exhaust fume hood
Fume hoods are ubiquitous in industrial, medical, and university
research facilities. They are box-like structures often mounted
at tabletop level with a movable window-like front called a sash.
Fume hoods capture, contain and exhaust hazardous fumes created
during industrial processes or laboratory experiments.
Generally, fumes are drawn out of a hood by fans through a port
at the top of the hood. Pharmaceutical and biotechnology facilities
have hoods, as do facilities ranging from industrial shops, to
medical testing labs, university research labs, and high school
"Fume hoods typically require large exhaust flows and are
usually never turned off, so they use a tremendous amount of energy
both in fan power and in heated and cooled room air," said
co-developer Geoffrey Bell. "The hood could save typical
industrial facilities hundreds of thousands of dollars a year
in energy costs."
Hood use is growing rapidly in California. Besides biotech and
high tech, universities and colleges are building labs to keep
up with the demand for science education. Hoods contribute to
the high energy cost of these buildings -- often four to five
times more expensive than
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