Paul Industries designs and builds cleanrooms for New Hampshire’s medical device and precision manufacturing sector. The important distinction, and the one that most often causes trouble when a pharmaceutical designer approaches device work, is that a device cleanroom is usually controlling particulate and bioburden rather than assuring sterility. Devices are typically sterilized after they leave the room. What the room must deliver is a product clean enough and low enough in bioburden for that terminal process to succeed.
Request a quote or call 201-450-8280
Sterilization happens later, and that changes the brief
New Hampshire’s advanced manufacturing cluster employs over 42,000 people across six sectors, and medical devices sit alongside precision optics, semiconductors and aerospace components in the same industrial base and frequently in the same buildings.
A device manufacturer’s cleanroom typically feeds a terminal sterilization step, whether ethylene oxide, gamma or electron beam. That has two consequences that pull in opposite directions.
It relaxes one requirement. The room is not the last line of defense against a viable organism, because the sterilization process is. An aseptic pharmaceutical filling room has nothing downstream; a device cleanroom does.
It tightens another. Sterilization kills organisms; it does not remove them, and it does nothing at all to particulate. A dead organism on an implant is still a pyrogen source, and a particle on a device is still a particle when it reaches a patient. So the room has to deliver low bioburden going in, because sterilization validation depends on the starting count, and it has to deliver genuine particulate cleanliness because nothing downstream will.
That is why bioburden monitoring on a device line is not a formality. The sterilization cycle was validated against an assumed bioburden level, and a room whose bioburden has drifted upward is quietly eroding the safety margin of a process that is still passing its own parameters. The room and the sterilizer are one system, and they are usually owned by different people.
People and particles, in a room full of machinery
Device manufacturing puts more equipment and more manual operations into a cleanroom than pharmaceutical filling does, and both are particle sources.
Operators generate particles continuously. More people, doing more manipulation, over longer periods. Gowning appropriate to the class, gowning rooms sized for the actual headcount at shift change rather than the average, and a layout where the correct sequence is also the natural one.
Machinery generates particles where it moves. Cutting, forming, assembly, laser marking and automated handling all shed, and the shedding is local to the operation. Extraction at the source is far more effective than diluting across the room, and it costs a fraction of the air handling that dilution would require.
Materials arrive dirty. Components, packaging and tooling all bring particulate in. Entry via pass-through with cleaning appropriate to what is entering, and packaging removed at the boundary rather than inside.
Electrostatic discharge is a parallel concern. Many devices contain electronics, and static both damages them and attracts particles to surfaces. Flooring, humidity control and grounding belong in the environmental specification rather than being handled separately by an electrical contractor.
| Continuous load | New Hampshire per year | At the 8.13 cent US average |
|---|---|---|
| 50 kW | $71,000 | $35,609 |
| 100 kW | $142,000 | $71,219 |
| 200 kW | $283,999 | $142,438 |
At 16.21 cents per kilowatt-hour, 1.99 times the 8.13 cent national average (EIA, 2024), New Hampshire cleanroom running costs are roughly double what the same room would cost in the Midwest or the South. That makes three decisions unusually valuable here.
Classify only what needs classifying. A common and expensive pattern is a large uniformly classified space where only part of the process requires it. Localized protection over the critical operations, in a lower-classified surrounding room, delivers the same product cleanliness for a fraction of the conditioned air. This should be settled at layout stage because it is difficult to retrofit.
Extract at source rather than dilute. As above, and the energy argument reinforces the contamination one.
Review inherited air change rates. Many rooms run rates derived from a rule of thumb rather than from their actual particle load. Reductions are genuinely available and they must be demonstrated against in-operation performance and recovery rather than simply applied, and documented as a change.
New Hampshire’s climate does offer a real advantage worth capturing: for a substantial part of the year outside air is cold enough for water-side free cooling to serve a room whose load is internally generated, which offsets part of the tariff disadvantage. The winter counterpart is that all outside air must be heated and frequently humidified, so exhaust heat recovery earns its cost more readily here than in a mild climate.
Building and qualifying
We build with sealed penetrations, coved junctions, flush glazing and finishes chosen for the cleaning agents in use, with attention to envelope sealing because in this climate leakage is a heating load as well as a contamination route. Utility penetrations are detailed as part of the room rather than punched through afterwards.
