Paul Industries designs, builds and qualifies cleanrooms across Ohio. Two industries in this state use the word cleanroom to mean genuinely different rooms. A pharmaceutical suite is built against things that are alive, and its monitoring counts colony-forming units. An electronics cleanroom is built against particles that have no biological significance whatsoever, at sizes a pharmaceutical monitoring program does not measure. Ohio is where a contractor is asked for both, and the wrong template produces an expensive room that solves the other industry’s problem.

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Pharmaceutical target Viable organisms, monitored as colony-forming units
Electronics target Non-viable particles, at sizes with no biological meaning
Airflow Mixed or turbulent for most pharmaceutical suites; unidirectional for the strictest electronics work
Shared framework ISO 14644-1 classification and ISO 14644-2 requalification
Industrial power 7.10 cents/kWh, 0.87x the US average of 8.13 (EIA, 2024)
Reviewed September 2026, against current state code and EIA 2024 energy data

Clean against what?

ISO 14644-1 classifies a room by airborne particle concentration at stated sizes. Both industries use it, which is why the confusion persists. What differs is everything the classification is being used to protect against.

A pharmaceutical cleanroom is a microbiological control. The particle count is a useful proxy, because organisms travel on particles, but the thing being controlled is contamination of product by viable organisms, and the monitoring program that actually matters counts them: settle plates, active air sampling, surface contact plates, personnel monitoring. Gowning exists because people shed skin and the organisms on it. Disinfection regimes, sporicidal rotation and bioburden control on materials entering the room all follow from that.

An electronics cleanroom is a particle control. A particle of any origin landing on a wafer or an optical surface at the wrong moment causes a defect, and whether the particle was ever alive is of no consequence. What matters is size and count, at scales far below what a pharmaceutical program concerns itself with, and the room is designed to remove particles from air continuously and to prevent their generation in the first place. Nobody is culturing anything.

The design divergence that follows is substantial.

Airflow pattern. Most pharmaceutical suites use mixed airflow, with unidirectional protection over critical open-product operations. The strictest electronics work uses unidirectional flow across the whole working area, with air moving down through the space and returning through a raised floor. That is a different building, not a different setting.

Materials and people. Pharmaceutical gowning controls what the human being sheds biologically. Electronics gowning controls particle generation and frequently electrostatic behavior as well. Wipes, garments and consumables are selected against different criteria, and a pharmaceutical-specified consumable may shed more particles than an electronics room tolerates while being entirely correct for its own application.

Cleaning. Pharmaceutical cleaning uses disinfectants, with efficacy against organisms as the requirement and residue management as the complication. Electronics cleaning targets particle removal, and a disinfectant leaving residue would be a defect source rather than a control.

The shared ground is real and worth stating: classification testing, filter integrity, airflow measurement, pressure differentials and recovery testing under ISO 14644-1 and -2 are common to both, and a contractor competent at qualification is competent at qualification. It is the design intent that does not transfer.

Two rooms, one standard

Pharmaceutical suite compared with an electronics cleanroom
 PharmaceuticalElectronics
Contamination of concernViable organismsNon-viable particles of any origin
Monitoring that mattersColony-forming units, plus particle countsParticle counts at fine sizes
Typical airflowMixed, unidirectional over critical operationsUnidirectional across the working area at the strictest levels
Gowning purposeContain what people shed biologicallyContain particles, often with electrostatic control
Cleaning agentsDisinfectants, with residue managedParticle removal; residue is itself a defect source
Shared with the otherISO 14644-1 classification and ISO 14644-2 requalification, filter integrity, airflow and recovery testing
Fan power by air change rate, modelled on a 1,000 sq ft room with a 10 ft ceiling at 1 W per CFM, Ohio at 7.10 cents/kWh
Air changes per hourContinuous loadPer year
203.3 kW$2,073
305.0 kW$3,110
6010.0 kW$6,220

Unidirectional electronics rooms sit well above this range, because moving air down through an entire working area at controlled velocity is a far larger fan duty than achieving an air change rate in a mixed-flow room. That is the single largest cost difference between the two kinds of room, and it is why the airflow pattern decision should be made on process need rather than on which specification sounded more impressive.

What Ohio actually builds

It is worth being concrete about demand rather than implying more than exists. Ohio carries pharmaceutical manufacturing and packaging, food and ingredient processing, medical device work, and a substantial base of specialty manufacturing, optics and electronics, alongside university and research installations. The large semiconductor project in Licking County is real and substantial but slower than originally announced, with the first fabrication module now targeted around 2030 to 2031.

