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Lifetime Assurance for Lifetime Products

Our mission is centered on empowering you with exceptional service and comprehensive solutions, ensuring that your Flow Sciences containment systems function optimally with the least amount of downtime. We are devoted to offering you intuitive, accessible, and expert support. Our dedication to being responsive, knowledgeable, and providing personalized assistance forms the core of our commitment—to enhance your user experience and maintain the integrity of every product you trust us with.

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Certification Guidelines & Standard Manuals

Product Info

Standard Dimensions & Airflow Requirements


Top Mount Enclosure - ETA Series


Hybrid Isolator -
EHA Series


Hybrid Isolator -
EHG Series


Hybrid Isolator -
EHP Series


Glovebox Workstation - EGP/A Series

Nitrogenema II_a

Nitrogenema II -
ENP/D Series


Analytical Isolator - ECP/G Series

EVA361919 2

Vented Balance Enclosure - EVA Series

Frequently Asked Questions (FAQs)

What is the purpose of the face velocity alarms that are sent with each enclosure?

The face velocity alarm is a critical safety feature included with each containment enclosure to monitor proper airflow within the enclosure. The purpose of the face velocity alarm is to alert you when the air velocity (face velocity) inside the enclosure has fallen below the recommended and safe operating range. When working with hazardous materials or substances inside a containment enclosure, it’s essential to maintain a consistent and controlled airflow. The face velocity alarm measures the speed of the air as it passes through the front opening of the enclosure, which is where the operator interacts with the enclosure’s workspace.
The key functions of the face velocity alarm are:

    1. Safety Monitoring: The alarm continuously monitors the face velocity, and if it falls below the safe operating range, it will provide an alert. A sudden drop in face velocity could indicate a problem with the ventilation system, such as a filter blockage or fan malfunction, potentially exposing the operator to hazardous materials.
    2. Operator Protection: Maintaining the recommended face velocity helps to contain any airborne contaminants or hazardous particles generated during handling within the enclosure. This protects the operator and surrounding environment from potential exposure.
    3. Compliance with Regulations: Many regulatory guidelines, including USP 800 and other industry standards, specify the minimum required face velocity for containment enclosures. The face velocity alarm assists in complying with these safety regulations.
    4. Performance Verification: The alarm helps validate that the containment system is functioning properly and operating as designed. Regular monitoring of face velocity also ensures that the containment unit is providing an effective barrier against hazardous materials.

In summary, the face velocity alarm is a critical safety tool that helps maintain a controlled environment within containment enclosures, providing an added layer of protection for operators and maintaining compliance with safety regulations. It serves as an early warning system for potential issues, ensuring safe and effective containment of hazardous materials during various laboratory and industrial applications.

Why is the face velocity alarm sounding all the time? For your safety and the proper functioning of the alarm, please refrain from unplugging it. If you encounter any issues with the alarm, a common cause might be that it has not been calibrated yet. Our dedicated team is ready to assist you promptly. Common issues may be addressed using the TROUBLESHOOTING GUIDE.  Alternatively, feel free to reach out to us at 1-800-849-3429, and we’ll be more than happy to provide the necessary support and guidance to ensure your alarm operates optimally. Your safety is our priority, and we’re here to address any concerns you may have regarding the alarm’s performance.

How do you calibrate an alarm? For detailed instructions, refer to the user manual that shipped with the enclosure or alarm, or in the Certification Guidelines. To request a copy of the user manuals, click here. 

What type of filter do I need? Selecting the appropriate filter for your enclosure depends on your specific application. While most applications utilize HEPA filters, there are instances where carbon or ULPA filters may be required. At Flow Sciences, we understand the importance of finding the right filter for your needs. For personalized assistance and expert advice regarding your enclosure, please reach out to us. Our dedicated team is here to provide the technical knowledge and support you require. Contact Flow Sciences today, and let us help you choose the perfect filter to ensure optimal performance and safety for your application.

