Electrostatic Precipitator (ESP) Manufacturers in India

Span Filtration Systems (SFS) has been providing solutions in industrial air filtration for over two decades. With installation of 1000+ solutions across multiple industries SFS is a market leader in industrial air filtration in India. Today, it is one of the leading electrostatic precipitator manufacturers in India. Over time, we have emerged as specialized & market leaders in wet electrostatic precipitator manufacturers.

Effective filtration of wet and dry smoke generated from manufacturing processes is vital not just to worker’s health and safety, but even for smooth and efficient operation of the equipment. Being a one of India’s veteran ESP manufacturers, SFS has years of experience and expertise in engineering to help you achieve desired results. We offer a wide range of electrostatic precipitators that can serve your specific needs and meet the operational budgets. Our technical expertise ensures that you always have solutions that provides perfect performance and fit all your needs. Going beyond our role as ESP manufacturer and supplier, we offer reliable post-sales service and advise to obtain performance that exceeds customer expectations.


Heat-treatment | Cold-drawing | Gear cutting | Grinding with straight oil | Straight oil machining | Forging operations and cold pressing | Oil mist and dry smoke of other metal working/heat-treatment processes

vertical-horizontal-ESP -span filtration
Electrostatic-precipitator-(ESP)-product-image-span filter
SF 14 H 400/600 580 880 1160
SF 25 H 800/1350 580 880 1330
SF 34 H 1200/2000 580 880 1790
SF 45 H 1600/2700 1000 1200 1690

Electrostatic precipitator (ESP) working principle

Electrostatic precipitator working principle involves ionization of air by applying high voltage to collect the fine soot or dust and oil particles in the smoke and thus filter the air. In an ESP, polluted air passes through two electrodes. These electrodes can be built in the form of bars or plates which are placed inside a pipe. The shape of the electrodes varies according to the type of ESP used. One of these electrodes is charged with negative voltage which passes on the negative charge to particulates in the smoke passing through the unit. The other electrode situated further along the pipe is charged with positive voltage. The negatively charged particles are attracted to this electrode and stick to it. The plates used in ESPs can be easily washed and cleaned for reuse.

ESP design

When designing the equipment, ESP manufacturers will typically consider a number of process variables. These include:

  • The size and distribution of particles
  • Gas flow rate
  • Resistivity of the particles
  • Gas temperature
  • Chemistry of the particle

Despite the simplicity of esp working principle in theory, ESP manufacturers as well as users are aware that ,any factors influence the practical working of an electrostatic precipitator. These include the temperature of the ESP, the velocity of gas steam passing through the precipitator, concentration of particles at a point, etc. The amount of moisture in the gas plays a role in determining the effectiveness of the ESP. Close consultation with the ESP manufacturers is necessary even in the initial days of operation of the unit.

ESP working principle for wet electrostatic precipitator

SFS is a market leader among wet electrostatic precipitator manufacturers in India. ESP working principle for wet electrostatic precipitators is similar to dry ESP. In a wet ESP, the gasses are conditioned to take them near saturation point so that they become more conductive for charging b through water-spraying. The material then passes through electrodes bearing negative charge. When the charged particulates arrive at collection point, they are cleared off with a flushing water rather than a mechanical rapping process. In a wet ESP working principle, the collection point is continuously kept in a wet condition to prevent agglomeration of material. Due to the wet environment in such equipment, ESP manufacturers use corrosion-resistant materials like stainless steel or special alloys to fabricate these ESPs.

Due to its wet interface, a wet electrostatic precipitator is better able to trap particulates that are sticky. Its different ESP working principle also allows it to efficiently collect particulates present in gas steam which is near the point of saturation. Wet ESPs are also capable of catching sub-micron particles with acid mist. ESP working principle of wet ESPs ensures low outlet emissions, lower risk of fire, and are more sustainable. They effectively trap sticky dust and reduce greenhouse gas pollution more efficiently.

SF 25 V 800/1350 950 1780 580
SF 34 V 1200/2000 950 2125 580

Wet electrostatic precipitator (ESP) manufacturers

Being a major electrostatic precipitator supplier in India, SFS has two decades of experience and expertise in providing a wide range of electrostatic precipitators that can serve your specific needs while meeting operational budgets. Our technical expertise ensures that you always have solutions that provide perfect performance and fit all your needs.


Compact high performance systems for smoke collection

SFS’s range of ESPs are proven across a wide range of applications to filter dry and wet smoke.


Complete solution to meet occupational, health and safety requirements

ESPs are highly effective in filtering smoke. The working principle involves ionization of air by applying high voltage to collect the fine soot or dust and oil particles in the smoke and thus filter the air. The plates used in ESPs can be easily washed and cleaned for reuse.

Why ESPs?

  • Oil smoke is hazardous and long term exposure can pose serious risks to life
  • The dust and oil settles on the floor and machine surfaces and causes slippery surfaces affecting safety and performance
  • Potential fire risks are created if oil smoke layers are formed in ventilation pipes, sensitive equipment like control panels etc.
  • Cutting oil collected during oil smoke extraction can be made available for reuse
  • Oil smoke levels beyond a certain level in the work environment violate pollution norms
electrostatic-precipitator - span filtration


Efficient design of air flow with options for easy cleaning ensures effective filtration and economical energy consumption.


With a smaller and more compact design, the ESPs can be easily mounted on any machine or equipment.


Lower blower maintenance required as blowers are mounted on cleaner side.


Built-in safety features and unique power pack, coupled with safety switch to disconnect ESP in case switched on when the door is still open.


Vertical ESPs have relatively smaller footprint & are therefore ideal in case of space constraint.


Additional safety with indicating lamps on control panel to showcase operating conditions.


Neat oil machining gets cleaner
India's largest manufacturer of cars recently selected Electrostatic Precipitators from SFS as a filtration solution for one of its most polluting manufacturing processes - gear cutting. As the pre-installed mist filters choked frequently, all the heavy soot, smoke and mist generated in the process accumulated in the machining chamber posing risk to the health of workers.
For trials, SFS suggested Maruti Suzuki to choose the process with toughest and highest air contamination on the shop-floor to test the performance of ESPs. The gear cutting process was selected to test the filtration performance of horizontal ESPs from SFS. After an extensive trial, conducted over a period of one and half months, the engineers recommended the ESPs for delivering superb filtration performance, throughout.
Gear cutting at Mahindra goes pollution free...
When Mahindra was commissioning a new production line it wanted a filtration solution for the gear cutting processes that involved neat oil machining. SFS had already provided its industry-leading ESP filters for similar applications. Mahindra's team trusted SFS's proven technology for its application.
ESP's by SFS not just helped to keep the air clean but came with minimal maintenance and consumable costs, generating significant savings. When Mahindra changed its machining programs and increased the speeds for its gear cutting line, SFS's ESPs could be quickly configured to handle and filter the additional volume of smoke generated in the process. The result was an easy, effective, low maintenance filtration solution that could easily adapt to changing needs of the process application.


    Corporate Brochure-Span Filtration