Chemical Fume Hood
Chemical Fume Hood - Related Videos
05:48
Fume Hoods and Laminar Flow Cabinets
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2023
Robert M. Rioux & William A. Elliott, Pennsylvania State University, University Park, PA Fume hoods and laminar flow cabinets are engineering controls that operate under similar principles. Both use a constant flow of air to prevent contamination of the laboratory environment and its inhabitants. Fume hoods prevent hazardous substances from exiting the hood workspace, whereas laminar flow cabinets prevent contaminants from entering the cabinet workspace. Fume hoods are ventilation systems...
07:07
An Introduction to Working in the Hood
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2023
Hoods are a common class of instrument, which act as a protective enclosure for various types of laboratory experiments. They serve to shield experimental samples from the environment, as well as to protect the researcher from hazardous or infectious samples. “The Hood” is a term that can include laminar flow benches, fume hoods, as well as tissue culture hoods or biosafety cabinets. All hoods operate based on the principle of laminar flow and have the same basic components, including a...
12:55
Chemical Gardens as Flow-through Reactors Simulating Natural Hydrothermal Systems
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Cited by 30 •
2015
We describe chemical garden formation via injection experiments that allow for laboratory simulations of natural chemical garden systems that form at submarine hydrothermal vents.
02:52
Chemical Formulas
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2020
A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural. Molecular Formula The molecular formula represents a molecule or a chemical compound using chemical symbols (to indicate the...
04:17
Chemical Drying: Biological Sample Preparation for Scanning Electron Microscopy (SEM)
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2023
Scanning electron microscopy (SEM) is a powerful tool to image—primarily—the surface features of a biological sample. Proper sample preparation, however, is critical to obtaining quality images. This video focuses on the dehydration and drying steps of preparing intact adult Drosophila for SEM.
FAQs
The exhaust fan pulls room air through the front opening and carries contaminants away from the user. This directional airflow helps capture vapors, gases, and aerosols released during chemical handling rather than allowing them to remain around the breathing zone. Its effectiveness depends on maintaining the intended airflow path while work is performed inside the enclosure.
A lowered sash helps contain chemical contaminants within the enclosure and supports the airflow pattern created by the exhaust system. Keeping the sash at the appropriate lowered position therefore improves protection during procedures involving hazardous reagents. The sash also contributes to controlled working conditions by helping direct contaminated air away from the user.
An unobstructed airflow path allows room air to move smoothly through the opening and contaminants to travel toward the exhaust system. Blocking or disrupting that path can interfere with containment and reduce the hood’s ability to direct vapors, gases, or aerosols away from personnel. Careful arrangement of materials supports more reliable operating conditions.
Airflow checks provide evidence that the enclosure is operating under conditions intended to capture and exhaust hazardous contaminants. Because proper airflow is essential to performance, users should verify the hood’s airflow condition before handling volatile or aerosol-generating reagents. This check helps maintain controlled conditions during biological sample preparation and chemical work.
Place procedures involving hazardous chemical vapors, gases, or aerosols within the enclosure, keep the sash lowered, and preserve an unobstructed airflow path. Users should also perform the required airflow check before starting work. Together, these practices support containment and help reduce inhalation exposure during chemical handling in biology laboratories.
Chemical Fume Hoods are useful when biology work includes volatile solvents, fixatives, stains, or other hazardous reagents. They support activities such as sample preparation and chemical handling by directing released contaminants away from personnel. The resulting controlled working conditions help laboratories manage chemical hazards while carrying out biological experiments.