Qualification covers installation, operational and performance stages, with classification to ISO 14644-1, recovery testing, filter integrity, airflow visualization where warranted, and pressure cascade verification under realistic door movement, with ISO 14644-2 governing the ongoing monitoring plan. Under 21 CFR 820 and ISO 13485 the room forms part of the validated manufacturing environment, so the qualification records feed the device master record rather than sitting in a facilities file, and assembling them in that shape during the project is considerably cheaper than reconstructing them later.
Standards referenced: ISO 14644-1 · EIA electricity price data · 21 CFR 820 · ISO 14644-2 · ISO 13485 · ASME BPE · USP 797 · USP 800
Frequently asked questions
Do you build cleanrooms for New Hampshire device manufacturers?
Yes, across Manchester, Nashua, Salem, Portsmouth and statewide: design and construction, air handling and controls, localized protection over critical operations, source extraction, monitoring and the full qualification package to ISO 14644-1 and ISO 14644-2.
How is a device cleanroom different from a pharmaceutical one?
It usually controls particulate and bioburden rather than assuring sterility, because devices are typically terminally sterilized after leaving the room. An aseptic filling room has nothing downstream; a device room does, which relaxes one requirement and tightens others.
If we sterilize afterwards, why does bioburden matter?
Because the sterilization cycle was validated against an assumed starting count. A room whose bioburden has drifted upward erodes the safety margin of a process that is still passing its own parameters, and sterilization kills organisms without removing them, so a dead organism on an implant remains a pyrogen source.
What about particles specifically?
Sterilization does nothing to them. A particle on a device when it leaves the room is a particle on the device when it reaches a patient, so particulate cleanliness has to be delivered by the room because nothing downstream addresses it.
What generates most of the particles?
Operators and machinery. Device work puts more people doing more manipulation and more equipment performing cutting, forming, assembly and marking into the room than pharmaceutical filling does, and machine shedding is local to the operation, which is why source extraction beats dilution.
Should the whole room be classified?
Usually not, and this is the expensive default. Localized protection over the critical operations within a lower-classified surrounding room delivers the same product cleanliness for a fraction of the conditioned air. At New Hampshire tariffs that difference is substantial, and it has to be settled at layout stage.
How much more does a cleanroom cost to run here?
Roughly double what the same room costs in the Midwest or the South. New Hampshire industrial electricity is 16.21 cents per kilowatt-hour against a national average of 8.13, a factor of 1.99 (EIA, 2024), on a load that runs every hour of the year.
Does the climate help or hurt?
Both. For a substantial part of the year outside air is cold enough for water-side free cooling to serve an internally generated load, which offsets part of the tariff disadvantage. In winter all outside air must be heated and often humidified, which makes exhaust heat recovery earn its cost more readily than in a mild climate.
Can we reduce our air change rate?
Often, since many rooms run rates from a rule of thumb rather than their actual particle load, and fan power rises steeply with flow. Any reduction must be demonstrated against in-operation performance and recovery rather than simply applied, and documented as a change.
How do I get a quote for a New Hampshire cleanroom?
Use the form on this page or call 201-450-8280. Useful inputs are the classification required and which operations genuinely need it, room footprint and internal heat loads, headcount and equipment in the space, your electricity tariff, and whether terminal sterilization follows.
What ISO class do medical device assembly rooms usually need?
Commonly ISO 7 or ISO 8, set by the device's bioburden and particulate requirements and the sterilization validation, rather than by a fixed rule. Higher classes are used for specific products, and the class is justified in the design history file.
How does the sterilization method affect the cleanroom requirement?
Ethylene oxide, radiation and steam each have a validated bioburden assumption, and the cleanroom has to keep bioburden at or below it. A more robust sterilization cycle tolerates a higher starting bioburden, which is why the room and the sterilization validation are designed together.
How is bioburden monitored in a device cleanroom?
By periodic bioburden testing of product, environmental monitoring of surfaces and air, and personnel monitoring, with limits set from the sterilization validation. The room's job is to keep those results within limits consistently.
How are production machines inside a device cleanroom kept from contaminating it?
By specifying enclosed drives, sealed bearings and low-particle materials, positioning machines so that their exhaust and heat are handled, and treating machine maintenance as a controlled activity with cleaning afterward. Machinery is usually the largest particle source after people, and it is selected for the room rather than placed in it.
How is a device cleanroom laid out for people and product flow?
With gowning and entry at one end, product moving through assembly to packaging without doubling back, and packaging materials entering through a controlled route. Crossed flows and back-tracking are where contamination and mix-ups happen.
How does packaging fit into the classified area?
