Customizable curtained enclosures and walk-in fume hoods

Manufacturing plants and factories utilize large machinery and tools to create finished goods. Oftentimes processes such as welding, cutting, grinding, purging, and cleaning create plumes of dust and fume that enter the surrounding work area and accumulate on surfaces.

An accumulation of dust and mist can not only create slipping hazards, but respiratory hazards as well, and can even wreak havoc on other machinery and computerized equipment in the shop. Additionally, particulate generated from one workstation can find its way onto surrounding work benches; which may be of a nuisance to fellow workers.

It is best to house these machines and work processes in separate areas in order to better protect both the workers and the product being manufactured. Unfortunately, facility and shop managers are faced with budget constraints and space limitations. The process of relocating oversized machinery is an expensive endeavor due to machine downtime and labor costs.

Understanding these issues, Sentry Air Systems developed a line of customizable, modular walk-in fume hoods and curtained machine enclosures that are economical, easy to install, and require no machine relocation.

Machine Enclosure Hoods

DSC_5718Sentry Air Systems Machine Enclosure Hoods allow facilities to house their oversized machinery within a curtained, air-filtered enclosure without the use of ductwork or permanent structures.

Knowing that no two machines are alike, Sentry Air Machine Enclosure Hoods come in a variety of sizes and have customizable options to best suit each machine.

Mounted air cleaners atop the hood pull dust, mist, and fume generated by the machine through high-efficiency filter chambers before exhausting cleansed air into the surrounding environment. *Sentry Air Systems also will help you design a vented walk-in containment system as well utilizing your existing fan system if applicable.

As pictured above, a Sentry Air Machine Enclosure Hood surrounds a heavy-duty cutting machine with an open work surface. This particular machine generates large amounts of dust when cutting. The curtained enclosure is sized so that a worker can enter the hood to program the machine. Four Sentry Air Model 400 air cleaners are mounted to the top of the hood to provide the air circulation necessary to properly filter the enclosure.

The number of air cleaners needed is based partly on the size of the machine to be enclosed.

Walk-in Fume Hoods

DSC_6496Sentry Air Systems Walk-in Fume Hoods are a great solution for workstations that use chemicals or involve processes like welding, grinding or bulk powder transfer. By curtaining off these areas you are essentially creating mini “dirty spaces” for workers to use without spreading these contaminants to other areas of the factory.

By simply enclosing these existing work areas with a walk-in fume hood, factories are able to maximize square footage while simultaneously increasing the quality of air their workers are breathing.

As pictured above, a worker is shown at a cutting station inside a walk-in fume hood. This particular walk-in fume hood is dedicated to a table saw workstation so the dust generated from the saw is contained within the hood.

Similar to the machine enclosure hoods, the walk-in fume hoods also have mounted air cleaners atop the hood that filter pollutants within the hood. Sentry Air Walk-in Fume Hoods also come in a variety of sizes and offer customizable features to best suit each application.

Assembly and Installation

One of the defining characteristics of all Sentry Air Systems products is the ease of implementation. The vast majority of our product line is “plug-and-play” installation while others simply require a screw driver and a few easy assembly steps.

This fundamental design aspect was taken into consideration when developing our machine enclosures and walk-in fume hoods. While they require a bit more than a screwdriver to assemble, these enclosures are designed in such a way that professional installation is not required designed in a manner which makes the installation relatively simple. The installation time and complexity will depend on the size of the enclosure. Generally, customers hire contractors to install these systems, or utilize their in-house facilities services.

Detailed instructions and graphics are provided with each shipment and should only take a few hours to complete assembly.

More importantly, these enclosures are non-permanent structures so moving them around a facility is no problem.


Product Specifications

The chart below outlines the basic specifications for Sentry Air’s walk-in fume hoods and machine enclosure hoods.  Due to the modular design and variety of filter options, our sales specialists work with you to determine the best configuration for your unique application.

  Heavy-Duty Steel Frame Lighter Aluminum Frame
Material 3″ x 3″ Steel Structural Tubing Powder Coated 1/4″ Clear Acrylic Sides 1.5″ x 1.5″ Brushed Aluminum Tubing 1/4″ Clear Acrylic Sides
Height Up to 9 feet Up to 6 feet
Width & Depth Up to 20 feet Up to 6 feet
Weight Steel tubing: 3.29 lbs./ft. Acrylic: 1.44 lbs./sqft Aluminum tubing: .9 lbs./ft. Acrylic: 1.44 lbs./sqft
Options Floor Mounting, Clear Anti-Static Vinyl Strip Curtains, Floor (HDPE), Multiple Filter Units, Collars for Ductwork Floor Mounting, Clear Anti-Static Vinyl Strip Curtains (only one side), Floor (HDPE), Collars for Ductwork
Available Filter Units SS-300-MS or SS-400/450-MS Single or multiple units are available depending on hood size. Wall mounted units with a connecting hose are also an option.

