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ESP Purifiers

Ducted electrostatic precipitators from 4,000 to 64,000 m3/h - 95%+ efficiency, stainless pull-out ESP cell, modular stacking. CEP certified.

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ESP Purifiers
ESP Purifiers ESP Purifiers

Overview

The KL-D-J series is an electrostatic precipitator line for low-level kitchen exhaust. Working on plate-type ESP cell collection, it charges fume particles by high-voltage ionisation and then captures them in a low-voltage collection zone, separating grease particulate from the airstream at high efficiency. Thirteen models cover 4,000 to 64,000 m³/h, which spans everything from a night-market stall or snack shop up to a large restaurant chain or a food court.

The cabinets are modular and can be stacked – single, double or triple – to suit the space and the airflow available. The range carries CEP environmental product certification, reaches purification efficiency of 95% or better, and brings outlet fume concentration down to 1-2 mg/m³, so the discharge is visibly smoke-free.

Core configuration: a 12-pass stainless-steel ESP cell, a dual-drive IoT constant-voltage power supply, high-voltage ceramic insulators and a digital display.

Problems It Solves

Common Problem How the KL-D-J Series Handles It
Fumes discharged untreated, complaints from neighbours 95% or better efficiency with visibly smoke-free low-level discharge, cutting complaints from nearby residents and the risk of enforcement action
Failing environmental inspection CEP-certified product whose outlet concentration meets food-service emission limits, accepted as compliance equipment
ESP Cell is hard to clean, maintenance is constant Pull-out stainless-steel ESP cell that washes directly with water, every 2-3 months; a self-cleaning version is also available
No visibility of how the unit is running Circular digital display shows high voltage and current in real time, with automatic reminders for contamination level and cleaning interval
High-voltage arcing and safety concerns Eight power-supply protections, high-voltage ceramic insulators and door-open power cut-off remove the risk of leakage, arcing and electric shock
Limited installation space Modular cabinet that can be stacked and installed horizontally, suiting ceiling voids, service corridors and plant rooms
Fast ESP cell deterioration under heavy grease A pre-filter equalising screen intercepts large oil mist first, protecting the ESP cell and extending both ESP cell life and cleaning intervals

How It Works

Four-Stage Purification

Fume-laden air passes through four stages in sequence:

  1. Pre-filtration: a high-density grease screen intercepts large oil mist and debris, protecting the ESP cell inside.
  2. Charging: particles pass through a 12 kV high-voltage zone where fine oil droplets are ionised and charged.
  3. Collection: the charged droplets enter a low-voltage collection zone and are captured on the oppositely charged plates by the electrostatic force of the ESP cell.
  4. Final filtration and discharge: a high-density screen filters the air a second time, and clean air leaves through the outlet.

Grease collected on the plates runs down the stainless-steel surface and gathers at the bottom drain for disposal in one place.

stainless-steel ESP cell – the Core Component

Item Specification
Structure Plate-type pull-out ESP cell, two zones: ionisation and collection
Material Corrosion-resistant stainless steel, washable repeatedly without distortion or rust
Plate Forming 12-pass forming, four bends per plate, no burrs, rigid structure
Plate Spacing 7.5 mm, with variation held within 0.8 mm for a larger collecting area
Cleaning Pull the ESP cell out, soak in alkaline solution, then pressure rinse – every 2-3 months

Dual-Drive IoT Constant-Voltage Power Supply

The power supply is the heart of an electrostatic precipitator. This series uses a dual-drive IoT constant-voltage supply driving a two-zone ESP cell: constant-voltage control that tracks the load on the ESP cell and holds the optimum purification voltage, so efficiency does not fall away as grease builds up; eight protection layers covering adaptive stepped supply, high-voltage short circuit, soft start, transformer over-temperature, constant-voltage control, overload, arc suppression and open circuit; an IoT interface for connection to a remote monitoring system; and fault self-diagnosis that identifies the fault type and shows it on the display, cutting troubleshooting time.