The practical consequence is that most Ohio cleanroom work over the next few years is fit-out and upgrade within existing buildings rather than greenfield construction, and a meaningful share of it is retrofitting rooms whose original specification no longer matches what is being made in them. That second category is where the pharmaceutical and electronics distinction earns its money, because a room specified for one and now used for the other will usually be both over-specified and under-specified at the same time.

Standards referenced: ISO 14644-1 · ISO 14644-2 · EIA electricity price data · ASME BPE

Frequently asked questions

Do you build cleanrooms in Ohio?

Yes, statewide across Columbus, Cleveland, Cincinnati, Dayton and Toledo: envelope, mechanical, pressure regime, finishes, utilities and qualification to ISO 14644-1 and -2. We build for pharmaceutical, medical device, food and electronics applications, and we establish which contamination you are controlling before anything else, because that determines the design.

How is an electronics cleanroom different from a pharmaceutical one?

By what it is protecting against. A pharmaceutical suite is a microbiological control that uses particle counts as a proxy while monitoring colony-forming units. An electronics room controls particles regardless of origin, at sizes with no biological meaning, and nobody cultures anything. The classification standard is shared; the design intent, gowning, cleaning and airflow pattern are not.

Do both use ISO 14644?

Yes, and that is the source of most confusion. ISO 14644-1 classifies by airborne particle concentration and ISO 14644-2 governs requalification, and both industries use them. Classification testing, filter integrity, airflow measurement, pressure differentials and recovery testing are genuinely common ground. What does not transfer is what the room was designed to achieve.

What is unidirectional airflow and do we need it?

Air moving in a single direction at controlled velocity across the working area, usually downward with return through a raised floor. Most pharmaceutical suites use mixed airflow with unidirectional protection over critical open-product operations. Full unidirectional flow is a substantially different and more expensive building, and it should be chosen because the process requires it rather than because it sounds more rigorous.

Can a pharmaceutical room be converted for electronics use?

Sometimes, and it usually needs honest assessment rather than optimism. Such a room is frequently both over-specified and under-specified at once: it carries gowning, disinfection and monitoring provisions the new use does not need, while lacking the airflow pattern, consumable selection and electrostatic control it does need. The conversion cost is mostly in mechanical work rather than finishes.

Which consumables should we use?

Ones selected against the contamination you are controlling. A wipe or garment entirely correct for a pharmaceutical suite may shed more particles than an electronics room tolerates, and a disinfectant that leaves a residue is a control in one setting and a defect source in the other. This is an area where inherited purchasing habits quietly undermine a correctly built room.

How do we choose the right classification?

From the process and its risk, then demonstrate it with recovery testing rather than adopting the top of a guidance range. Establish how quickly the room returns to its limits after a defined disturbance at the proposed rate, and if it recovers comfortably within an acceptable time, you have an evidenced basis and a documented rationale. That evidence is what an auditor asks for and what defends the operating cost.

Can you certify and recertify existing Ohio rooms?

Yes, to ISO 14644-1 and -2. Where a room keeps failing, we would rather investigate than resell a test. In Ohio a recurring cause is a room whose use has changed since it was specified, so the original design is controlling the wrong thing. That diagnosis is more useful than another set of counts confirming the same result.

Does Ohio energy cost affect the design?

Modestly for mixed-flow rooms and significantly for unidirectional ones. At 7.10 cents per kilowatt-hour against a national average of 8.13 (EIA, 2024), a 60 air change room of this size is about $6,220 a year in fan energy. A unidirectional electronics room sits well above that range, because moving air down through an entire working area is a far larger duty than achieving an air change rate.

How do I get a quote for an Ohio cleanroom?

Use the form on this page or call 201-450-8280. The most useful first answer is what contamination you are controlling and what it would do to your product. Beyond that: approximate square footage, whether this is a fit-out, new build or conversion, the classification you believe you need, and the equipment going in. If a room is being repurposed, say what it was originally built for.

Do both use the same classification standard?

Both use ISO 14644 for air cleanliness, which is why the two are so often confused, but they use it at different particle sizes and alongside entirely different additional requirements. The shared standard describes one attribute of the room; everything else about the two specifications, monitoring, materials and gowning, diverges.

What is airborne molecular contamination?

