Archive: 2019

Cleanroom: A Quick Guide to Classifications, Design, and Standards

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Cleanrooms are integral to countless operations around the world. Scientists, manufacturers, and a bevy of other industry professionals rely on these rooms to mitigate the risk of contamination in products or processes. It’s important to understand the different cleanroom classifications and guidelines behind how these rooms are constructed and utilized to determine which is the best fit for your application.

We’ve outlined how cleanrooms are classified and designed below. The trained staff at Air Innovations will work with your cleanroom design and specifications to provide the optimal Environmental Control Unit (ECU) for your cleanroom.

Air innovations cleanroom air conditioning

Cleanrooms—All You Need to Know

Cleanrooms are man-made, controlled environments. These spaces are designed and built specifically for use in industries which rely on extreme cleanliness and predictability. Manufacturing and scientific research applications regularly utilize cleanrooms to perform daily tasks and help with specialized projects. Virtually any industry involving work that could be negatively impacted by small particles necessitates the use of cleanrooms.

A well-conditioned cleanroom offers researchers and other workers the opportunity to perform tasks in an environment with low levels of pollutants. That means that common problems like dust, chemical vapors, and airborne microbes can’t interfere with the work at hand.

Cleanroom classification Cleanroom - airbone microbes

Cleanroom Classifications

Cleanrooms are subject to a range of classifications based on their capabilities and intended applications. The functionality of the cleanroom and the quality of air it facilitates will largely determine the classification.

Cleanroom classifications measures how many particles of a certain size (over 0.5 mm) exist within one cubic foot of air inside the room. FED-STD-209E regulations classified cleanrooms based on the allowable particles contained within each cubic meter of air in conjunction with the size of said particles. These regulations are still referenced frequently when determining cleanroom requirements but have largely been replaced by the stricter International Standards Organization (ISO) classifications.

ISO 14644-1:2015 Cleanrooms and Associated Controlled Environments ranks cleanrooms in terms from function on a scale from 1–9. A cleanroom classified as ISO Class 1 exemplifies the highest possible cleanliness and air purity standards, while an ISO Class 9 would have the lowest requirements. The following table demonstrates the exacting requirements for each cleanroom classification:

ISO 14644-1: 2015 FED_STD-209E

Maximum Allowable Particles in One Cubic Meter of Air

Size of Particles

> 0.1 micron > 0.2 micron > 0.3 micron > 0.5 micron > 1 micron > 5 microns
Class 1 N/A 10 2 0 0 0 0
Class 2 N/A 100 24 10 4 0 0
Class 3 Class 1 1,000 237 102 35 8 0
Class 4 Class 10 10,000 2,370 1,020 352 83 0
Class 5 Class 100 100,000 23,700 10,200 3,520 832 29
Class 6 Class 1,000 1,000,000 237,000 102,000 35,200 8,320 293
Class 7 Class 10,000 N/A N/A N/A 352,000 83,200 2,930
Class 8 Class 100,000 N/A N/A N/A 3,520,000 832,000 29,300
Class 9 Standard room air N/A N/A N/A 35,200,000 8,320,000 293,000

Cleanroom Design

A cleanroom’s design will be directly influenced by its required ISO classification. The amount of square footage that an organization can set aside for their cleanroom impacts numerous components of the room—the clean zone, airlocks, and gowning room must all be considered carefully as well. The latter areas must be carefully designed to mitigate particle migration from the exterior into the cleanroom.

Methods for improving the cleanliness capabilities of a cleanroom include:

  • Adding airlocks
  • Improved filtration
  • Increasing the number of air changes per hour

Cleanroom: a quick guide to classifications, design, and standards

ECU semiconductor application

Cleanroom Services From Air Innovations

Since our founding in 1986, Air Innovations has operated by a commitment to continuous innovation and growth. As such, we are continually improving our capabilities and offerings. Our expert staff designs and manufactures HVAC systems for use in a variety of cleanroom applications and other critical environments.

