SmogHog SGN · High Volume Unicell Electrostatic
SmogHog SGN Electrostatic Mist Collector
When the answer stops being one collector per machine and starts being one collector for the row. The SGN combines the ionizer and the collection cell into a single unicell, which is what lets the airflow climb to 9,000 CFM without the cabinet count climbing with it.
Your SGN unit, unicells, mesh prefilters, afterfilters, and replacement parts come through an authorized Parker distributor, priced off the factory list and shipped anywhere in the country.
At a glance
One unicell instead of two separate stages
On most precipitators the ionizer and the collection cell are separate components you pull, wash and reinstall separately. The SGN merges them. Parker calls it a single ESP unicell, and the practical effect is fewer pieces coming out of the cabinet on wash day at airflows where a smaller family would need three or four boxes.
The body is fully welded with toolless door latches and quick access to the motor and blower section. Parker builds it ducted or unducted, and it will machine mount, wall mount or ceiling hang depending on what your bay allows.
What you are really buying is a very low consumable bill in exchange for a wash schedule somebody has to keep. That trade is the whole conversation, and it should happen before a model number does.
- ModelsSeven frames, SGN121 to SGN322
- Airflow2,200 to 9,000 CFM
- Motor2 to 10 hp, or no blower
- EfficiencyUp to 95% at 0.3 µm, single pass
- CleaningWashable unicell, no consumable
- Configurations62 orderable
- Ionizer10.0 to 11.8 kVDC
- Collection cell5.0 to 7.5 kVDC
- Drain1.5 in. FPT
The models
Three frame sizes, and then whether you take the blower
Parker builds the SGN on three frames. The frame sets your airflow band. Whether the unit ships with its own blower sets the weight, and on a ceiling hang the weight is usually the number that decides the job.
| Frame | Airflow | Motor | Weight, with blower | Weight, no blower |
|---|---|---|---|---|
| SGN121 | 2,200 to 3,000 CFM | 2 to 3 hp | 550 lbs | 250 lbs |
| SGN122 | 2,200 to 3,000 CFM | 2 to 3 hp | 800 lbs | 500 lbs |
| SGN12T | 2,200 to 3,000 CFM | 2 to 3 hp | 900 lbs | Not published by Parker |
| SGN221 | 4,000 to 6,000 CFM | 3 to 7.5 hp | 875 lbs | 425 lbs |
| SGN222 | 4,000 to 6,000 CFM | 5 to 7.5 hp | 1,300 lbs | 850 lbs |
| SGN321 | 6,600 to 9,000 CFM | 7.5 to 10 hp | 1,275 lbs | 625 lbs |
| SGN322 | 6,600 to 9,000 CFM | 10 hp | 1,900 lbs | 1,250 lbs |
Read the two letter suffix and the list gets short. Parker’s key: the first letter is the inlet, the second is the blower. F is a Mist-Stop inlet, N is no inlet, P is a perforated inlet. B comes with a blower, X comes without. So an SGN221-FB is the 22 frame with a Mist-Stop inlet and a blower, and an SGN221-NX is the same frame bare, for when you are supplying your own fan or ducting into an existing system. T is the T-shape build.
The blower is worth 300 to 650 lbs. Compare SGN321 at 1,275 lbs with its blower against 625 lbs without. Parker’s catalog puts the family between 29 and 86 in. high, 51 and 53 in. wide, and 22 and 124 in. deep, so the depth is where the big builds grow. Both numbers are worth checking against your structure and your bay before the order rather than after.
What you choose
Eight decisions, 62 orderable combinations
Parker’s SGN order code is positional, and each position is a real choice about your installation rather than a catalog flourish. This is what sits behind that 62 figure, and it is why an SGN quote should name every position rather than a frame alone.
| Choice | Options | What it changes |
|---|---|---|
| Frame | 12, 22, or 32 | Your airflow band |
| Passes | Single, double, or triple pass ESP cell | Removal efficiency and unicells to wash |
| Inlet | Mist-Stop, perforated, or none | What reaches the unicell, and how evenly |
| Inlet collar | Blank collar or a selected duct diameter | How your duct lands on the cabinet |
| Blower | High static, low static, or none | Whether you supply the fan |
| Motor | 2, 3, 5, 7.5, 10 hp, or none | Static pressure you can overcome |
| Voltage | 208, 230, 460, or 575 | What is at the wall |
| Airflow direction | Left to right, right to left, or center exhaust | Which side the inlet and discharge land on |
A part number like SGN221-FB34L reads as the 22 frame, Mist-Stop inlet, blower included, 3 hp, 460 volt, left to right. Parker’s power packs accept 90 to 130 VAC at 60 Hz; a unit ordered without a blower needs a 115 volt supply only, which is worth knowing before an electrician quotes the drop.
