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Kitchen Hood Exhaust

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Friedrich electronic air cleaners - Authorized Dealer - Berriman.com


Commercial Kitchen Hood Exhaust
Air Cleaners, Filters, Purifiers, Scrubbers

Remove Cooking Smoke, Mist, Odors

Approved for use & meets stringent standards for New York City

Meets applicable UL & NFPA requirements

(Approved with New York City MEA number)


Generically, an air cleaning system for a kitchen hood exhaust consists of three major components:

  1. Particulate filtration for smoke and mist.
  2. Gas filtration for gases/odors.
  3. Blower to move the air into the hood, through the air cleaning equipment, to the outdoors, usually.

Particle Filtration for smoke and mist
This section of the air cleaning system generally consists of an electronic air cleaner sometimes referred to as an electrostatic precipitator (ESP).  The technology used has been available for decades and it is currently in use not only for kitchen hoods, but also welding smoke and mist collection from machine tools in factories.

As air enters the ESP, the air passes through a high voltage section which deliberately places an electronic charge on any smoke or mist particles in the air stream.  Then the charged particles pass through an electric field (think of it like a magnetic field) which is designed in such a way as to place a force on the particles perpendicular to the direction of air flow, thus moving the particles out of the air stream to be collected in a component of the ESP named the collection cell(s).

Filtration efficiency of the ESP is inversely proportional to the airflow.  As the airflow increases, the efficiency decreases.  As the airflow decreases, the efficiency increases.  For kitchen hood exhaust applications, efficiency should be as high as possible with a minimum efficiency of 95%.

During ESP operation, the precision aligned collection plates within the collection cell(s) become soiled with cooking smoke and oil mist from the kitchen hood exhaust.  Unless the collection plates are kept clean, the collection efficiency of the ESP is reduced.  Therefore, the collection cell(s) must be periodically cleaned for optimum performance of the ESP.

We offer both manually cleaned and self-cleaning versions of the ESP.  Manually cleaning the collection cells involve opening an access door to the ESP, removing the cell(s), placing the cell(s) in a container filled with electronic cell cleaner detergent, letting the cell(s) soak for several minutes, rinsing the cell(s), letting the cell(s) dry, and finally, reinserting the cell(s) into the ESP.  The self-cleaning version of the ESP automates this process and may be placed on an optional 7 day programmable timer which will determine automatically when the wash cycle will occur.  

Gas/Odor Filtration
A form of carbon media is generally used to capture gases and odors.  A bulk refillable module containing ample media to capture gases, will follow the ESP. 

  • Ample Media: There must be enough gas adsorbing media in relation to the air flow through the air cleaning system such that the contaminated air spends enough time in the media that the gases/odors may be properly adsorbed with sufficiently high single pass efficiency before the filtered air is exhausted.  The industry standard is that the air be in contact with the gas adsorbing media for a minimum "residence time" of 0.10 seconds assuming evenly distributed, laminar, airflow through the module containing the gas adsorbing media, which is never the case. Airflow is faster in the center of the module than at the edges, and this will result in lower residence time.  Therefore, the gas/odor modules are specified/designed for maximum airflows that ensure proper residence time for all the air moving through the module, including the faster moving air near the center of the module.
  • Bulk Refillable: Eventually the media becomes saturated from the adsorpsion of gases/odors and is unable to adsorb anymore.  At that time or before, the media must be replaced. The module is designed to be refilled in the field by the user.  It is not necessary to repurchase components filled with media, only the media itself is needed. 

Air Handler - Blower/Motor
A blower is necessary to pull the contaminated air cooking up into the kitchen hood intake, through the hood exhaust and ducting, into the ESP, carbon module, any transition ducting, the blower itself, and any additional ducting on the exhaust side of the blower.

We can provide air filtration systems with or without a blower.  The actual blower and motor selection is dependent on the air resistance of the entire network, including the hood, transitions, air cleaning equipment, etc.  The air resistance is termed static pressure drop.  An estimate of the static pressure drop is needed in order to properly size and select the blower/motor for the job site.  Since we know the static pressure of our air cleaning equipment, if we are supplying the blower, we will need an estimate of the static pressure drop external to the air cleaning equipment.  If you are working with an engineer, that information should be available.


