SmogHog PSG · Modular Roof, Ceiling and Plenum Electrostatic
SmogHog PSG Kitchen and Process Emission Precipitator
Grease off a hood line, smoke off a wood fired oven, oil smoke off a process. The PSG is built in compartments rather than sizes, so the machine grows with the exhaust instead of being replaced by a bigger one, and it washes its own cells in place rather than making somebody pull them.
Your PSG unit, collection cells, prefilters, odor modules, and replacement parts ship from us anywhere in the country, with one stated price on your quote.
At a glance
Built out of compartments, not out of model sizes
A PSG is an array. Each compartment carries a unicell and handles roughly 1,100 CFM, and SmogHog stacks them high and wide to reach your exhaust volume. A single compartment is a small hood. Five high by five wide is 27,500 CFM. Same cells, same wash system, same spare parts across the whole range.
The cells clean in place. Spray nozzles, an automated wash cycle and detergent injection run inside the cabinet, which is the difference between a maintenance task somebody has to schedule and one that happens on a timer overnight.
SmogHog builds it fully welded with toolless door latches and quick access to the motor and blower section, ETL listed, and it can be equipped to work with Ansul fire suppression.
- ModelsModular, 1 to 5 high by 1 to 6 wide
- Airflow750 to 30,000 CFM
- MotorSelected to the build, or no blower
- EfficiencyUp to 95% at 0.3 µm, single pass
- CleaningAutomated in place cell wash
- ConfigurationsSingle or double pass, 13 published layouts
- Ionizer11.0 kVDC nominal
- Collection cell5.5 kVDC nominal
- DrainPlumbed to the wash system
The models
Count the compartments and you have the airflow
SmogHog names a PSG by how it is stacked. PSG-22-1 is two compartments high, two wide, single pass. Multiply the compartments by roughly 1,100 CFM and you have the nominal airflow. These are the layouts SmogHog publishes.
| Layout | Compartments | Nominal airflow |
|---|---|---|
| 1 high, 1 wide | 1 | 1,100 CFM |
| 1 high, 2 wide | 2 | 2,200 CFM |
| 1 high, 3 wide | 3 | 3,300 CFM |
| 2 high, 2 wide | 4 | 4,400 CFM |
| 2 high, 3 wide | 6 | 6,600 CFM |
| 2 high, 4 wide | 8 | 8,800 CFM |
| 3 high, 3 wide | 9 | 9,900 CFM |
| 2 high, 5 wide | 10 | 11,000 CFM |
| 3 high, 4 wide | 12 | 13,200 CFM |
| 5 high, 3 wide | 15 | 16,500 CFM |
| 4 high, 4 wide | 16 | 17,600 CFM |
| 4 high, 5 wide | 20 | 22,000 CFM |
| 4 high, 6 wide | 24 | 26,000 CFM |
| 5 high, 5 wide | 25 | 27,500 CFM |
Reading a full part number. PSG-232L-DCE is two high, three wide, double pass, left to right airflow, followed by the option code for the wash system, odor control and afterfilter selections. The part number is what belongs on a submittal, because the layout alone does not say which options are on the unit.
Duct velocity is the constraint people miss. SmogHog designs the PSG around a duct velocity of roughly 1,500 to 2,500 FPM. A unit sized correctly on CFM but fed by undersized duct will not hold its published efficiency, because the air is moving through the cells faster than the field can charge it. We check the duct sizing before we check the model.
What you choose
Seven decisions behind a PSG part number
The layout gets you to airflow. Everything after it is about your particulate, your code path and your building.
| Choice | Options | What it changes |
|---|---|---|
| Layout | 1 to 5 high by 1 to 6 wide | Your airflow |
| Passes | Single or double | Removal efficiency on heavy or sticky loads |
| Cell washing | In place wash system, or manual removal | Who does the cleaning, and how often |
| Odor control | Carbon or potassium permanganate | What the neighbors smell at the discharge |
| Inlet collar | Blank collar or a selected duct diameter | How your duct lands on the cabinet |
| Blower and motor | Integral blower with selected horsepower, or none | Whether you supply the fan, and your temperature ceiling |
| Voltage | 208, 230, 460, or 575 | What is at the wall |
Airflow direction is not a detail. Left to right and right to left are different units, not a field adjustment. On a roof curb, getting it backwards is an expensive morning. We ask which way the duct comes in before anything else.
The wash system is a plumbing job, not just a purchase. An in place wash needs water at 40 to 50 psi, hot water at 140 to 170 degrees F, detergent supply, and a drain the cabinet can discharge to. Those trades are contracted by you and get scheduled alongside the unit, and we list those requirements on the quote rather than leaving them to be discovered at startup.
Media and filtration
Charge it, collect it, then deal with what you can still smell
The ESP stage charges the particulate and strips it from the airstream, catching submicron contaminants at low pressure drop. SmogHog publishes the line level figure of up to 95% of 0.3 micron particles on a single pass, independently verified in accordance with EN 1822-5. On heavy loading, wood fired cooking and smoking being the examples SmogHog names, a double pass raises removal further.
Odor is a separate problem from particulate, and the PSG treats it separately. Carbon or potassium permanganate modules go downstream of the collection stage. If your exhaust discharges near a patio, a hotel window or a parking structure, that module is usually the reason the project succeeds or generates complaints.
Because the cells are washable rather than consumable, there is no recurring filter purchase in normal service. What you buy instead is detergent, water and a wash cycle that runs on schedule.
Cleaning and ownership
A wash that runs overnight instead of a filter change that runs your morning
What the cycle actually does
SmogHog’s published wash sequence runs about a minute of fan coast down, a half minute pre-rinse, two minutes of detergent wash, a minute and a half rinse, two minutes of drain, then roughly thirty minutes of fan dry.