Contact Sentry Air

For more information about walk-in fume hoods and machine enclosure hoods, contact Sentry Air Systems at 800.799.4609, email, visit our website, or fill out the feedback form below.

University utilizes ductless containment hood for bone DNA extraction

Direkli Mağarası'ndaki kazılarda ortaya çıkan kemikler, Anadolu insanının gen yapısına ilişkin ipuçları verecek. (İsmail Hakkı Demir - Anadolu Ajansı)

Traditional DNA specimens gathered at crime and trauma scenes include hair, blood, saliva, and other bodily fluids. In most cases these are excellent sources for identifying human remains.

Unfortunately, if a body is severely decomposed, exposed to extreme environmental conditions, or only skeletal remains are found, it makes recovering DNA that much more difficult. In these extreme cases, forensic scientists are turning to bones.

In an August 2004 article in the Journal of Forensic Sciences entitled “A Simple and Efficient Method for Extraction DNA from Old and Burned Bone”, the authors noted that “compared with the DNA in soft tissue samples, DNA in bone samples is more resistant to the environment’s chemical and physical erosion because of the protection afforded to it by the bone itself.”

University trains students in the art of DNA extraction

sam-houston-state-universityStudents in the Forensic Science Department at Sam Houston State University (SHSU) are learning how to extract DNA from bone specimens gathered from the University’s body farm.

Dr. Sheree Hughes-Stamm, Clinical Assistant Professor of Forensic Science at SHSU, explains the types of DNA one can extract from bone.

“You will be able to extract both nuclear and mitochondrial DNA from bone. However, sometimes the nuclear DNA is too degraded, and/or is in too small amounts to be useful. Therefore mitochondrial DNA is generally used as a last resort for identification.”

In preparation for DNA extraction, students clean the bones with ethanol and bleach. Samples are then ground and cut into powder form. This process creates respiratory hazards for faculty and students and proper engineering safety controls should be implemented to avoid breathing chemical vapors and biological particulate.

The following tables outline both permissible and recommended exposure limits to these hazards as well as known side effects.

Ethyl Alcohol (Ethanol)
Exposure Limits Symptoms
1,000 PPM TWA 

1,000 PPM TWA

·         Irritation to eyes, skin, nose
·         Headache
·         Drowsiness
·         Exhaustion
·         Narcosis
·         Cough
·         Liver damage
·         Anemia


Sodium Hypochlorite (Liquid Bleach)
Exposure Limits Symptoms
0.5 PPM STEL (as Chlorine)

1,000 PPM TWA

·         Irritation to eyes, skin, nose
·         Headache
·         Drowsiness
·         Exhaustion
·         Narcosis
·         Cough
·         Liver damage
·         Anemia

Ductless Containment Hood for Dust and Vapor Control

Sentry Air Systems (SAS) designs and manufactures a line of Ductless Containment Hoods that help control dust and vapor-laden air through the use of high quality filter media.

Contaminants generated within the hood’s work area are pulled via high powered fan through a series of filters before cleansed air is recirculated back into the room. This process of filtering and recycling the air saves both money and space as dedicated ductwork is not required.


Sentry Air at SHSU


Sentry Air Model 330 Ductless Containment Hood shown on the right at SHSU Forensic Lab

As an alumnus of SHSU, Sentry Air Systems Sales Manager, Omar Ilsever, made an in-kind donation to the Forensic Science Department; which included one of our Model 330 Ductless Containment Hoods [SS-330-DCH].

The hood came equipped with HEPA and Carbon filtration to aide in the capture of both bone particulate and chemical vapor.

Now, students and faculty are able to conduct DNA extraction of bone samples within a confined space. This not only helps in reducing cross contamination in the lab, it also helps in protecting their breathing zone from respiratory hazards.


As shown above, SHSU Masters student Michelle Harrel grinds a sample of bone inside the 30” wide Ductless Containment Hood. Vinyl strip curtains attach along the access area of the hood to increase dust containment.


Another angle of the lab shows the fan/filter unit affixed to the top of the hood. Additionally, a fluorescent light is attached for greater visibility within the hood.

Sentry Air Systems is proud to have supplied our Ductless Containment Hoods to laboratories, government agencies, police stations, and universities across North America. It is our continued mission to provide simple solutions for cleaner air and to educate others on the many respiratory hazards found in the workplace.

Contact Us

For more information about chemical vapor and particulate control in a lab setting, contact Sentry Air Systems at 800.799.4609, email, visit our website or fill out the feedback form below.