High-Voltage Ceramic Insulators

The insulator is the barrier between the high-voltage electrode and the earthed housing, and it sets the safety and stability of the unit: high-voltage ceramic for dielectric strength and heat resistance; isolation of the electrode from the earthed case to prevent high-voltage leakage and arcing; an oil-shedding shape that keeps grease off the insulating surface so performance holds in wet, greasy conditions; and removable design so it can be inspected and replaced on its own.

Digital Display

A circular digital display on the front shows high-voltage output and current in real time, so running status is clear at a glance. It carries automatic reminders for contamination level and cleaning interval, helping maintenance happen on time and avoiding the efficiency drop caused by an over-dirty ESP cell.

Construction

  • Cabinet finish: electrostatic powder coating, corrosion and grease resistant for humid kitchen conditions.
  • Cabinet structure: horizontal modular cabinet, stackable in single, double or three-layer configurations.
  • Door panel: fitted from inside outward, flush and sealed against dust and water, with a reinforced hinge and lock.
  • Inlet and outlet: standard flanged connections for direct coupling to the existing exhaust duct.
  • Drainage: a drain port at the bottom lets collected grease out in one place instead of pooling inside.
  • Pre-filtration: an equalising pre-filter screen at the inlet intercepts large oil mist first.

Specifications

Parameter Value
Airflow Range 4,000 – 64,000 m³/h
Purification Efficiency ≥ 95%
Outlet Concentration 1 – 2 mg/m³
Ionisation Voltage 12 kV
Plate Spacing 7.5 mm (variation within 0.8 mm)
Total Power 300 – 2,400 W (model dependent)
Pressure Drop 107 – 176 Pa
Protection Rating IP65
Installation Horizontal, modular stacking (single / double / triple)
Certification CE certified; CEP environmental product certification

Model Range

Model Airflow (m³/h) Dimensions L×W×H (mm) Inlet / Outlet W×H (mm) Total Power (W) Pressure Drop (Pa)
KL-D-J40 4,000 470 × 850 × 690 610 × 490 300 107
KL-D-J60 6,000 770 × 670 × 690 420 × 490 300 113
KL-D-J80 8,000 770 × 856 × 690 610 × 490 300 133
KL-D-J100 10,000 770 × 1000 × 690 760 × 490 600 124
KL-D-J120 12,000 770 × 1170 × 690 925 × 490 600 131
KL-D-J160 16,000 770 × 1570 × 690 1325 × 490 600 125
KL-D-J200 20,000 770 × 1000 × 1270 760 × 1070 1200 129
KL-D-J240 24,000 770 × 1170 × 1270 925 × 1070 1200 125
KL-D-J320 32,000 770 × 1570 × 1270 1325 × 1070 1200 121
KL-D-J400 40,000 1540 × 1000 × 1270 760 × 1070 2400 153
KL-D-J480 (double stack) 48,000 1540 × 1170 × 1270 925 × 1070 2400 173
KL-D-J480 (triple stack) 48,000 770 × 1570 × 1870 1325 × 1670 1800 152
KL-D-J640 64,000 1540 × 1570 × 1270 1325 × 1070 2400 176

Quick selection: 4,000-8,000 m³/h suits stalls and small shops; 10,000-16,000 suits mid-size restaurants; 20,000 and above suits large restaurants, food courts and centralised exhaust systems. Figures are taken from the official product specification sheet; the shipped configuration of each unit is final.

Selection Guide

By Cooking Method

Cooking Method Fume Load Recommended Airflow Selection Note
Steaming, boiling, stewing, holding Light 4,000 – 6,000 A small electrostatic unit is enough; consider a condensing type where steam is heavy
Pan-frying, everyday stir-fry Medium 6,000 – 12,000 Select by burner count, roughly 2,000-3,000 m³/h per burner
Wok bursts, Sichuan and Hunan style Heavy 12,000 – 20,000 Allow extra airflow margin and add pre-filtration to protect the ESP cell
Deep frying, fryers Heavy plus high temperature 16,000 and above Size airflow at 1.5x; a water-spray pre-treatment ahead of the electrostatic stage is recommended
Grilling, charcoal Very heavy plus odour 20,000 and above Electrostatic handles the smoke; odour needs a separate treatment stage