When do you change a HEPA filter for a top-mount BIBO enclosure with a minihelic gauge? It depends!! We have a whole host of reasons why a filter should be replaced, but since you’re specifically asking about the minihelic gauge, we presume you’re looking for an answer based on this criteria.  Upon the initial setup and certification of your enclosure, with the face velocity set to your specifications, record the value that is being displayed on your gauge. As the filter performs its function, and with frequent certification ensuring that the face velocity matches the initial setup value, the pressure reading will gradually increase. When the pressure reading is double the initial value, it’s time to change the filter. If you have any questions or need further guidance, please don’t hesitate to contact us, and we’ll be happy to assist you.

How do you determine what filter(s) you need for your top-mount fan housing system? To determine what filter(s) your enclosure requires, we will need the serial number from your enclosure.

Why isn’t my fan running? We assume that it’s plugged in and turned on? With those two criteria fulfilled, let’s look at other likely causes.  Please check the fuse that is near the power connection.  Beyond that, if you encounter any issues with the fan not working, we recommend referring to your manual for troubleshooting steps. Alternatively, you can reach out to your dedicated Flow Sciences representative for assistance. We are here to provide the technical knowledge and support you need to address any concerns with your enclosure’s fan functionality.

Why isn’t my fan pulling enough air? There are various reasons that this could be happening.  Please see the TROUBLESHOOTING GUIDE for common causes and solutions. If you still experience any challenges or suspect that your enclosure is not performing as expected, our dedicated team is here to help. Contact Flow Sciences for personalized assistance and expert guidance tailored to your specific enclosure. We possess the technical knowledge and expertise to address your concerns effectively. Reach out to us today for further assistance and let us ensure that your Flow Sciences enclosure operates at its best.

Can my enclosure be repaired? We understand that accidents happen and parts of enclosures may become damaged. The good news is that many broken parts can be repaired. At Flow Sciences, we have a dedicated team ready to assist you in assessing the repairability of your enclosure. Simply reach out to us with the details of the damage, and our knowledgeable staff will guide you through the process. We are committed to providing exceptional customer service and technical expertise to help you determine the best course of action for your enclosure. Trust Flow Sciences to help you explore repair options and ensure your enclosure is back in optimal condition. 

Can we replace our armrest on the front of the hood? Technically it’s not an armrest, but we know what you’re talking about. Each enclosure is equipped with a base airfoil, designed to optimize airflow and improve performance. It’s essential to use the airfoil as intended, not as an armrest. In the rare event of a base airfoil breaking, we offer a reliable solution—an anodized aluminum retrofit kit to replace the broken component. To assist you effectively, please provide us with the enclosure model, serial number, and details about the alarm you are currently using (FS1645 or FS1650). This information will enable us to promptly address your needs and ensure the appropriate retrofit kit is provided. ArmRest assured, our team is here to provide knowledgeable support and help you find the best solution for your enclosure.

Does Flow Sciences sell retrofit kits? Flow Sciences offers customized engineering and manufacturing solutions to update or modify your containment system based on your specific application requirements. Our team of experts is well-equipped to assist you in finding the most suitable solution. For further details and personalized assistance, please get in touch with your dedicated Regional Sales Manager (RSM). They are ready to provide you with the technical knowledge and support needed to ensure your containment system meets your unique needs effectively. Don’t hesitate to reach out to us for any questions or inquiries you may have.

Does Flow Sciences sell replacement balance enclosure fans? Certainly! We offer replacement fans and parts for all our containment systems. For a hassle-free experience, please CONTACT US. Our team of experts is committed to providing professional support and ensuring that you have access to the right components for your containment system. We are here to provide knowledgeable guidance and help you maintain the optimal performance of your Flow Sciences containment system.

