Posted by Stuart Heisey on Wednesday, May 27, 2026
Environmental Control at Manufacturing Scale
Historically, many industrial facilities’ HVAC systems were designed around a simple priority: ventilate the space, remove equipment heat, and maintain acceptable working conditions. In many plants, that meant moving large volumes of air through large volumes of space—an approach often described as the “tin can with a fan.”
Even in manufacturing processes where ventilation for work or comfort is all that is required, Clean Air guidelines are making basic filtration and airflow control at the building envelope an important aspect of the manufacturing facility’s performance.
And in certain processes, environmental conditions inside the building are not just a matter of comfort or ventilation - they directly influence the manufacturing process. Industries such as pharmaceutical manufacturing, semiconductor fabrication, and certain specialty chemical processes have long relied on tightly managed conditions to maintain product quality and process stability.
What is changing is the scale at which these environments are being applied.
These conditions were traditionally confined to laboratories and cleanrooms - relatively small, tightly controlled spaces. Today, they are being applied across manufacturing environments that span hundreds of thousands of square feet.
In many modern facilities, the building itself has become part of the production process.
Scaling Laboratory Precision to Industrial Manufacturing
Large-scale manufacturing facilities are increasingly being designed to support tightly controlled environments across entire production areas. Life sciences manufacturing offers a visible example of this trend. In Pennsylvania, recent development - including activity from Eli Lilly, B. Braun, GSK, and Johnson & Johnson - points to the scale and complexity of the facilities now coming online, reflecting a broader pattern being seen across many industries.
These types of facilities illustrate the challenge: applying laboratory-level environmental control across spaces that are orders of magnitude larger than traditional cleanrooms.
Airflow must be distributed consistently across large floor areas to prevent localized variation and maintain uniform conditions. Pressure relationships - typically in the range of 0.01 to 0.05 inches of water column - must be maintained to control airflow direction and prevent cross-contamination between spaces.
Particulate Control becomes more complex at scale, with zones of turbulence or stagnation more likely. Maintaining consistent air cleanliness requires both process knowledge (industrial engineers) and air/fluid dynamics understanding (facilities engineers) to ensure contaminants are removed and do not migrate between areas.
Temperature & Humidity Stability are uniquely volatile when dealing with large volumes. A change of 1 deg F results in a 2% change in relative humidity, so if tight humidity control is necessary, systems must be able to respond to changing loads while also maintaining uniform temperature in the zone. For more on humidity, refer to our earlier article on precision humidity control in industrial facilities.
Cleanroom Classifications such as ISO 7 or ISO 8 have formalized requirements in some environments, adding defined performance criteria that must be maintained consistently across the entire space. This can be challenging in a relatively small cleanroom and is even more so when scaled up. A deep understanding of how air flows and interacts with process equipment is critical to success.
Mechanical Systems Supporting Controlled Manufacturing
Meeting stringent space conditioning requirements demands mechanical systems designed for performance, not just ventilation.
Air is treated as a managed utility - introduced, conditioned, filtered, and distributed with defined performance characteristics. Filtration, in particular, is implemented as a layered system strategy. Prefiltration removes larger particulates and protects equipment, while higher-efficiency filters reduce finer contaminants within central systems.
In more sensitive environments, HEPA filtration is applied at the terminal level or within recirculation paths, targeting critical zones rather than the entire facility. In many cases, the goal is not to make the entire facility clean room certified, but to deliver the required level of control where the process demands it. Where filtration is applied - at intake, within recirculated air, or at specific process areas - is as important as the filter itself. This targeted approach helps balance air quality, system size, and energy use.
For ISO-classified environments, filtration alone is not sufficient. These spaces rely on a combination of high air change rates, controlled airflow patterns, and terminal filtration to maintain required conditions. At larger scales, this often requires zoned approaches that focus control where it is most critical.
Together, these strategies reflect a shift toward performance-driven environmental control, where systems are engineered to support process requirements rather than general space conditioning.
Looking Ahead
As controlled environments move beyond laboratories and into full-scale manufacturing, the challenge is no longer creating isolated clean spaces - it is maintaining consistent conditions across entire facilities.
If you are evaluating how your facility can support these demands - or planning upgrades to meet evolving process requirements - we’d love to hear about it! Contact me and let’s discuss your specific needs and options.
Categories: Industrial & Manufacturing
Tagged: Mechanical | Engineering