Estimating Airflow from Burner Count

  • Each Chinese wok burner: approximately 2,000-3,000 m³/h
  • Each metre of hood length: approximately 2,000-2,500 m³/h
  • Grilling and frying: base airflow x 1.5-2
  • Allow a 20% margin so adding a burner or changing the menu later does not mean replacing the unit

By Site Conditions

Site Condition Recommended Configuration Note
Existing ductwork and fan in place Purifier only, stand-alone Connects straight to the existing fan and duct; lowest cost
No fan, want a simple install Unit with integrated fan (small airflow range) 4,000 / 6,000 / 8,000 available, runs on 220 V mains
Restricted space Stacked configuration Double or triple stacking saves floor area
Heavy grease, want fewer cleanings Pre-filtration plus larger airflow Extends cleaning intervals and protects ESP cell life

Application Scenarios

  • Small Food Service: stir-fry shops, noodle houses, fast-food outlets, malatang and rice-noodle shops, food court stalls and coffee shops with light-meal service.
  • Heavy-Grease Restaurants: Chinese restaurants, Sichuan and Hunan kitchens, grill and charcoal BBQ shops, frying and fried-chicken shops, canteens and staff restaurants.
  • Commercial Complexes: centralised exhaust for mall restaurant floors, food courts, shopping-centre dining zones and retail-street food units.
  • Stalls and Mobile Setups: night-market stalls and snack carts, pancake and skewer stands, teppanyaki and mobile units, small street-front counters.

Reference Cases

  • Low-level discharge retrofit at a community stir-fry shop: a street-front shop with three wok burners, discharging untreated fumes and drawing repeated complaints from residents above, under an order to rectify. A KL-D-J120 (12,000 m³/h) was coupled to the existing centrifugal fan and installed in the kitchen plant space. Result: no visible smoke, outlet concentration within limits, complaints stopped, and the compliance re-inspection passed.
  • Centralised exhaust for a food court: fifteen stalls discharging into one system, with total volume high and the original ducted exhaust out of compliance. A KL-D-J400 plus KL-D-J240 combination (64,000 m³/h total) was installed as a double stack on the roof plant deck. Result: one central treatment point discharging to low-level requirements, so individual stalls did not need their own units.
  • Mobile purification at a night-market stall: a pancake and skewer stall with no fixed duct, concerned about complaints and being moved on. A KL-D-J40 with integrated fan (4,000 m³/h) was paired with a hood and ducting, running on 220 V mains or battery. Result: purification from the moment trading starts, no smoke on site, accepted by the market operator.
  • Standardised maintenance across a restaurant chain: twenty branches of a Sichuan brand, heavy kitchen fumes, high manual ESP cell cleaning cost and no consistent maintenance standard between stores. The KL-D-J series was matched to burner count per store (8,000-16,000 m³/h each) and connected to IoT remote monitoring. Result: head office can check running status and cleaning reminders for every unit remotely, with one maintenance standard and lower inspection cost.

Installation and Maintenance

Installation Notes

  • Leave at least 1 m of service space in front of and behind the unit so the ESP cell can be pulled out for cleaning.
  • Install upstream of the fan, on the negative-pressure side, to keep grease off the fan.
  • For outdoor installation, protect against rain and make the power connections waterproof.
  • Keep bends and diameter changes in the ductwork to a minimum to hold down resistance.
  • Earth the cabinet reliably.

Maintenance Intervals

Task Interval What to Do
ESP cell cleaning Every 2-3 months (monthly for heavy grease) Isolate power, pull out the ESP cell, soak in alkaline solution for 15 minutes, pressure rinse, dry and refit
Bottom drain Monthly Open the bottom drain port and release accumulated grease
Pre-filter screen Monthly Remove the equalising pre-filter and rinse off the heavy oil mist
Insulator inspection Quarterly Check for grease build-up and cracks; clean or replace
Power indicator Daily visual check Confirm the run light is normal; if a fault light is on, follow the prompt

If Performance Drops, Check in This Order

  1. Is the ESP cell overdue for cleaning and heavily greased – the most common cause.
  2. Is the door closed properly – the door-open cut-out stops the unit working.
  3. Is the power indicator normal, with no fault alarm showing.
  4. Does the fan airflow match, and is there any duct leakage.
  5. Is inlet fume concentration above the design figure (20 mg/m³) – heavy grease needs pre-treatment.
Certifications & Compliance

Built to Global Standards

Every SOUNINY unit is engineered, tested and supported by a verified commercial-kitchen air-purification manufacturer.

