PBS Furniture Products is a top manufacturer of fume hoods in the USA. We’re committed to giving labs the best way to work safely with dangerous substances. Our fume hoods keep lab workers safe from bad fumes, vapors, and dust that come up during experiments and studies.
We test our fume hoods to ASHRAE 110 and ANSI Z9.5 standards, so you can be sure they provide the best protection and safety for the user. As one of the best fume hood manufacturers in the USA. We provide detailed advice on how to find the right fume hood for your lab’s needs. Our committed support team makes sure installation goes smoothly and helps you keep your fume hood working perfectly.
A fume hood, also known as a lab hood or chemical hood, protects workers from breathing harmful chemicals. The sash is a clear screen that moves on a fume hood and protects employees from any drops or spills that can happen within the fume hood.
A usual lab fume hood is box-shaped with a window that can be moved. You do experiments inside it, and it’s always ventilated safely, often using a fan and pipes. It sends chemical fumes out into the air, where they’re spread out so much, they hardly affect people’s health. If we need to protect the environment, we use a special cleaning system, often called a scrubber, to get rid of most of the fumes before they go out into the air.
A fume hood works by keeping a slightly lower pressure inside it to stop any harmful substances from getting out. It pulls air in through the front opening at a steady speed. Having the right speed for the air coming into the hood is crucial for it to work safely and well. If the air comes in too fast, it can cause mixing and make the hood less effective. If it’s too slow, the hood might not work properly.
Std. Bench type of lab fume hood is characterized by an std. worktop height which results in a std. working height for the operator. This allows Std. height of equipment to be installed and mounted in the work chamber, tested in acc. with EN 14175.
Low Bench type of Fume Hood is characterized by a low worktop height which results in a large working height for the operator. This allows tall distillation equipment to be installed and mounted in the work chamber, tested in acc. with EN 14175. Rest of the items remains same as Std. Bench Type of Fume Hood.
Walking / Floor mounted fume hoods are used for applications which require large apparatus. As the name implies, these hoods are floor mounted without any work surface. This facilitates the transfer of equipment and materials into, and out from the hood.
Education Fume Hood has all 4 sides made of safety glass, and this hood is commonly used in educational institutions to allow students to easily view the teachers’ demonstrations inside the fume hood from all angles, enhancing efficiency in teaching laboratories, tested in acc. with EN 14175.
The visible part of the lab fume hood serves to contain hazardous gases and vapors.
Moveable partitions used to create slotted openings along the back of the hood body. Baffles keep the airflow uniform across the hood opening, thus eliminating dead spots and optimizing capture efficiency.
The sliding “door” to the hood. By using the sash to adjust the front opening, airflow across the hood can be adjusted to the point where capture of contaminants is maximized. Each hood has its optimum sash configuration. The sash should be held in this position when working in the hood and closed completely when the hood is not in use. The sash may be opened completely to set up equipment, but must be returned to the optimum setting prior to generating contaminants inside the hood. Hoods are equipped with one of three types of sashes:
provide the greatest overall access and are the most common.
sashes provide the best access to the top interior of the hood, but do not provide access to the entire width at the same time. However, they can be positioned as a body shield to protect the operator, while enabling access through the sides.
combine horizontal sash panes, in a vertical rising frame. As such, they offer the advantages of both vertical and horizontal sashes.
located along the bottom and side edges the airfoil streamlines airflow into the hood, preventing the creation of turbulent eddies that can carry vapors out of the hood. The space below the bottom airfoil provides source of room air for the hood to exhaust when the sash is fully closed. Removing the airfoil can cause turbulence and loss of containment.
generally a laboratory bench top, or the floor in the case of a floor-mounted hood, this is the area where the work is conducted.
the exhaust plenum helps distribute airflow evenly across the hood face. Materials such as paper towels drawn into the plenum can create turbulence in this part of the hood, resulting in areas of poor airflow and uneven performance.
the imaginary plane between the bottom of the sash and the work surface. Hood face velocity is measured across this plane.
In this case the velocity in the front of the fume hood is measured using an anemometer at 6 different locations with 18 inch sash opening. The average reading as per the norms should confirm to 100 FPM
In this test a smoke generating machine is been used to generate smoke and the gas is traced for correct air flow dynamics. The gas should flow through the baffles as required.
In this test HF6 gas is used to check if the containment of air in the fume hood is proper or not. HF6 is a gas which has the highest density.
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