Interested in learning more about cleanrooms? Download our “Cleanroom Technology” whitepaper. The whitepaper illustrates how temperature, humidity, filtration, and pressure can affect applications. We also have whitepapers available covering the pharmaceutical industry, the semiconductor industry, and our Micro Environments product line. These whitepapers can be found here. More information regarding our work with cleanrooms and other industries can be found on our case studies page.

For more information about our line of cleanroom solutionscontact our team today. We’re looking forward to talking to you!

HVAC – A Complete Guide on Specialized HVAC Systems

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Advancair® – custom clean room air conditioner

HVAC systems are essential components in the functionality and appeal of all modern buildings. Well-designed and efficient HVAC systems go well beyond ensuring comfortable temperatures and fresh air for facilities. They also play a key role in the production and testing processes of a broad spectrum of industries.

HVAC systems play a crucial role in pharmaceutical engineering and manufacturing because they have a direct impact on the production environment. Optimized HVAC units can help pharmaceutical companies Mining and Drilling, pass inspections, and remain CGMP-compliant, and more.

Specialized hvac systems infographic

All You Need to Know About Specialized HVAC Systems

What is a Specialized HVAC System?

The acronym HVAC stands for heating, ventilation, and air conditioning. Specialized HVAC systems control the temperature, humidity level, and air quality in a space to ensure the required specifications for your application are met.

Types of HVAC Systems We Design & Manufacture

We specialize in the design and manufacture of advanced HVAC systems for the precise control of temperature, humidity, filtration, and pressurization for equipment and processes. The three main configurations of HVAC systems we manufacture are integrated, mounted, and standalone in standard or custom solutions.

Integrated HVAC

Integrated solutions are designed to fit seamlessly within existing equipment structure, allowing for a smaller size and footprint, greater system efficiency, and lower installation cost.

Mounted HVAC

ECUs that are mounted to an existing system can be designed to meet system weight constraints, provide a reduced ECU footprint, and offer close proximity to the process.

Standalone HVAC

Standalone units can be placed in the space surrounding your equipment and offer maximum flexibility in system location, installation, configuration, and performance capability.

Explosion-Proof HVAC

Less common but no less critical, explosion-proof HVAC systems are an essential aspect of many industrial applications. For example, ore mining/processing facilities can make use of these units to prevent an explosion of coal dust particles in the air.

Other industries that utilize explosion-proof HVAC systems include:

  • Oil and gas
  • Military
  • Aerospace
  • Pharmaceuticals
  • Food processing
  • Agriculture

Nowadays, many off-the-shelf explosion-proof units are available. However, companies that require explosion-proof environmental control units often need to ensure that their HVAC systems supplier has the capability to provide a tailored solution for their particular application.


Industries and Applications

Industries ranging from homeland security to aerospace use specialized HVAC solutions as an essential part of their daily operations. The following are some examples of specific industries and applications that utilize HVAC systems.



Aerospace applications require strict environmental control in everything from research and development to launch areas. At Air Innovations, we’ve supported a variety of unique aerospace projects, such as clean room filtration, environmentally controlled transportation of aerospace components, and strict environmental control of launch areas.

For example, one rocket’s fueling system demanded a dry dew point of -22° C just before launch. Any remaining moisture would condense and transform into ice on the rocket’s piping, creating a dangerous situation. The solution to this quandary was an in-line desiccant dryer surrounded by two tailored environmental control units used to eliminate moisture and maintain tight temperature tolerances.

Homeland Security

Environmental control for homeland security systems     Homeland security hvac

Durable HVAC units assist in temperature and humidity maintenance at airport terminals, including security checkpoints and baggage claim areas. Additionally, explosives detection devices (EDDs) at airports demand strict internal control of temperature and humidity variables in order to function properly.As such, the Homeland Security Department relies on specialized HVAC units for these applications.

