General Instructions    




  • During off-loading inspect fans for damage. 
  • If the casings, cowls or impellers are damaged, notify your local AMS distributor immediately. 
  • AMS cannot be held responsible for any loss of damage incurred to goods during transport, off-loading or on site.

Site Storage

  • The fans must be stored in a clean, dry protected and vibration-0free area. 
  • The fan impellers should be rotated daily to prevent bearing damage.


  • Install fans and accessories to allow service access for maintenance and for the replacement of assemblies and component parts, without disturbance of other items of plant and building elements.
  • Most motors are fitted with sealed-for-life bearings which are maintenance-free.
  • It is recommended that fans be inspected initially at 3-monthly intervals, to clean the blades and motor and to check for tightness of fastenings.
  • Where fans are used for kitchen exhaust or other applications where the air contains high amounts of dust, residue and other contaminants, fans should be cleaned and maintained at more frequent intervals appropriate for the application.
  • Motor overloads/contactors should also be inspected to ensure correct operation.
  • Should external lubricators be fitted, please refer to LUBRICATION INSTRUCTIONS in the 'Installation and Maintenance' instructions included with each fan.
  • If the fans are belt driven, check pulley alignment and belt tension before starting the fan.
  • Belt tension must be checked 2 - 4 weeks after start-up.


  • All standard motors are suitable for operation in air temperatures between -20°C and +40°C.
  • If higher temperatures are required, contact your local AMS supplier.
  • Standard motors are not suitable for handling saturated air containing water droplets or for some corrosive fumes.
  • For severe applications, special motors and finishes may be required.
  • Customers are requested to discuss these applications with our sales engineers to ensure a fan suitable for the application is selected.
  • WARNING - Failure to do so could void warranty. 




  • Read the fan serial plate to determine the number of phases and amperage drawn by the unit.
  • Check that the available supply is suitable. 


  • All fans must be earthed in accordance with the latest Machinery and Safety Occupational Act.


  • Wiring must be in accordance with the latest Machinery and Safety Occupational Act.
  • Wiring diagrams are provided on all fans.
  • These will be found inside the fan terminal box.
  • Copies of wiring diagrams are shown on pages I-6/9.


  • All three-phase motors must be provided with differential action, single-phasing protection and overload current protection.
  • Failure to provide single-phasing protection will void warranty. 
  • Motors fitted with thermistor or thermostatic protection should have these wired into the starting contactors' control circuit to interrupt motor power supply on winding temperature rise. 
  • Wires marked 'TK' are for internal thermal contacts which should be wired directly into the contactor controller circuit.
  • Failure to connect thermal protection devices will void warranty.

Direction of Rotation

  • If backward-curved centrifugal fans rotate in the wrong direction, the motor may overload, and the motor warranty will be void.
  • To change the direction of rotation on three-phase motors, interchange any two supply leads.
  • All single-phase motors will rotate in the correct direction when correctly connected.


  • All fans are suitable for direct-on-line starting by switch or automatically by contactor up to and including 5.5kW.
  • The number of starts should be limited to no more than four per hour or, in the case of motors of less than 1kW, no more than eight starts per hour.
  • This would be subject to local supply regulations. 

Check List

  • check power supply
  • check fan is free to rotate
  • check overloads are fitted
  • ensure ductwork is free of debris
  • check rotation of fan
  • check the motor amperage draw does not exceed nameplate rating 



Rotating fan impellers can be a danger to personnel.

The following precautions must be taken: -

  • electrically isolate the fan motor prior to undertaking any work.
  • regularly check impeller fasteners for tightness.
  • where fans are accessible to personnel or directly exposed to habitable areas, it is the responsibility of the installers to ensure that fans will have guards which comply with the latest Machinery Act
  • prior to fan start-up, ensure loose debris will not be sucked into the fan. All ductworks should be clean.