Our air cleaning equipment for commercial kitchen hood exhaust filtration is available in a number of configurations depending on your budget and space limitations:

  1. $ BASIC
    The most basic system is to purchase the ESP, carbon module, and blower components, separately, and then have a local mechanical contractor provide transition ducting, wiring, and installation at the site. This is a good approach when the facility has limited space.
  2. $$ MODERATE
    The next step up is to order the equipment consisting of ESP, carbon module, and possibly blower, preassembled on steel rails with transition ducting, if required, between the ESP and Carbon module.  If a blower is also supplied by us, it will additionally be mounted on the steel rails with a transition duct between the carbon module exhaust and blower inlet.
  3. $$$ ADVANCED
    In self washing ESP systems, when mounted on steel rails, we can also completely wire the system at the factory so an electrician at the installation site only needs to bring appropriate electrical power to a NEMA junction box on the air cleaning equipment.   All the required detail wiring has already been completed.

Commercial Kitchen Hood Exhaust air cleaning, purifying, scrubbing, filtering systems are available for interior installation or exterior/rooftop installation with factory fabricated and assembled weather enclosures.

Note: Some of these systems mounted on steel rails with a blower can be quite long and wide.  In some cases, construction of the restaurant may necessarily need to be paused until the commercial kitchen hood exhaust air filtration system can be moved into position in the kitchen, if installed in the interior of the facility.


We have air cleaning equipment rated for 2,000, 4,000, and 8,000 or more cubic feet per minute (CFM) air flows with operating efficiency of 95% and up.  In other words, at these air flows, each of the systems will operate at 95% efficiency, however, as the air flow is reduced in each system, the efficiency increases.  This is a characteristic of ESP's.  In some applications, more than one ESP and/or odor module may be necessary to process higher airflows with 95% or higher efficiency.

Information Request: air purifiers, air cleaners, dust collectors, mist collectors, odor removersBrochure: Commercial Kitchen Hood Exhaust Air Cleaners Filters Scrubbers Purifiers

Electrostatic Precipitator (ESP) Specifications & Literature

The following ESP's are manufactured with black painted cold rolled steel with welded seams.

NOTE: The following ESP's are for use with cooking equipment fueled by gas or electric.  But, not for use in applications where the cooking equipment uses solid fuel such as coal, charcoal, or wood. 

  • Model F72 Manual Cleaning ESP
    • Webpage
    • Brochure
    • Manual

      • F72 drawings: PDF page 4

      • Weights: PDF page 3

      • Power: PDF page 3

      • Efficiency vs. Airflow: PDF page 3 (95% minimum required for kitchen hood exhaust)

      • Static Pressure Drop: PDF page 3

      • Maintenance: PDF page 11

      • Warranty: PDF page 18

  • Autoclean/F61 Automatic Self-Cleaning ESP
    • Webpage
    • Brochure
    • Manual
      • Autoclean drawings: PDF pages 4-5
      • Weights: PDF page 5
      • Power: PDF page 6
      • Efficiency vs. Airflow: PDF page 7 (95% minimum required for kitchen hood exhaust)
      • Static Pressure Drop: PDF page 7
      • Hot Water Usage: PDF page 12
      • Wash Cycle Sequence: PDF page 17
      • Maintenance: PDF page 18
      • Warranty: PDF page 27

Odor Modules Specifications & Literature  

The following modules are manufactured with either black painted cold rolled steel, or, aluminized steel, both with welded seams.

  • 1,000 CFM max Carbon Module
  • 2,000 CFM max Carbon Module
    This module has been upgraded/revised to 8 two inch deep trays holding a total of 144 lbs coconut shell carbon.  The module is shown with a 65% filter on one end.

  • 4,000 CFM max Carbon Module
    This module has been upgraded/revised to 16 two inch deep trays holding a total of 288 lbs coconut shell carbon.  The module is shown with a 65% filter on one end.

  • 5,500 CFM max 1.5 x 2 Custom Carbon Module
    This custom module has been upgraded/revised to 24 two inch deep trays holding a total of 432 lbs coconut shell carbon.  This custom module does not have the same face size as the ESP air cleaners above, so transition ducting is necessary.  The module is shown with a 65% filter on one end.
  • 8,000 CFM max Carbon Module
    This module has been upgraded/revised to 32 two inch deep trays holding a total of 576 lbs coconut shell carbon.  The module is shown with a 65% filter on one end.