Do you have a distributor in my area (country)? Quite possibly, and we’re always increasing our service area. Fill in and submit the form linked here: and someone will contact you with the channel partner in your area. These partners are our ‘Boots on the ground’ in your area and are entrusted to assist you with sales, service, and repairs of your Flow Sciences equipment.

Where can I find certifiers for our enclosures? We understand the importance of certification for your containment solutions. To assist you in finding certifiers in your area, use the FIND A CERTIFIER tool on the main Technical Support page.  Alternatively, you can contact us directly and our knowledgeable team can provide you with a list of reputable certifiers who can assess and validate the performance and safety of our enclosures. We are dedicated to ensuring that your containment solutions meet the necessary regulatory standards and certifications. Reach out to us today and let us guide you to the certified professionals in your region. We are here to support you with our technical expertise and commitment to customer service.

Why didn’t my enclosure pass inspection? Please ensure that you have already contacted your certifier for any certification-related inquiries or concerns. Their expertise and guidance are crucial in ensuring that your containment system meets all necessary standards and requirements. If you have not yet reached out to your certifier, we recommend doing so promptly to address any certification matters and ensure compliance with applicable regulations. If you need assistance in finding a certifier or have any other questions, our team is here to help. Feel free to get in touch with us, and we’ll be glad to provide further support and information.

Does Flow Sciences install enclosures? Our enclosures come with comprehensive installation manuals that provide clear and straightforward instructions. Assembling our enclosures is a straightforward process, and we are dedicated to assisting you every step of the way. If you have any questions or need guidance during installation, our team is readily available to help. At Flow Sciences, we prioritize customer satisfaction and aim to ensure your experience with our products is seamless and successful. Feel free to reach out to us with any queries or concerns – we are always here to provide the support and knowledge you need. Your satisfaction is our top priority.

What is the optimal airflow for your enclosure? It depends!! The recommended airflow for optimal performance is based on the style of enclosure that you have. Please refer to the user manual that shipped with your enclosure for specific details. (If you no longer have that, you can request a copy here). Alternatively, this information is provided in the Certification Guidelines.  Should you have any further questions or need assistance with your specific enclosure, don’t hesitate to contact us. Our team of experts is here to support you and ensure your experience with our products is exceptional.

Does Flow Sciences have testing data to support containment claims? Absolutely. Beyond the normal regulatory testing for our enclosures, we have conducted surrogate powder testing on a wide range of our products, and the data is available upon request. However, it’s important to note that all testing is conducted based on the specific style of hood and the application requirements. This ensures that the testing results accurately reflect the performance and containment capabilities of the specific needs of that process. Rest assured, we are committed to providing you with accurate and reliable data to help you make informed decisions about our containment solutions. Please don’t hesitate to reach out for further information.

What level of containment is achieved with open-face enclosures? It depends!!  Containment requirements and capability vary based on several factors such as the quantity of the substance being used, the frequency of use, and the characteristics of the material handled. Our enclosures are designed to meet these diverse needs, with many achieving containment levels below 1 µg/m³. For detailed surrogate powder testing results and performance information, we invite you to visit our performance page at This page provides valuable insights into the exceptional containment capabilities of our enclosures. Trust Flow Sciences Inc to deliver the highest level of containment for your specific requirements. 

Does Flow Sciences have available sample test reports for the enclosures? Certainly! We provide surrogate powder, ASHRAE, and other test reports and protocols upon request. All testing processes are thoroughly documented and securely stored at Flow Sciences for proprietary purposes. For sanitized test reports and detailed information, please don’t hesitate to reach out to Flow Sciences. Our team is here to assist you with any technical inquiries and ensure you have the necessary information to make informed decisions. Feel free to contact us for any further assistance you may require.