Airflow direction is not a detail. Left to right, right to left and center exhaust are different units, not a field adjustment. Get it wrong and the inlet faces the wall. It is the single most common thing to fix on a submittal, so we ask which way the duct comes in before anything else.
What comes in the box, and what gets added to it. Parker supplies the SGN complete with fully interlocked energy limiting UL recognized component power packs, mechanical prefilters, unicell construction, afterfilters, indicator lights and interlock switches. Three items are picked separately rather than assumed: the pulley drive set, the inlet collar in the diameter your duct actually is, and the drain loop trap or drain bottle. We put all three on the quote by name so the unit arrives able to run, instead of arriving and then needing a second order.
Media and filtration
Single, double or triple pass is the efficiency decision
Parker publishes efficiency at the line level rather than per model: a single pass SmogHog ESP removes up to 95% of 0.3 micron particles, with that figure independently verified in accordance with EN 1822-5. Adding passes raises it. The SGN and SHN brochure cites recirculation efficiencies up to 99% where the cleaned air comes back into the plant.
The stages are simple and mostly reusable. A mechanical prefilter takes the first load, either Mist-Stop coalescing or a perforated plate depending on how oily and how heavy your mist actually is. The unicell does the work. An afterfilter finishes the discharge. Nothing in that path is a consumable in normal service; the unicell washes and goes back in.
Parker’s published option list for the SGN is where a job gets tuned: application-specific power packs, dual polarity, high or low static pressure blowers, inlet and outlet plenums, odor control modules, motor starters, drain bottles and drain loop traps, and the single, double or triple pass cell arrangement. If your air returns to a space where people work all shift, that option list is where the conversation goes.
Cleaning and ownership
The wash is the deal you are making
How the unicell gets cleaned
Parker’s SGN manual calls for wash water at 140 to 170 degrees F, not to exceed 180, with an alkaline detergent carrying a buffering agent to protect the aluminum. The recommended concentration is 5%, which is a 20 to 1 mix.
Do not mix caustic and alkaline detergents, and use nonflammable cleaners. Everything has to be dry before the unit runs again. A wet cell is a dead short, and that is the most common way a good collector comes back reading as broken.
How often
Parker gives a real interval on this family, which is unusual in the line: components should be cleaned on a one to three month interval, with where you land inside it set by the application.
That range is wide for a reason. A unit over a row of screw machines running straight oil all shift sits at the one month end. A unit over machines that run a few days a week sits at the three. We set your first interval from your hours and your coolant, then adjust it after the first two washes.
The thing worth saying plainly: if nobody owns that schedule, this is the wrong family and the media side of the line will serve you better. We would rather sell you the machine your crew will actually keep running.
Hanging it, and what you supply. Parker specifies half inch all threaded rod anchored to adequate roof trusses, with rod length kept to a minimum and 36 inches preferred. Allow 36 inches of clearance for door swing and component access, and 18 inches above for the electrical junction boxes. Units can be supported from underneath instead, with care taken on the drain connections and sump integrity. All SGN units carry a 1.5 inch FPT drain. Parker expects the main electrical starter with push button station, and the wiring to local and national code, to be supplied by the customer, so those go on our quote rather than turning up as a surprise at install.
A hard boundary
Charged plates and combustible material do not go together
Parker’s SGN manual is direct about it: do not collect emissions which are explosive, do not use in explosive atmospheres, and keep flammable materials and vapors such as gasoline away from the unit. We repeat that here rather than softening it.
Parker’s manual also carries this notice word for word: pursuant to National Fire Protection Agency standards, the owner or user is required to test their dust mixtures to evaluate and understand potential combustion or deflagration hazards that may exist.
NFPA 660 took effect January 1, 2026 and consolidated NFPA 61, 484, 652, 654, 655, and 664. NFPA 68 for venting and NFPA 69 for explosion prevention remain separate referenced standards. Your dust hazard analysis has to be reviewed at least every five years and whenever the process changes.
If any part of your process makes combustible dust, that process needs a dust collector engineered for it rather than a mist collector doing double duty. Metal grinding sits in this category more often than shops expect, and aluminum, magnesium, titanium and zirconium go to wet collection under NFPA 660’s stated preference.