Mining and Drilling

Custom environmental control for mining & drilling     Oil & drilling application - ocean

Mining and drilling companies use environmental control units to keep electrical cabinets of centrifuge machines cool. Centrifuges eliminate slurry during drilling operations, and are therefore an indispensable component of the overall extraction process. ECUs that keep their cabinets cool help prevent overheating, fires, explosions, and other dangerous circumstances.

Life Sciences and Pharmaceutical

Life sciences and biotech environmental control systems     Explosion Proof HVAC for Pharmaceuticals

Biotech and pharmaceutical companies frequently employ specialized HVAC units for strict control over temperature, humidity, and dew point, especially when handling sensitive equipment, or performing processes that require certain environmental conditions to succeed.



Computer rooms, laboratories, hospitals, and process isolators often make use of cleanrooms. HVAC units designed for cleanroom use often come with features such as positive/negative pressure control, once-through or recirculating air flow, and alarms triggered by the slightest variance from set tolerances.


The Pharmaceutical Industry and HVAC Systems

Air innovations cleanroom air conditioning

The Importance of HVAC Systems for the Pharmaceutical Industry

Why are well-functioning HVAC systems so important to the pharmaceutical industry today? While there are many factors involved, but here are just two of the reasons they are so essential:

  • Modern diagnostic machines need to operate within very strict temperature and humidity tolerances so that the integrity of powdered and fluid reagents is not comprised. The consequences of a misdiagnosis or false reading from the introduction of unanticipated moisture, for example, could be serious for both patient and medical provider alike. Customized HVAC units that ensure stable environmental conditions—whether cold, hot, or dry—and integrate well into often limited space, are key pieces of an effective diagnostic process.
  • Moisture can be one of the worst enemies of modern medicine production. In every phase of production—from milling to compounding to coating—excess moisture can cause manufacturing inefficiencies, weaken the medicine’s effect, or in the worst-case scenario, completely ruin an entire batch of product. Specialized HVAC units that enforce a specified dew point based on the application all but guarantee that there will be no excess moisture from the air to cause production issues.


System Design

There are several design considerations that engineers must apply to HVAC systems intended for pharmaceutical applications. Ideally, architectural components should dovetail with HVAC design factors, such as pressure differential cascades and cross-contamination control. Adequate ventilation and filtration are important considerations for laboratory testing areas and cleanrooms.

Additionally, HVAC engineers must implement systems that ensure strict control over temperature, relative humidity and/or dew point, without interfering with the actual pharmaceutical manufacturing process.

Operational HVAC Optimization in Pharmaceutical Facilities

After HVAC room requirements have been established, there are ways to optimize HVAC system operations to keep costs low and efficiencies high. Some optimization measures could include:

  • The reduction of air-change rates
  • Optimized temperature and humidity limits
  • Improved control sequences for use of floating set-points and dead-band control
  • Changeover to a two-port variable volume system
  • The addition of airflow meters and air volume control components


Efficient and Custom HVAC Solutions at Air Innovations

Air Innovations provides several HVAC products specifically designed for use in the pharmaceutical industry. These include:

Hepair® cleanroom hvac system

HEPAir® Cleanroom HVAC System

Arrayair ECU

Arrayair ECU









Some Case Studies

Air Innovations has enjoyed much success in delivering highly specialized HVAC solutions to clients in the pharmaceutical industry.

For example, one customer requested a precision control HVAC system to provide uniform drying for fluid bed dryers used in capsule and pill coating. Air Innovations supplied a pharmaceutical process control unit that provided airflow to the process tools, allowed the client to add or remove humidity, and maintained a steady dew point of 50° F.

In another case, a client needed a chemical process control unit that would hold set temperature and humidity levels in widely varying conditions all over the globe, while also operating on a continuous, year-round basis. Air Innovations provided an HVAC unit that depends on two independent cooling coils, along with process fans that alternate operation time. Various sensor inputs help to manage switch-over intervals. As a result, the cooling coils continue running without defrost interruptions, even in sub-zero temperatures.

