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)
MAJOR COMPONENTS
OF KITCHEN HOOD EXHAUST AIR CLEANING SYSTEM:
Generically, an air cleaning system for a
kitchen hood exhaust consists of three major components:
- Particulate filtration for smoke and
mist.
- Gas filtration for gases/odors.
- 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.
KITCHEN HOOD
EXHAUST AIR FILTRATION SYSTEMS TO MEET YOUR BUDGET
Our air cleaning equipment for commercial
kitchen hood exhaust filtration is available in a number of configurations
depending on your budget and space limitations:
- $ 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.
- $$ MODERATE
The next step up is to order the equipment consisting
of ESP, carbon module, and possibly blower, preassembled on steel
rails with transition ducting, if required, between the ESP and Carbon
module. If a blower is also supplied by us, it will additionally be
mounted on the steel rails with a transition duct between the carbon
module exhaust and blower inlet.
- $$$
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.
EQUIPMENT AND SPECIFICATIONS
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.
 Brochure:
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
- 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.
CHOOSING KITCHEN HOOD EXHAUST AIRFLOW
FYI:
Fundamentals of Kitchen Hood Exhaust
Design
EXAMPLE COMMERCIAL
KITCHEN HOOD EXHAUST SCRUBBER SYSTEM
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:
- 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.
- 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.
- Odor module
containing coconut shell carbon to remove gases and odors.
- An existing blower to
pull the air through the hood, ducting, ESP's, Odor Module, and transition
ducts.
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