Installation Instructions 


Important Notes:

  • With all horizontally mounted axial fans it is preferable that the fan is installed with the motor mounted on top of the motor plate. i.e. not suspended under the motor plate.
  • For outside installations, IP66 rated conduit and fittings must be used.
  • To obtain rated performance, the following recommendations should be followed: -

Duct Mounted Fans - General

  • inlet and outlet ductwork should be free from obstructions.
  • duct transitions should be 60° inlet/15° outlet.
  • avoid sharp bends on inlet or outlet.
  • do not use ductwork smaller in area than the fan.
  • flexible duct connections should be taught.
  • ductwork connections should be well aligned.
  • inlet cones must be fitted to free inlet applications.
  • ensure that the fan orientation is correct for the required air flow direction.

Belt-Driven Product

  • pulleys must be correctly aligned.
  • belts must be correctly aligned and tensioned.
  • tension must be checked 2-4 weeks after start-up.

Roof Ventilators

  • ensure that upstands are flat and true.
  • fix a sealing strip of neoprene to the top of the upstand to prevent air leakage.
  • fit an electrical compression gland to the roof cowl in an appropriate location and pass the electric cable through as the roof cowl is fitted.
  • ensure the electric cable is not pinched prior to securing the cowl to the upstand.
  • the roof cowl should be secured with roofing screws through the side skirt midway through the skirt.
  • inlet ductwork should be free from obstructions.
  • avoid sharp bends at the inlet.
  • vertical discharge axial roof units: ensure the damper flap hinge points down the slope of the roof. 

Lubrication Instructions 

  • Most AMS products are fitted with sealed-for-life pre-lubricated bearings which do not require maintenance for the life of the fan.
  • Should your fan be fitted with grease nipples, the following instructions should be followed: - 

Recommended Lubrication intervals 

        Working Hours
        Motor Frame    48 rev/sec             25 rev/sec      16 rev/sec        12 rev/sec 
          160                    4000                     8000                 12000                 20000
          180-200             3000                     7000                 12000                 16000
          225-250             2000                     6000                 10000                 13000
          280                    1000                     5000                   8000                 13000
          315                    1000                     3500                   8000                 10000
  • Maximum interval 12 months.
  • These times are a guide only and will depend on the motor manufacturer and actual running conditions.

Recommended Greases 

  • Wherever possible the grease used should be identical to the original. When different greases are mixed, even if they are both suitable for the conditions, incompatibility can occur and result in rapid bearing failure.
  • Greases should be used as specified by the motor manufacturer.
  • SMOKE SPILL and high temp motors must use the grease stated on the motor to maintain the Smoke Spill approval.


  • If the grease lines are not extended to the outside of the case the fan must be electrically isolated for safety before work commences.
  • Clean the grease nipples with a clean cloth.
  • Introduce the new grease to all points while the fan is rotating until the old grease is purged from the grease relief port normally located at the bottom of the bearing housing.
  • If it is required to manually rotate the impeller, the fan must be electrically isolated to prevent accidental start-up. 


 Download pdf file


The Multiflow TDE 500 to 710 range consist of fully cased, cylindrical models with circular mounting flanges at both ends and a wired terminal box.


The Mini Centrifugal Roof Fan series are the new type roof extract units available in 2 sizes and suitable for vertical and horizontal installation. The low noise external motor and high efficient backward bladed impeller meets the requirement of efficient ventilation in residential, commercial and light industrial applications.

Future 150

The Decor Series can be wall or ceiling mounted and is designed to exhaust stale and moist air from bathrooms, toilets, laundries etc. They are also suitable for ventilating all types of small or closed areas.

TD Silent

The Silent Series is a low profile mixed-flow in-line fan that produces low noise when in operation. It does this through a specifically designed perforated internal skin that directs sound waves produced inside the fan to a layer of sound absorbent material.


The low-profile TD-EVO 250 and 315 in-line mixed-flow fans for circular ducts have a unique design where the support bracket allows the motor and impeller assembly to be fitted or removed without dismantling the adjacent ducting.


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