be integrated in ventilation duct system. Fans can be installed in any position and  fixed on duct flange with screws.  In case other installation (with free inlet or outlet) installer has to prevent possible injury of rotating impeller.

AX-W fans are designed to be instaled on the wall for extracting of air in outdoor environment. Usualy on oposite site of wall is louver. In case instalation without louver or if  there is risk of injury of rotating impeller instaler has to prevent it

Allowed temperature range in environment  (place of instalation) is from -30 °C up to +60 °C, relative humidity up to 90%.

Allowed temperature of transported air is from -30 °C up to +60 °C.

Outdoor applications are possible only if AX fan is protect against outdoor weather conditions (rain, snow and sun shine).  For outdoor applications it is necessary to finish the fans with a protective coating (except labeling)against air humidity and outdoor conditions.

All oudoor instalations and non standard features of transported air must be discused and confirmed by producer  or authorized dealer.

In any case instalation it must be done so that there is enough space for acces in terminal box and fan disassembly from wall or duct system.  In case fan instalation in duct system it must be short ducting without many elbows. For long complicated duct systems are more suitable centrifugal fans RL from our product range.


Detailed description

Dimensional Range

AX fans are manufactured in a range of many sizes according to the standard HVAC duct dimensions. AX-D fans are equiped with flange for easy instalation in duct and AX-W fans are equiped with base plate for wall instalation. The standard dimensional and performance range enables optimize all parameters for air flow up to 9 300m3/h.

Construction and materials

Fan bodyes and impellers are made from steel and painted with epoxyd color. Motors are made of aluminium alloys, copper and plastics. All materials are designed in acordance with fan usage, maximum durability and minimal maitenance.


Impeller blades has optimized shape for maximal air transport efficiency and minimal aerodynamic noise  Impellers are perfectly statically and dynamically balanced. Proper direction of the impeller rotation must be checked after instalation and connection on power suply. Correct direction of rotation is marked on fan body.


AX  fans are equiped with energy saving single-phase and three-phase asynchronous motors with an external rotor and a resistance armature. The motors are situated inside the impeller and during operation are optimally cooled by the flowing air. The motors have high quality enclosed ball bearings with permanent lubricating filling enable the fans to reach above 30,000 operating hours without maintenance.

The motor electric protection is IP 44 and insulation class is B. The motor windings are impregnated to provide them with additional protection against moisture.

For motor protection (overheating) are used thermal contacts situated in the motor winding. The thermo-contacts are miniature bimetal switches which after being connected to the protective contactor circuit protect the motor against overheating (damage) due to any reason. Three phase fans thermal protection by means of thermo-contacts is comprehensive and reliable providing they are correctly connected. One phase fans has internaly wired thermo-contacts and in case over heating fan automaticaly stop. After fan cool down is starts automaticaly. Thermal protection by means of thermo-contacts is essential especially for motor:

  • that are speed controlled by voltage
  • that are operated with excessive switching frequency
  • that are seized
  • that are highly thermally loaded by hot transported air
  • whose cooling has been changed

Therefore, the fan motors cannot be protected by conventional thermal protection ensured by the motor overcurrent protective elements!

Electrical Equipment

All fans are equiped with wired connection cable. Single-phase motors are equipped with a starting capacitor which are in delivery. For wiring diagrams, see detailed information for each fan type and size in technical catalogue.


Fan up to diameter 250


Type of fan Dimensions [mm]
øA øB C D E øF øG øI øL
AX…200-4E 203 210 260 312 52 260 205 250 222,5
AX…250-4E 250 260 320 370 90 320 250 306 285


Fan from diameter 300


Type of fan Dimensions [mm]
øA øB C D E øF øG øH øI J K øL øM
AX…300-4E 315 325 380 430 90 380 4x M8 4x 7 382 8 180 357 8x 9,5
AX…350-4E 350 360 435 485 90 415 4x M8 4x 10 421 9 180 395,5 8x 9,5
AX…400-4E 400 410 490 540 110 470 4x M8 4x 10 466 9 190 437 12x 9,5
AX…450-4E 450 460 535 575 110 520 4x M8 4x 10 515 9 190 489,5 12x 9,5
AX…450-4D 450 460 535 575 110 520 4x M8 4x 10 515 9 190 489,5 12x 9,5
AX…500-4E 500 510 615 655 115 580 4x M8 4x 10 567 9 250 542 12x 9,5
AX…500-4D 500 510 615 655 115 580 4x M8 4x 10 567 9 250 542 12x 9,5
AX…550-4D 560 575 670 725 115 650 4x M8 4x 10 635 9 250 606 16x 10
AX…630-4D 630 645 750 805 125 730 4x M8 4x 10 705 9 250 675,5 16x 11
AX…630-6D 630 645 750 805 125 730 4x M8 4x 10 705 9 250 675,5 16x 11



The output of all AX fans can be fully controlled by changing the speed. The fan's speed is changed depending on the voltage at the motor terminals.

More stage voltage control (transformer) of single-phase and three-phase AX fans is the most suitable, technically as well as operationally. There is no interference, humming, squeaking or vibration of the motor. For suitable type of controller see detailed information for each fan type and size in technical catalogue.

Motor cannot be controlled by frequency converter.

Thermal contact of three phase fan must be connected in to the protective contactor circuit which manage disconecting fan from power suply.