CE

CE Certified

Conforms to EU health, safety and environmental requirements for commercial equipment placed on the European market.

STD

Code Compliant

Designed to commercial-kitchen ventilation standards such as EN 16282 and referenced UL 710 / ASHRAE 154 practices for grease and smoke control.

MFG

Factory-Direct

Made by a National High-Tech Enterprise founded in 2015. Minimum order quantity of 1 unit, with full OEM / ODM customization.

SUP

Warranty & Support

12-month warranty, global shipping and English technical support from our application engineering team.

Manufactured by Shenzhen Shuangni Environmental Technology Co., Ltd. — learn more about our facilities and global projects on the About page.

FAQ

Frequently Asked Questions

How do I work out what airflow I need?
Estimate from burner count: each Chinese wok burner needs roughly 2,000-3,000 m3/h. One burner points to 4,000 m3/h, two burners to 6,000-8,000, and three or four burners to 10,000-12,000. For grilling, frying and heavy wok work, add 20-50% on top. You can also work from hood length: roughly 2,000-2,500 m3/h per metre of hood.
Is bigger airflow always better?
No. Airflow has to match the burner count, hood size and duct resistance. Too little and fumes are not captured and escape the hood; too much and the air spends less time inside the ESP cell, which reduces purification, while also adding power cost and noise. A margin of about 20% is enough - there is no need to oversize.
Is there a version with a built-in fan?
Yes, in the small airflow range - 4,000, 6,000 and 8,000 m3/h come as an integrated unit with fan, running on 220 V mains, which suits stalls and small shops. Above 10,000 m3/h the fan is normally supplied separately by the site contractor, since large fans draw more power and their mounting position is site-specific.
I already have a fan - can I buy the purifier on its own?
Yes, choose the stand-alone purifier, but confirm that the existing fan matches. Fan airflow should be about 1.1 to 1.2 times the rated airflow of the purifier, and the available pressure must overcome both the duct resistance and the purifier pressure drop, which is roughly 100-180 Pa.
Should the purifier go before or after the fan?
Upstream of the fan, on the negative-pressure side, so fumes pass through the purifier before reaching the fan. The fan then handles cleaned air and stays free of grease, which extends its life. Mounted downstream, the impeller collects grease, causing vibration, noise and a short service life.
What are the ductwork requirements?
Keep duct velocity around 8-12 m/s: too slow and grease settles, too fast and it is noisy. Minimise 90-degree bends, since each one adds roughly 15% resistance. Use gradual transitions rather than sudden reductions or expansions. Leave at least 1 m of straight duct and service space before and after the unit, and seal all joints, because leaks reduce capture at the hood.
Can it be installed outdoors?
Yes. The KL-D-J series is rated IP65 for outdoor use. Fit a rain cap, make the terminal box waterproof and earth the cabinet reliably. In cold climates, protect the ductwork against freezing.
Can I install it myself or do I need a contractor?
The small integrated units with fan can usually be connected to ducting and power by the customer. Larger airflows or complex duct runs should be handled by a professional contractor, since fan matching, duct pressure calculation and electrical work all affect how well the unit performs.
Why is there still smoke after installation?
Check in this order: whether the ESP cell is overdue for cleaning and heavily greased, the most common cause; whether the door is fully closed, since the door-open cut-out stops the ESP cell working; whether the power indicator is normal with no fault alarm; whether fan airflow is sufficient and the ductwork sealed; and whether the unit is simply undersized for peak-time fume volume.
Does an electrostatic purifier remove cooking odour?
It removes fume particulate - the visible white smoke - and noticeably reduces cooking smell, but it has limited effect on the volatile odour molecules from grilling and frying. Where odour complaints are serious, add an activated-carbon adsorber or a UV photolysis stage downstream of the electrostatic unit.
How do I confirm the result meets the standard?
Two ways. Visually, there should be no obvious white smoke at the outlet. For confirmation, commission a qualified testing agency to sample at the outlet after installation - a concentration of 2.0 mg/m3 or less meets the national standard. The KL-D-J series reaches 95% efficiency or better and meets low-level discharge requirements.
