Smoke Extraction Motor Series

ATT Smoke Extraction Motors are specifically designed to meet demanding and critical industrial applications such as fire emergencies and more. Smoke extraction systems are employed in a wide range of environments including large buildings, shopping malls, factories, warehouses, enclosed parking lots, tunnels, among others.


This motor is made to provide a life-saving role through fastest possible extraction and clearance of toxic fumes and smoke at high temperature during emergencies. Incorporating these smoke extraction motors into your rescue or emergency systems may mitigate damage to property and financial loss by preventing the accumulation of smoke, reducing environment temperatures and the delay in rate of fire spreading.


ATT Smoke Extraction Motors are compliant to EN 12101-3 which determines the standard for “Smoke and Heat Control Systems”. All ATT Smoke Extraction Motors are tested and certified to operate for two hours at a temperature of 250°C, 300°C and 400°C.

Class Temperature (ºC) Duration
F250-120 250 ºC 2 hours
F300-120 300 ºC 2 hours
F400-120 400 ºC 2 hours


Item Standard Specifications
Type of Motor Totally Enclosed Air Over (TEAO) Squirrel Cage Cast Iron Induction Motor
Design Standard IEC 60034-1; EN 12101-3
Framesize 80-400
Voltage and Frequency Standard stock available are:

220-240/380-415V/50Hz for 2.2 KW & below

380-415/660-720V/50Hz for 3KW & above

Other voltages & frequency such as 200V, 346V, 440V & 60Hz can be supplied on request

Power Conditions ± 5% of rated voltage; ± 1% frequency and ± 1% phase unbalance
Efficiency Standard IE1 / IE2 / IE3 (IEC 60034-30-1)
Time Duty Continuous S1 or (S2 – (250°C or 300°C or 400°C/2hours – once only)
Cooling Method Fan application motors without a cooling fan, cooled by the airstream of the driven machine  (IC 418)
Method of Starting Full voltage direct on line starting or star-delta starting
Insulation & Temperate Rise Class Class H insulation and Class B temperature rise
Degree of Protection IP55
Rotor Winding Squirrel cage, aluminium conductor with end-ring and wafter blades integrally cast
Environmental Conditions Place: Non-hazardous, shaded

Ambient temperature: -20°C to 40°C

Relative humidity: Less than 90% relative humidity (non-condensation)

Altitude: Up to 1,000 metres above sea level

Direction of Rotation Standard motors are suitable for operation in either direction of rotation of shaft.

Direction of rotation can be reversed by interchanging any two of the power lines.

Test Procedure IEC and full voltage measuring starting operation
Fan Cover Pressed steel
Shaft Carbon Steel, round shaft with key
Bearing Grease pre-packed shielded ball bearing
Lubrication Heat resistant grease
Painting Phenolic rust-proof base plus lacquer surface finish. Painting in ATT red.
Ground Terminal NE set inside the terminal box
Terminal Box & Lead Wires Supplied with separate terminal box and 1 metre extended lead wires


Other Options Available (Contact ATT to inquire for other options)
VSD Driven Inverter duty motor suitable for VSD operation
Heaters Space heaters (110V/220V/1ph) or winding heaters available on request
Thermal Protection PTC thermistor 150°CWinding or bearing RTD (PT100)
Degree of Protection Up to IP66

The table below contains the various types of mounting available for Smoke Extraction Motor Series. If you are unable to find the dimensions to the mounting you prefer, please contact us for the outlining dimensions.