What is the value of Flow Sciences’ products? At Flow Sciences Inc, we take pride in offering industry-leading containment solutions. Our products are meticulously designed to deliver unmatched performance and durability, meeting the highest standards in the industry. We understand the importance of considering the life cost of a product, and we are pleased to inform you that our products not only excel in quality but also provide excellent value. In fact, our products are competitively priced and have a lower lifetime cost compared to our competitors. For more information about our exceptional products, please visit our website at Discover the Flow Sciences Inc advantage and explore the range of quality solutions we offer at

Can I get a product faster than normal shipping? Yes, we understand the importance of receiving your containment solution promptly. To expedite the delivery process, we offer an option to reduce the lead time. This ensures that your containment solution is prioritized and delivered to you sooner. We value your time and aim to provide efficient service while maintaining our commitment to quality. Contact our customer service team to discuss expedited delivery options for your specific order. We are here to assist you in receiving your containment solution promptly and meeting your project deadlines.

Is there helpful information I should know before using my Flow Sciences Enclosure? Absolutely.  Although likely thrown away by now, the user manual for your enclosure has a lot of useful information.  Please use the REQUEST FORM for a replacement manual.  Additionally, the Certification Guidelines and manual are helpful tools to further understand your Flow Sciences enclosure.

Where can I find information regarding shipping options? At Flow Sciences Inc, we provide shipping options worldwide to ensure that our products reach customers globally. However, shipping terms and arrangements are determined on a case-by-case basis. To discuss the shipping options available for your specific location and requirements, we encourage you to contact your dedicated Flow Sciences representative. Our customer service team is well-versed in international shipping logistics and can provide you with the necessary information and assistance. We are committed to delivering exceptional customer service and technical knowledge, ensuring a smooth shipping experience tailored to your needs. Get in touch with us today to explore the shipping options for your Flow Sciences products.

 Where do I find a manual for my enclosure? You can use the manual REQUEST FORM , email us at [email protected] or you may call us at 1-800-849-3429 to request a copy. 

 If I place an order today, what is the lead time for any system (standard or custom)? It depends!! The design and complexity of the enclosure that you’re purchasing dictate the time to delivery.  Simpler designs ship out faster than complex ones. Also, standard products are generally faster than custom designs. Regardless of the type, typically during the 4th quarter, our busy season, lead times may be extended. Most importantly, our commitment is to deliver your enclosure as promptly as possible while ensuring it passes our rigorous Factory Acceptance Testing.

Do you offer web conference training? Yes, we offer web conference training through all communication platforms. Contact us to set up a time and we’d be happy to speak with you and your team.

What warranty do you offer on your enclosures?At Flow Sciences Inc, we prioritize customer satisfaction and offer a comprehensive warranty. Products are guaranteed against defects in materials or workmanship for 90 days after receipt, and mechanical/electrical components are guaranteed for one year. Proper usage as instructed is necessary for warranty coverage, while damage from shipment or non-recommended chemicals is not covered. Unauthorized alteration of the product invalidates the warranty. Register your warranty at for dedicated customer service and technical support. We are committed to delivering exceptional service and prompt assistance throughout the warranty period. Contact our customer service team for further inquiries. Experience peace of mind with Flow Sciences Inc’s reliable warranty coverage and support.

 Can I fill out the warranty online? Certainly! To register your product and activate your warranty, simply visit for dedicated customer service and technical support. Registering your warranty will ensure that you receive the full benefits of our coverage and dedicated customer service. Thank you for choosing Flow Sciences, and please don’t hesitate to contact us if you have any questions or need further assistance.

 Can we come and visit your facility? Absolutely, we warmly welcome our valued clients and esteemed distributors to visit us and meet the Flow Sciences team in person. Our facility is open and ready to host you, providing the opportunity to see our manufacturing processes and witness the quality and precision that goes into each containment system we produce. It would be our pleasure to give you an immersive experience, answer any questions, and discuss your specific needs and requirements. If you’re interested in scheduling a visit, please reach out to us, and we’ll be delighted to make arrangements for your visit.

