Vented Balance and Fume Hood Array


Finding a product capable of containing a process where powdered product is converted into an aqueous solution can be tricky. Especially if such processes evolve toxic vapors and gases. In these scenarios, weighing with an analytical balance is typically followed by adding the powder to a stirred liquid. At this point, vapors and gases may evolve.

In this case study, Flow Sciences worked with a customer to develop a two-section containment system that optimized containment while maximizing process efficiency. Such designs become even more essential when high potency active pharmaceutical ingredients are involved.

The device depicted in Figure 1 is an example of the custom product FSI produced for such an application.


Our customer had a limited space to perform stirring, weighing, and calibrated solid-liquid mixing operations. Flow Sciences was made aware of chemicals and quantities used in this process.


Flow Sciences proposed joining an open-face powder enclosure with a bag-in bag-out filter and fan (thimble connection to building exhaust) with a polypropylene vertical sash fume hood exhausted to the building exterior.

This arrangement became more defined with multiple phone calls and emails until all parties agreed to the process array depicted below:

Key materials of construction were stainless steel, polypropylene, and anodized aluminum. A deep stainless work space in the fume hood section had hinged doors for final product access and removal.

Successful ASHRAE 110-2016 testing (4 Different Sash positions) completed prior to Product Shipment:


Flow Sciences worked with our customer and devised a unit containing both a HEPA-filtered weighing enclosure and a polypropylene fume hood. A sliding connecting pass-through was also constructed. The weighing enclosure contained the weighing process with HEPA filtration and the fume hood contained the stir plate solvent addition operation. This construction permitted containment of both liquid and powdered substances in two different processes. Process flow was maximized with this design scheme. The weighed powder could be moved from the HEPA balance section to the fume hood through the sliding door, where solvent mixing took place.

All this was done with demonstrated containment in our test room using ANSI / ASHRAE 110-2016.

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Contact: Flow Sciences, Inc.

Tel: (800) 849-3429

Fax: (910) 763-1220





Flow Sciences’ Hybrid Isolator Contains to Less Than 50 ng/mwith Bulk Powders 

LELAND, NC, June 26, 2018 — Flow Sciences, a leading provider of containment systems for laboratory, pilot plant, and manufacturing facilities, now offers a Bulk Powder Hybrid Isolator glovebox that is proven by third-party acceptance testing to facilitate an interior concentration of less than 50 nanograms per cubic meter (50 ng/m3).


The system maintains all of the engineering controls of the standard Hybrid Isolator, but is now designed to include a 20” cutout and a membrane set which can accommodate 3 bulk powder drum diameter sizes. The membrane set also prevents powder from spilling over the lip of the drum during pouring operations. In addition, it can be shipped with a hydraulic lifting jack which allows the customer to lift a drum through the base of the enclosure into its interior to work with the bulk powders in a contained environment.

Flow Sciences’ consultation process breeds innovative solutions, which drives the evolution of our standard products. This adaption of our Hybrid Isolator Series is a perfect example of who we are as a company. Every interaction with end users and engineers adds to our growing enclosure repertoire, which continues our corporate vision of providing the best containment solution for numerous applications. Using our TaskMatch application search tool, we combine today’s consumer-oriented market with our own expert consultation to create a product of optimal performance.

In the constantly connected landscape of today, the ever increasing toxicity of active pharmaceutical ingredients (APIs) presents the ever increasing need for personnel and/or product protection. At Flow Sciences, we consistently strive to ensure the safety of the whole process by engineering and manufacturing optimal enclosure. Flow Sciences creates engineering controls for hazards that cannot be eliminated or substituted.


For a PDF of this Press Release or for questions or comments, please contact us below:


About Flow Sciences, Inc.

Flow Sciences is the world’s leading developer of containment solutions for research and development laboratories, pilot plants, automation equipment and robotics, manufacturing and production facilities where toxic or noxious potent powders, fluids, or gases require safe handling while weighing, mixing, processing, or manufacturing. Since its start in the 1980s and with the introduction of the Vented Balance Safety Enclosure (VBSE™) in the 1990s, Flow Sciences has gone on to develop a comprehensive line of over 500 enclosures, including industry standards like the Vented Balance Safety Enclosure (VBSE™), the Contained Vented Bulk Powder Enclosure, and innovative laboratory technologies like the FS1501 Nitrogen Controller and the Bag-In/Bag-Out HEPA Filtration System. For its accomplishments, Flow Sciences received an Expert Achievement Award from the U.S. Department of Commerce for accomplishments in the global marketplace, the Deloitte and Touche North Carolina Technology Fast 50 Award, the UIBS R&D and Technology Collaboration Award, along with many others. During the 1990s, Flow Sciences pioneered the Vented Balance Safety Enclosure Series (VBSE™) which introduced the first independent fan exhaust system to isolate vibrations for balance accuracy, swiftly becoming the world leader in laboratory safety equipment. Flow Sciences technologies are now used to improve safety and containment in virtually every industrial sector around the globe, from pharmaceutical, food processing, robotics, chemical, forensics, agriculture, academia, infectious diseases, asbestos, tires, biotechnology, batteries, and nanotechnology. Flow Sciences has over 30 years of expertise in the development of containment solutions that deliver superior engineering quality and service at each level of controlled airflow containment systems. Flow Sciences offers the incorporation of Computational Fluid Dynamics (CFD), further refining the process of presenting personnel and product protection through framed enclosure solutions. The company’s Flow Sciences China division serves as a market leader in mainland China, spearheading the development of solutions throughout Asia. Under its Flow Sciences brand, Flow Sciences offers the best in laboratory containment, and is committed to finding containment solutions that meet your needs.


All other product names and trademarks are the property of their respective owners, which are in no way associated or affiliated with Flow Sciences.


Headquarters: Leland, NC USA:

Flow Sciences, Inc., 2025 Mercantile Drive, Leland, NC 37912;

Tel: 1-800-849-3429, Fax: 1-910-763-1220, Email:,