Gas-phase contamination, acids, bases, condensables and dopants, at concentrations far below anything that matters in a pharmaceutical room, which can react with or deposit onto a wafer surface and ruin it. It is controlled by chemical filtration in the air handling path and by material selection, and it is invisible to particle counters entirely.

Does material selection change for electronics work?

Substantially. Materials that outgas are excluded, and silicone in particular is avoided because it migrates, deposits on surfaces and interferes with bonding and coating processes. Sealants, gaskets, lubricants, cable insulation and even marker pens become specification items. A pharmaceutical fit-out’s material list is unsuitable almost line by line.

How is static controlled?

Through grounded flooring and work surfaces, personnel grounding, ionisation where charge cannot be removed by grounding alone, and humidity control, because very dry air makes static worse. In a pharmaceutical room static is a nuisance; in electronics manufacture it destroys product invisibly, and the damage is frequently latent rather than immediate.

Do electronics rooms need tighter temperature control?

Usually much tighter, because dimensional stability, metrology and some processes are sensitive to small changes. Tolerances measured in fractions of a degree are common in metrology areas, which drives the air handling design and the control system far more than the particle classification does.

Does vibration matter?

Critically, for lithography, metrology and inspection equipment, and it has to be designed for at the building level: slab design, isolation, distance from mechanical plant and traffic. This is one of the most expensive things to correct after the fact, and it is the reason these facilities are frequently purpose-built rather than converted.

What is unidirectional airflow and is it needed?

Air moving in one direction at consistent velocity across the space, sweeping particles away rather than diluting them. It is required where the cleanliness demand is highest and the product is exposed, which in electronics is the critical process area. It is expensive to run, which is why minienvironments over the tools are often preferred to a fully unidirectional room.

What is a minienvironment and why use one?

A small enclosure maintaining very high cleanliness around the product and the tool interface, sitting inside a room of lower classification. It concentrates the expensive engineering where the wafer is exposed and lets the surrounding room be simpler and far cheaper to operate, which is the dominant approach in modern semiconductor facilities.

How is cleanliness maintained during construction?

Through a construction protocol that escalates as the build progresses: controlled entry, cleaning of materials before they enter, restrictions on activities that generate particles, and progressively stricter gowning. Electronics facilities take this considerably further than pharmaceutical projects, because contamination built into the fabric is nearly impossible to remove afterwards.

Does Ohio have demand for this work?

Central Ohio has attracted very substantial semiconductor investment, and the effect extends well beyond the fabs themselves to the supplier and support facilities that cluster around them. Those supporting facilities need high-purity gas, chemical distribution, ultrapure water and controlled environments, which is where most of the accessible work sits.

What consumables should be used?

Ones qualified for the application, because wipers, gloves, garments and packaging all shed and outgas differently. Electronics work requires low-particle, low-extractable and frequently low-silicone consumables, while pharmaceutical work prioritises sterility and microbial performance. Using pharmaceutical consumables in an electronics room introduces exactly the contamination the room exists to exclude.

What is most often underestimated on these projects?

The difference in tolerances. Teams experienced in pharmaceutical construction deliver an excellent room and are surprised by temperature stability requirements measured in tenths of a degree, vibration criteria expressed in microns per second, and material restrictions that exclude products they have used for years. The gap is in the specification, not the workmanship.

How clean does construction need to be for a high-purity build?

Progressively cleaner as the build proceeds, with a written protocol governing entry, material cleaning, permitted activities and gowning at each stage. Electronics facilities enforce this far more strictly than pharmaceutical projects because contamination sealed into the fabric, in a ceiling void or inside a duct, cannot be removed once the room is finished.

Does humidity control differ for electronics?

It tends to be tighter and for different reasons: too dry promotes static that damages product, too humid affects some processes and materials. The band is often narrower than a pharmaceutical room’s and held more precisely, which drives the air handling design considerably more than the cleanliness classification does.

What gowning applies in an electronics cleanroom?

Garments selected for low particle shedding and low outgassing, frequently with static-dissipative properties, covering more of the person than pharmaceutical gowning because the human is the dominant particle source. The emphasis shifts from sterility to shedding and charge, which changes the garment specification almost entirely.

How is a high-purity room commissioned?

With the standard classification tests plus whatever the facility’s critical parameters require: temperature stability over time, static performance, vibration measurement, and molecular contamination monitoring where processes demand it. A room commissioned only to its ISO classification has been tested against one of several attributes that determine whether it works.

Planning a cleanroom in Ohio?

Tell us what contamination you are controlling and what it does to your product. Call 201-450-8280 or use the form below.

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