We coordinate the DHA and testing process and prepare documentation your qualified professional engineer reviews and stamps. The DHA itself is completed by you or by a qualified third party. We do not author it and we do not stamp drawings.
What it is built for
Processes Parker names for the SGN
Brazing, casting, cold forming, drilling, flame cutting, forging, gear cutting, grinding, heat treating, induction heating, lathes, milling, plastic and rubber forming, quenching, screw machining, soldering, threading, vacuum pumps, welding, wet grinding, and wire drawing.
Parker’s own catalog files the SGN against mist, smoke and wet particulate, and lists it as both a ceiling mount and a direct mount ESP. That combination is the tell: this is the machine you reach for when several sources feed one collector, or when one large source produces more than a machine mount can carry.
On our floors it lands most often in machining, tooling and CNC where a row of spindles ducts to one unit, in welding and metal fabrication on oily or coated stock, and in aerospace manufacturing, where mist carryover shows up as a quality problem before anybody calls it an air quality problem.
Fit check
When the SGN is not right for you
Nobody is going to wash the unicell
Parker gives a one to three month interval, which means somebody owns that date. An electrostatic collector that never gets cleaned is an expensive fan. If your PM program is already stretched, the media side of the line asks less of your crew and we will price that instead.
One machine is the whole problem
The SGN starts at 2,200 CFM. If the mist is coming off a single CNC enclosure, this is more machine and more installation than the job needs. The MSH machine mount sits on the machine, runs on single phase, and costs a fraction of the install.
You are between about 1,000 and 2,200 CFM
That band belongs to the SHN, which runs from 1,000 CFM up to about 5,500 and hangs in more places. Where the two families overlap we compare them honestly on your numbers rather than defaulting to the bigger one.
Your contaminant is dry dust
Grinding, sanding, sawing and dry cutting are dust collector work, and a precipitator sized for aerosol is the wrong machine. See the Parker DustHog line.
Your roof will not take it
An SGN322 is 1,900 pounds hanging from your structure on half inch rod. If the building will not carry it, that is a real constraint and it is better found now. A bottom supported install is often the answer, and we check the structure during the assessment rather than at the lift.
SGN questions
How much air does the SGN move?
From 2,200 CFM on the 12 frame up to 9,000 on the 32 frame. Parker publishes it as a band per frame rather than a single figure, because where you land inside it depends on your static pressure and how the unit is ducted.
What is a unicell, and why does it matter?
On most precipitators the ionizer and the collection cell are separate components. The SGN combines them into one, which Parker calls a single ESP unicell. It means fewer pieces to pull and wash, and it is what lets this family carry high airflow without multiplying cabinets.
What do the SGN suffixes mean?
The first letter is the inlet and the second is the blower. F is a Mist-Stop inlet, N is no inlet, P is a perforated inlet. B ships with a blower, X ships without. T is the T-shape build.
How often does an SGN need cleaning?
Parker publishes a one to three month interval, set by the application. The wash itself is 140 to 170 degrees F, not to exceed 180, with an alkaline detergent carrying a buffering agent at a 5% concentration, which is 20 to 1. We set your first interval from your hours and your coolant, then adjust after the first couple of washes.
Can it be ceiling hung?
Yes, and that is a common install. Parker specifies half inch all threaded rod into adequate roof trusses, with rod length kept to a minimum and 36 inches preferred. Allow 36 inches for door swing and 18 inches above for the electrical junction boxes. Units can also be supported from underneath, with care on the drain connections and sump.
What voltages does it come in?
Parker lists 208, 230, 460 and 575 volt builds. The power packs themselves accept 90 to 130 VAC at 60 Hz, and a unit ordered without a blower needs only a 115 volt supply, which changes what your electrician has to run.
What do I have to supply?
Parker expects the main electrical starter with push button station, and wiring to local and national code, to be supplied by the customer. The pulley drive set, the inlet collar in your duct diameter, and the drain loop trap or drain bottle are separate line items rather than assumed inclusions. We put all of them on the quote so they are priced rather than discovered.
Tell us the machines, the ceiling, and who does your PMs
Those three answers pick the frame, the pass count, the mounting, and whether electrostatic is the right family for you at all. You get back a full part number and a firm price.
Sizing across a whole bay rather than one machine? Book a free assessment, or see the oil mist collector overview.