Where is the serial number located on the enclosure? The enclosure serial number can be found on the left outside wall, near the back lower corner, close to the black base. It is important to provide the enclosure serial number specifically, as the fan housing or filter serial number does not offer the same level of information. By providing the correct enclosure serial number, we can accurately access all the relevant details about your unit, such as its date of manufacture and original order. This ensures that any support or service we offer aligns perfectly with your specific containment system. If you need any assistance or have further inquiries, feel free to reach out, and our team will be delighted to assist you.

What information does the serial number for an enclosure provide? The serial number of the unit provides valuable information about its date of manufacture and the original order. Knowing the production date allows us to access the specific revision of the engineering drawing that was in effect during that time. This detail is crucial, as there may have been slight design improvements or modifications made over time to enhance the product’s performance. By referencing the correct revision, we ensure that any support or service we provide aligns perfectly with your specific unit. Our commitment to precision and quality ensures that your containment system operates at its best. If you have any questions or need assistance with your unit, feel free to reach out, and we’ll be more than happy to assist you.

Does Flow Sciences do custom work? Does a bear…? Yes, yes we do.  We offer the flexibility to work directly with clients or through our distribution partners. Our discovery, design and engineering team are capable of customizing enclosures to precisely match your unique application, equipment, and process requirements. By tailoring the enclosure to your specific needs, we ensure optimal performance and safety for your workspace. To learn more about our customization process and how we can meet your specific needs, please contact us for more information. We look forward to assisting you in finding the perfect solution for your application.

Does Flow Sciences sell fume hoods? Indeed, we offer a wide range of standard fume hoods, including both bench-mounted and floor-mounted options, to cater to various needs. Additionally, our expertise extends to custom fume hoods tailored precisely to your specifications, such as perchloric or all stainless-steel design fume hoods. Our commitment to providing versatile solutions ensures that your specific requirements are met with top-notch quality and functionality. Whether you choose from our standard product line or opt for a custom solution, rest assured that our fume hoods are designed and manufactured with utmost expertise to deliver optimal performance and safety. Feel free to explore our offerings and contact us for any custom requirements you may have.

Does Flow Sciences provide Fabrication services? Indeed, Flow Sciences offers comprehensive fabrication and contract manufacturing services. We specialize in custom manufacturing projects tailored to meet your specific requirements. For any custom manufacturing inquiries or projects, feel free to reach out to us via email at [email protected]. Our skilled team is eager to assist you in bringing your unique ideas to life with our technical expertise and top-notch fabrication capabilities. We are committed to providing you with the highest level of service and delivering outstanding results for your custom manufacturing needs. Don’t hesitate to contact us with your inquiries or to discuss your project in detail.

Where can I find electrical requirements for the enclosure I’m interested in? The electrical requirements for each standard and custom enclosure are available in the details section of their respective drawing packages. If you require specific electrical information tailored to your application, please get in touch with Flow Sciences, and we will provide you with the appropriate drawing package. Our team is here to assist you with any technical information or support you may need. Feel free to reach out to us for further assistance.

What is the specification on gloveboxes for humidity? Not all gloveboxes are equipped to control humidity levels. At Flow Sciences, we take pride in manufacturing products that are specifically designed to regulate humidity and oxygen levels within the containment area. Our Nitrogenema IITM and DrysolatorTM enclosures are designed for low humidity and/or oxygen applications. If you have any further inquiries or require technical details, feel free to contact us. We are here to offer professional knowledge and support for all your containment needs.

Can you convert a ducted safety cabinet into a ductless safety cabinet? Absolutely! The possibility of modifying your enclosure hinges on the filtration and airflow requirements needed to uphold the recommended face velocity for effective containment. For detailed information on how to proceed with the modification process, we recommend reaching out to Flow Sciences. Our team of experts will carefully assess your specific needs and provide tailored solutions to ensure optimal performance from your enclosure. Don’t hesitate to contact us for further details and expert assistance with modifying your containment setup. We’re here to help!

