Central Railways CSM Terminal, India.

Central Railways CSM Terminal, India.

A Case Study : Epoch HVLS 20-ft Fan By Falco eMotors Inc.
Report No. 041620-02

Saving on Electricity

2 X

Get 2 x Airflow

<35 dBA

Lowest sound in the World

Key Facts


  • Direct Drive PMSM Motor;
  • Lowest Weight;
  • Active Power Factor Corrected;


  • Industrial


  • India.


  1. CST, Mumbai is one of the busiest railway platforms in India. Many people visited and traveled through CST, Mumbai.

  2. In such a crowded place, physical comfort is a crucial factor. Also, the temperature in Mumbai is very high in summer.

  3. To make the visitors comfortable, high air movements are required to get physical comfort.

  4. Also, it is not affordable to install an HVAC system in such a large railway station. The energy used by the HVAC system is also very high.

  5. To get better results and use less energy, CSMT officials proposed a plan to install HVLS fans in railway stations


  • Epoch 2.0, 20-ft (3 Blades) Fan was installed with the following specifications ;
    • Motor: Epoch 2.0;
    • Coverage Area: 15,400 Sq. Ft. (1,430 Sq. m);
    • Speed: 81 RPM;
    • Peak Power: 1.1kW/1.5 hp;
  • Epoch 2.0 20 ft diameter fan becomes most popular with amazing airflow and airflow efficiency.

Site Survey

A site survey is mandatory before any HVLS fan recommendation. The survey revealed the following dimensions:

  • Total Area: 705 ft X 250 ft = 176,250 Sq. ft.
  • Floor to Ceiling Distance: 22 to 26 ft
  • By a rule of thumb distance/1.5 gives us the approximate fan diameter.
  • In this case, we chose to go with a 20-ft fan.

Site Measurements

Fans and coverage area

Test Reports

Three test reports are collected for each fan installation as follows:

Power Consumption Report

Power consumption report captures the real as well as apparent power. Epoch HVLS fans are the only fans in the world to have active power factor correction and unity power factor. Therefore the Watts (Real Power) and VARs (the apparent power) are almost the same. The power has been captured at 40, 50, 60, 70, and 80 RPM. Power drawn at those speeds are 142, 225, 330, 515, 714 W respectively. The chart above also shows trend lines generated using Excel for real and apparent power to take into account any measurement errors as fan power consumption can be modeled by well known equations.

Input Current Report

The input current is also measured at 40, 50, 60, 70, and 80 RPM. Input current is recorded as 0.61, 0.945, 1.375, 2.13, and 2.96 A respectively. The input voltage varied from 230 to 240V during the measurement.

Air Flow Report.

The airflow is measured from the center of the fan and is recorded at every 3-ft distance. Values were recorded upto 27-ft from the center of the fan. The values were respectively, 334, 452, 433, 511, 492, 450, 450, 393, 393 and 334 ft/min at distances of 3,6,9,12,15,18,21,24, 27 and 30-ft respectively.

Finished Installation

This is the photo of the finished installation.