HVAC systems are an essential aspect of pharmaceutical manufacturing. If you’d like to learn more about how Air Innovations can provide a workable, highly-customized, and efficient HVAC solution for your manufacturing needs, reach out to us today.

Negative and Positive Pressure Rooms 101 | Hospital Infection Control


Hospital banner image

Effective positive and negative pressure rooms are an important part of industrial climate control systems. In medical settings, these rooms prevent the spread of infectious contaminants and maintain sterile or restricted spaces and are also referred to as Protective Environments (positive pressure rooms) and Airborne Infection Isolation Rooms (AIIR) (negative pressure rooms). Negative or positive pressure rooms are a necessary part of a wide range of medical and research environments, as they help maintain clean conditions in the smallest clinic to the largest hospital.

Understanding Positive and Negative Pressure Rooms

Positive pressure rooms maintain a higher pressure inside the treated area than that of the surrounding environment. This means air can leave the room without circulating back in. In this way, any airborne particle that originates in the room will be filtered out. Germs, particles, and other potential contaminants in the surrounding environment will not enter the room. In medical settings, a positive pressure room (protective environment) allows staff to keep vulnerable patients safe from infections and disease.

In contrast, a negative pressure room uses lower air pressure to allow outside air into the segregated environment. This traps and keeps potentially harmful particles within the negative pressure room by preventing internal air from leaving the space. Negative pressure rooms in medical facilities isolate patients with infectious conditions (AIIR) and protect people outside the room from exposure.

IsolationAir infographic

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Positive and negative pressure rooms both require a number of additional components to remain effective: Building positive and negative pressure rooms requires the use of specialized construction and climate control equipment. A minimum of 12 air-flow changes each hour must be maintained in order to sustain the desired environment and depending on the size and purpose of the room, more may be necessary.

  • Recirculation of air through HEPA filters to control the movement of airborne contaminants
  • Self-closing entryway with an adequate seal
  • Thoroughly sealed floors, ceiling, walls, and windows
  • Fans and ductwork to move air in the desired directions
  • A monitoring system that allows users to adjust pressure when necessary
  • Intermediate environment between the pressure room and outside environment for deliveries, observations, and protective gear storage

Some medical facilities additionally incorporate UV radiation into the system to help maintain a sterile environment. Using UV light in a filtration system sterilizes particles and reduces viruses (such as coronavirus) in the quarantine space, helping to protect healthcare workers who enter the room to service the quarantined patient.

Negative and positive pressure rooms in hospitals

Positive and Negative Pressure Rooms in Hospitals

Positive and negative pressure rooms are an essential part of controlling the spread of infectious diseases within large facilities such as hospitals. Negative pressure rooms (airborne infection isolation rooms) are a common solution in infection control efforts. Hospitals use them in inpatient rooms to ensure infectious germs don’t spread throughout the facility via the HVAC system. Hospitals usually design the following areas as negative pressure environments:

  • Waiting areas, especially in emergency rooms
  • Triage areas
  • Bathrooms
  • AII (airborne infection isolation) rooms
  • Autopsy and dark rooms
  • Soiled laundry areas
  • Decontamination spaces

Positive pressure rooms are usually used in scenarios that must continually filter harmful contaminants out of the environment. This makes them helpful when treating patients with compromised immune systems because the introduction of any harmful element will be efficiently filtered out. They’re also used in situations that must continually maintain a specific type of atmosphere in a room, such as human and animal nurseries. Other uses of positive pressure rooms include in vitro fertilization labs and operating theaters.


Installing Your Pressurized Room

Hospital managers must carefully plan their pressurized room to ensure they satisfy the following requirements:

  • The room fits the facility’s needs and space
  • The room conforms to applicable legal regulations
  • The room fully protects patients and the general public from the spread of infectious diseases

Efficiently installed positive and negative pressure rooms mean the difference between a healthy environment for hospital patients and one compromised by infectious pathogens.