Can I schedule a conference call with Flow Sciences to discuss our process and possible solutions? Certainly! We encourage you to get in touch with us through either a phone call or by filling out our online contact form at Once we receive your inquiry, one of our knowledgeable representatives will promptly reach out to assist you. At Flow Sciences, we take pride in offering top-notch customer service and technical support. Whatever your query or requirement may be, we are here to provide expert guidance and ensure a seamless experience with our containment solutions. Feel free to reach out to us, and we’ll be more than happy to help!

 What materials of construction does Flow Sciences have available? Through built to order engineering and manufacturing, Flow Sciences will use the proper materials for your application. These materials can include steel, plastic, glass, and other materials necessary to contain your applications.

Which materials best suit which applications? The choice of materials for our enclosures is carefully considered based on the specific application and the substances they will contain or protect. At Flow Sciences, we take great pride in recommending task-specific enclosures that offer the utmost effectiveness. Our recommendations are founded on the information provided by our customers and the nature of the materials used within the enclosure. To ensure the best fit for your needs, please reach out to Flow Sciences with the relevant details. Our team of experts is ready to assist you in selecting the ideal materials for your containment requirements.

What is the USP 800 and how can I meet their requirements? USP 800 (United States Pharmacopeia Chapter 800) is a set of guidelines and standards developed by the United States Pharmacopeial Convention (USP) to ensure safe handling of hazardous drugs in healthcare settings. It specifically focuses on the handling, compounding, administration, and disposal of hazardous drugs to protect both healthcare workers and patients. To meet the requirements of USP 800, facilities and pharmacies need to implement certain practices and controls. Here are some key steps to meet the USP 800 requirements:

  1. Hazardous Drug Assessment: Identify and categorize hazardous drugs based on the NIOSH list. This helps to determine the level of containment required during handling and compounding.
  2. Containment and Engineering Controls: Use appropriate containment enclosures such as ventilated balance enclosures, biosafety cabinets, and fume hoods to prevent the release of hazardous drug particles into the environment.
  3. Personal Protective Equipment (PPE): Provide and enforce the use of appropriate PPE for all staff handling hazardous drugs, including gloves, gowns, masks, and eye protection.
  4. Training and Education: Ensure that all personnel involved in handling hazardous drugs receive comprehensive training on proper procedures and safety protocols.
  5. Environmental Monitoring: Regularly monitor and verify the performance of containment devices and ensure they meet the required air changes and airflow velocity.
  6. Cleaning and Decontamination: Establish cleaning and decontamination procedures for equipment, surfaces, and spill management.
  7. Storage and Transportation: Properly store hazardous drugs and follow guidelines for safe transportation within the facility.
  8. Waste Management: Implement appropriate procedures for the segregation, containment, and disposal of hazardous drug waste.
  9. Standard Operating Procedures (SOPs): Develop and follow detailed SOPs for all aspects of hazardous drug handling, from receiving to disposal.
  10. Quality Assurance and Compliance: Regularly assess compliance with USP 800 requirements and conduct internal audits to ensure safe handling practices are consistently followed.

It’s important to note that adherence to USP 800 guidelines is essential for the safety of healthcare workers and patients and to maintain compliance with regulatory bodies such as the US Food and Drug Administration (FDA). Consulting with a reputable containment equipment provider like Flow Sciences can be instrumental in meeting USP 800 requirements and ensuring the highest level of safety and efficiency in handling hazardous drugs.

Can I convert my current hood to one that would meet USP 800 for hazardous? Quite possibly, yes. The conversion options depend on the specific model number and serial number of the enclosure. If you have a 2000 series EVA with a remote blower, the conversion will be based on the configuration. Once we verify the model and serial number, we can proceed with either providing a conversion kit to transform a single HEPA unit into a dual HEPA unit, or the alternative would be to connect to house exhaust. Additionally, there’s the option to purchase a new fan housing that comes with a dual HEPA filter.

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