Does efficiency fall over time?
Yes, which is normal. The thicker the grease layer on the plates, the weaker the collection. Cleaning the ESP cell regularly, every 2-3 months, restores it to as-new performance. Left uncleaned, the grease layer insulates the plates and the ESP cell effectively stops working.
How often should the ESP cell be cleaned, and how do I know when?
Every 2-3 months for normal food service, and monthly for grilling, frying and Sichuan or Hunan style cooking. Signals to watch for: the current reading on the digital display drops noticeably, below about 80% of rated; smoke becomes visible at the outlet; or the unit starts arcing frequently. The display also prompts the cleaning interval automatically.
Is cleaning the ESP cell difficult?
No, it can be done in house: isolate the power and wait three minutes for the high-voltage capacitors to discharge; open the door and pull out the ESP cell; soak in alkaline solution or a dedicated cleaner for 10-15 minutes; rinse with a pressure washer; dry it and refit, then close the door and restore power. The ESP cell must be completely dry before it goes back under power, or it will arc. Do not scrape the plates with steel wool, which damages the surface.
Do the insulators need maintenance?
Inspect them quarterly. Grease on the insulator surface reduces insulation and causes high-voltage arcing. Wipe with a dry cloth rather than rinsing with water, and keep them dry. Replace any insulator that is cracked or damaged.
How is the grease collected at the bottom handled?
There is a drain port at the bottom of the unit; open it periodically to release accumulated grease. Monthly is typical, more often under heavy grease. A cup or small container can be placed under the port to collect it.
The unit has power but the indicator is off and nothing runs - what should I check?
Check that supply power is present and the breaker has not tripped; check the supply wiring for loose connections; check that the door is fully closed, since the door-open cut-out removes power; and check whether a fuse has blown. If all of these are fine and it still does not light, contact after-sales to have the power module checked.
Is a buzzing or cracking sound during operation normal?
A faint, even electrical hum is normal. Frequent sharp cracking or a high-pitched noise means a fault, usually from grease build-up thick enough to conduct across the plates, a damp ESP cell refitted before it was dry, dirty or cracked insulators, or debris inside the ESP cell such as insects or metal swarf. Isolate the power, pull the ESP cell out for inspection and cleaning, dry it, and check that the insulators are clean.
The display shows a fault code - what does it mean?
The intelligent power supply has fault self-diagnosis and the display indicates the fault type. Common ones are short-circuit protection, meaning debris or heavy grease in the ESP cell; over-temperature protection, meaning high ambient temperature or poor ventilation; and open-circuit protection, meaning the ESP cell is not seated correctly or has a poor contact. Work through the matching component, and contact after-sales if it cannot be resolved.
How long does the ESP cell last, and when should it be replaced?
With normal use and regular cleaning, a stainless-steel ESP cell lasts roughly three to five years. Consider replacement when the plates are visibly distorted with uneven spacing, when efficiency is clearly down even after cleaning, when the plates are badly corroded, or when arcing continues after cleaning and insulator maintenance.
What is the service life of the whole unit?
The housing and structure last ten years or more. Wear parts - ESP cell, power supply and insulators - may need replacing after three to five years under normal maintenance. A full annual check is recommended, covering electrical connections, insulators and power output.
If it fails, should I repair or replace?
Minor issues - cleaning, a fuse, an insulator or the ESP cell - are worth repairing, since the cost is low. If the unit is over five years old with an aged power supply, a distorted ESP cell and repair costs past half the price of a new unit, replacement usually makes more sense, as newer equipment is better on both energy use and purification efficiency.

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