Water goes in at 40 to 50 psi and 140 to 170 degrees F with detergent injected at 20 to 1. The unit has to be dry before it energizes again, which is what the long fan dry is for. A wet cell is a dead short.
How often
On grease service SmogHog calls for a daily wash. That is not a suggestion you can stretch on a hood line, and it is the single biggest reason the in place wash system exists rather than a pull and soak routine.
Set against a filter based hood system, the trade is real: no recurring media purchase, no crew pulling greasy panels at 6 a.m., in exchange for a nightly automated cycle and the plumbing to support it.
If your kitchen has no water supply, no drain and no interest in a nightly cycle, say so early. That is a different conversation and it is better had before the order.
Temperature ceiling. SmogHog limits the PSG to 140 degrees F entering air, and 120 degrees F on units with integral blowers. Charbroilers, wood fired ovens and long uninsulated duct runs are where that gets tested. If your exhaust runs hotter, the fix is upstream of the collector, and it belongs in the design rather than in a service call.
The code path
Kitchen exhaust is NFPA 96 work, and dust is a different machine
Commercial cooking exhaust falls under NFPA 96, and that is the standard your inspector will be holding. SmogHog builds the PSG to that path and lists it against UL 8782, UL 762, UL 710 and UL 867, with ETL listing and the option to work with an Ansul fire suppression system. We put the listings on the submittal because that is what your inspector reviews.
An electrostatic precipitator is not a combustible dust answer. If any part of your process makes combustible dust, that process needs a dust collector designed for it rather than a precipitator doing double duty.
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. A dust hazard analysis has to be reviewed at least every five years and whenever the process changes. Flour, sugar, spice and starch handling in a food plant sit inside that scope far more often than people expect.
For your DHA, go straight to DHA Report Group and request the intake form. The DHA itself is completed by you or by a qualified third party. We do not author it and we do not stamp anything.
What it is built for
Where the PSG earns its place
SmogHog files the PSG against mist, smoke and wet particulate, and points it at high profile commercial kitchens and industrial food processing, plus high volume oil smoke and coolant emissions on the industrial side.
The kitchen work is the clearest case. A casino floor, a hotel, a stadium concourse or a hospital cafeteria all share the same problem: the exhaust discharges somewhere people are standing, and the building cannot simply vent grease laden air at them. See casinos and entertainment facilities.
On the industrial side it lands in food and supplement manufacturing where cooking, frying and smoking run as a process rather than a service line, and in machining and CNC where a central duct carries oil smoke from a whole department to one roof unit.
Fit check
When the PSG is not right for you
You have no water and no drain at the unit
The in place wash is the reason to buy this machine, and it needs hot water, pressure, detergent supply and somewhere for the discharge to go. Without that plumbing you are buying an ESP you have to hand clean, which is a worse version of a simpler unit.
Your exhaust runs hotter than 140 degrees F
That is SmogHog’s ceiling, and 120 degrees on integral blower builds. Charbroilers and wood fired equipment on short duct runs are where this shows up. It is solvable upstream, but it has to be solved in the design rather than after the unit is on the curb.
One machine in a shop is the whole problem
The PSG is a building scale unit on a roof or in a plenum. If the mist is coming off one or two CNC enclosures, the MSH machine mount or the SHN is a fraction of the install.
Your contaminant is dry dust
Grinding, sanding, sawing and dry powder handling are dust collector work, and a precipitator sized for aerosol is the wrong machine. See the DustHog line.
You want building air handling
This is exhaust treatment, not HVAC. It cleans what a hood or a process duct already captured. If the question is comfort or general building air, that is a different family and a different design.
PSG questions
How much air does a PSG move?
SmogHog publishes the family from 750 to 30,000 CFM. Because it is modular, the practical way to size it is by compartment: each one handles roughly 1,100 CFM, so a two high by three wide build is about 6,600 CFM.
What does the model number mean?
PSG-22-1 is two compartments high, two wide, single pass. A full part number adds the airflow direction and the option code for the wash system, odor control and afterfilter selections, which is why the part number rather than the layout belongs on a submittal.
Do the cells have to be pulled and washed by hand?
Not on a unit ordered with the in place wash system. Spray nozzles, an automated cycle and detergent injection clean the cells inside the cabinet. The cells are washable and reusable either way, so there is no recurring filter purchase in normal service.
How often does it wash?
On grease service SmogHog calls for a daily wash. The published cycle is roughly a minute of fan coast down, a half minute pre-rinse, two minutes of wash, a minute and a half rinse, two minutes of drain, then about thirty minutes of fan dry.
How hot can the air be?
SmogHog limits entering air to 140 degrees F, and 120 degrees F on units with integral blowers. If your exhaust runs hotter, that gets solved upstream of the collector during design.
Does it meet kitchen exhaust code?
Commercial cooking exhaust falls under NFPA 96. SmogHog lists the PSG against UL 8782, UL 762, UL 710 and UL 867, it is ETL listed, and it can be equipped to work with an Ansul fire suppression system. We put those listings on the submittal because that is what your inspector reviews.
What about the smell, not just the smoke?
Odor is treated separately from particulate. SmogHog offers carbon or potassium permanganate modules downstream of the collection stage. Where the discharge sits near a patio, a hotel window or a parking structure, that module is usually what decides whether the project generates complaints.
Tell us the exhaust volume, what is cooking, and where it discharges
Those three answers pick the layout, the pass count, the odor control and whether the wash system is worth it. You get back a full part number and a firm price.
Sizing a whole building rather than one hood? Book a free assessment, or see the oil mist collector overview.