Beyond the basics

Discover All That Air Innovations Has to Offer

Air Innovations creates custom positive and negative pressure environments for various medical and specialized facilities. From full custom quarantine ECUs to sterile storage solutions we provide a range of products and services that help hospitals maintain healthy indoor environments. Contact us to learn more about contamination control and sterilization solutions or for a customized quote for your next cleanroom project.   Download our IsolationAir-brochure for more details about our line of standard hospital contamination control systems.

Specialized Dew Point and Humidity Control Systems: All You Need to Know

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Dew point and humidity are important environmental factors in industrial settings. Although both these terms describe the amount of moisture present in an environment, some crucial differences exist between them.

Understanding the differences between an environment’s dew point and humidity is essential for selecting an optimal humidification or dehumidification system for your business or facility. Knowing the amount of moisture present in your internal climate as well as the point at which it condenses will allow you to better control the systems that govern these factors.

Specialized dew point

Understanding Humidity and Dew Point Control—Why Is It Needed?

Humidity measures the amount of water vapor present in the air. Absolute humidity defines how much water the surrounding air holds, and relative humidity is the percentage of air that contains liquid vapor at the time point of measurement. Specific humidity expresses the relationship between moist and dry air in a single system.

An environment’s dew point is the temperature needed for water vapor to condense and form on surfaces. A higher dew point means a higher atmospheric temperature at which dew forms.

Another way to describe an area’s dew point is the point at which its air reaches 100% relative humidity. At this point, the air has absorbed the maximum amount of moisture that it can retain and introducing any further moisture to the system results in fog or precipitation. This also occurs when the temperature is reduced in an environment that has 100% relative humidity.

Aerospace - orbital antares rocket launch Industries

A wide variety of industries rely on controlling the relative humidity and dew points to maintain good product quality and optimal working conditions:

  • Food distribution centers use humidity control systems to increase shelf life and avoid exorbitant energy prices
  • Humidity control prevents the spread of pathogens in medical facilities
  • Production facilities that work with hazardous chemicals control air moisture content to reduce the risk of volatile chemical reactions
  • Storage facilities use humidity control systems to keep porous or delicate materials from spoiling

Finding the correct moisture content for a room also increases its comfort for people. Commercial and industrial operations use humidity control systems to maintain comfortable internal environments without incurring large energy bill fluctuations.

Humidity Control Solutions for Multiple Industries

Controlled environment in medical analysis equipmentEnvironmental control companies must constantly innovate to create humidity control systems optimized for specific industrial environments. To use a specific example, biotherapy reagent packaging plants require systems that successfully balance high evaporative loads and heat. Designers of humidity controls for these kinds of facilities must customize clean rooms to consistently maintain high safety and health standards.

In another example, aerospace OEMs require large industrial cooling systems to maintain good manufacturing environments for delicate technological systems. Humidification control systems must meet narrow temperature, dew point, and humidity requirements to prevent corrosion or damage to sensitive electronic equipment.

Semiconductor manufacturers also rely on effective humidity control systems for this reason. Climate control systems for these facilities must achieve critical tolerances for humidity and temperature in both near-saturation environments and dry or trace-moisture facilities. Additionally, it is especially essential that if an application is using outside air, limited humidity fluctuation rates are considered for the process.

Control Moisture Buildup with Air Innovations

Humidity control in industrial environments improves product quality, industrial compliance, and employee, customer, and patron safety. Air Innovations designs a full suite of humidification control systems for settings that range from industrial clean rooms, HVAC systems, and factory floors.

If you would like to learn more about how we can help control the moisture content of your facility or business, be sure to contact us today.

If you would like to see case studies, view our general case studies page. We also have whitepapers available covering multiple industries including the the aerospace industry, the semiconductor industry, the pharmaceutical industry, and our Micro Environments product line.