FYI: Fundamentals of Kitchen Hood Exhaust Design


The following drawing shows an example commercial kitchen hood exhaust air filtration system, in blue, connected to an 18 foot long hood, red, designed to operate at 300 CFM airflow per linear foot for a total of 5,400 CFM.  Interconnecting ductwork and transition ducts are shown in gray.

The major components of the system consist of the following:

  1. Autoclean 4000 self washing ESP connected directly to the hood via ducting and operating at 3600 CFM, below it's rated maximum of 4,000 CFM, to achieve efficiencies in excess of 95% on smoke and mist.
  2. Autoclean 2000 self washing ESP connected directly to the hood via ducting and operating at 1800 CFM, below it's rated maximum of 2,000 CFM, to achieve efficiencies in excess of 95% on smoke and mist.
  3. Odor module containing coconut shell carbon to remove gases and odors.
  4. An existing blower to pull the air through the hood, ducting, ESP's, Odor Module, and transition ducts.

Commercial Kitchen Hood Exhaust Filtration System Example Drawing

EXAMPLE PHOTOS (click photo to enlarge)

Integrated Autoclean 4000 with carbon & blower on rails for indoor installation
(95% ASHRAE @ 4,000 CFM)
Integrated Autoclean 8000/4000 double pass with carbon & blower on rails for outdoor installation
(99% ASHRAE @ 12,000 CFM)
Integrated stacked F72B double pass system with carbon on rails for indoor installation
(99% ASHRAE @ 8,000 CFM)
Integrated F72B with carbon on rails
for indoor installation
(95% ASHRAE @ 4,000 CFM)

 Our Air Cleaners are Rugged, Reliable, Proven.

Industrial Air Cleaners, Purifiers, Dust & Mist Collectors

Our full line of interchangeable air cleaning modules, blowers, and accessories allows us to economically tailor equipment to match your specific requirements. In addition, modular construction allows easy adaptation of existing air cleaning units to changing circumstances.

Let us use our many years of air cleaning experience to help solve your indoor air quality problems and improve your productivity and profitability.

We use proven technologies and a comprehensive range of equipment to handle harmful airborne industrial contaminants, such as, welding smoke, coolant mist, grinding dust, laser and plasma cutting smoke, carbon dust, and gaseous contaminants.  Our industrial air cleaning equipment is easily  user-installed and is available for general background air cleaning or for source capture applications (portable, ducted, and machine tool-mounted).

Solidly built for heavy industrial use, our air cleaning equipment is tough, reliable, and easy to maintain. 

With this experience, we are properly positioned to provide a solution to address your commercial kitchen hood exhaust filtration requirements.  Contact us today.

What we need from you:
When you inquire about our commercial kitchen hood exhaust air scrubbers, cleaners, purifiers, filters systems for cooking smoke, mist, and odors, please have the following information available:

  1. Required Kitchen Hood Exhaust Airflow, hopefully blessed by an engineer.
  2. Do you want us to supply the blower?
    If you want us to provide the blower, please have the static pressure drop of the hood and associated ducting, excluding the air cleaning equipment.  This is available from your engineer.
  3. Please tell us if you want an interior installation or exterior/rooftop installation.
  4. Do you want manually or automatically cleaning electronic air filtration equipment?
  5. Available electrical power: voltages & phases
  6. Space limitations
  7. Do you want the Basic, Moderate, or Advanced system outlined on this page above?
  8. Is solid fuel used in the cooking equipment, such as coal, charcoal, or wood for a pizza brick oven??

Common Questions regarding Fire Suppression:

  • Q: Do you offer a system with a pre-piped fire protection system (ANSUL) and do you offer a cabinet (remote) for storage of the ANSUL tanks? If you do not offer a pre-piped fire protection system, is there an acceptable way for our fire protection division to install our own ANSUL system with heads inside of the cabinet?

    • A: We do not pre-pipe for ANSUL. In general, the heads are installed in the ductwork and/or transitions of the Kitchen Hood Exhaust Air Filtration System commonly referred to as Pollution Control Unit (PCU), not directly in the Electrostatic Precipitator (ESP) Autoclean/F61/F72 cabinet.  This allows the installer more freedom in locating the heads.

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Many, but not all models are displayed.  Air Purifiers are available with a variety of electrical options to meet the power standards of most countries.

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