Primary packaging is done inside the classified area so that the sterile barrier is closed in a controlled environment, and the packaging materials are stored and introduced under control. The sealed sterile barrier is the endpoint of the room's responsibility.
Do device cleanrooms need humidity control?
Usually, within a moderate band, for personnel comfort, electrostatic control and material behaviour. Winter air in New Hampshire is dry enough that humidification is often needed, which is a water quality and maintenance consideration.
How is electrostatic discharge controlled in a device cleanroom?
Through humidity control, grounded flooring and workstations, ionisation where needed and garment selection, because static attracts particles and damages electronic components in devices that contain them. Controls are chosen for the product.
What does 21 CFR 820 require of the cleanroom?
The quality system regulation requires environmental control where it affects product quality, with the controls documented, monitored and verified. The cleanroom's design, its monitoring and its maintenance are part of the quality system record.
How is a device cleanroom qualified?
By verifying airflow, filtration, pressure, temperature, humidity and particle counts against the design, then by monitoring under operating conditions to show the room performs with people and equipment running. The qualification is referenced in the device history.
How is a cleanroom built inside a shared manufacturing building?
As a sealed room-within-a-room with its own air handling and a defined boundary, with attention to what the surrounding building emits: machining oils, welding fumes, dust. Intake location and pre-filtration are chosen to keep the shared building's contamination out.
Can a smaller device maker justify a cleanroom?
Yes. A modest ISO 8 room with good gowning and flow is within reach of small manufacturers, and it is often required by customers and by the sterilization validation. The size is set by the operations, not by the company.
What cleanroom energy measures pay back fastest at New Hampshire tariffs?
Reducing air change rates to what the room's particle load needs, setting back the room when unoccupied, recovering heat from exhaust in winter, and using variable speed fans. New Hampshire's industrial power price makes each of these pay back faster than in most states.
How does the cleanroom relate to the parts cleaning line?
Cleaned parts enter the cleanroom for assembly, so the cleaning line's output condition and the transfer into the room are part of the contamination control. Parts left in an open shop between cleaning and assembly recontaminate.
What is the commonest device cleanroom problem you see?
Air change rates copied from pharmaceutical practice that the process does not need, driving energy cost, and gowning procedures that do not match the room's classification. Both are fixed by designing to the device's actual requirement.
Shared buildings, and the contamination nobody designed for
One characteristic of New Hampshire’s manufacturing base creates a problem worth naming, because it arises from the cluster’s strength rather than from any failure of design.
The same industrial parks, and frequently the same buildings, host medical device makers alongside precision machining, optics, electronics and aerospace component work. Those neighbours are excellent for the supply chain and they generate things a device cleanroom exists to exclude.
Three transfer routes account for most of it.
Shared outside air. A cleanroom’s intake draws from the building’s surroundings, and if a neighbouring tenant is grinding, welding, plating or running solvent operations, that is what arrives at the filters. Particulate is handled by filtration. Molecular contamination, solvent vapor, acid mist from a plating line, is not, because a particle filter is not a chemical filter. Intake position relative to neighbouring exhausts is a decision worth making deliberately rather than accepting wherever the ductwork reached.
Shared services and structure. Common roof voids, shared risers, an unsealed party wall or a pass-through between tenancies all move air between spaces that were leased separately. A pressure regime that holds against the outdoors can be defeated by an adjacent unit running a large extract system.
Oil and machining residue on incoming components. This is the one that reaches product directly. Machined parts arrive carrying cutting fluid, and a device cleanroom receiving components straight from a machine shop is receiving a contaminant the room’s air handling has no bearing on at all. The control is the incoming cleaning process described on our New Hampshire precision cleaning page, and a defined boundary at which packaging comes off.
The engineering responses are ordinary once the routes are recognized: intake located and, where the neighbourhood warrants it, chemically filtered; the tenancy envelope sealed and pressure-tested rather than assumed; and incoming material treated as dirty until it has been through a defined cleaning step. None is expensive at design stage and all are awkward afterwards.
We survey for these routes on existing installations, which usually means measuring pressure relationships across tenancy boundaries and looking at where neighbouring exhausts discharge relative to intakes. It is a half-day exercise and it explains a meaningful share of the unexplained excursions we are asked about.
Planning a device cleanroom in New Hampshire?
Tell us which operations genuinely need classified space. At double the national energy cost, classifying the whole room is the most expensive default available. Call 201-450-8280 or use the form below.