APPARATUS AND METHOD FOR CONTROLLING AND DIRECTING FLOW OF CONTAMINATED AIR TO FILTERS AND FOR MONITORING FILTER LOADING IN A BIOLOGICAL SAFETY CABINET
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United States of America Patent
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Issued Date -
Oct 6, 2011
app pub date -
Apr 2, 2010
filing date -
Apr 2, 2010
priority date (Note) -
Abandoned
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Abstract
An improved system and method for monitoring contamination loading of a filter in a biological safety cabinet comprising a housing defining a work chamber and a filtration chamber, a system for circulating air between the work chamber and the filtration chamber via a fan which draws air under negative pressure from the work chamber and delivers the air under positive pressure through the filter and into the filtration chamber. The filter monitoring system determines a pressure differential between the negative and positive air pressure at opposite sides of the fan, and evaluates the degree of contamination loading of the filter on the basis of the pressure differential. An air flow baffle is disposed within the filtration chamber adjacent the fan for dividing the pressurized air delivered by the fan and partially redirecting a portion thereof for more uniformly delivering the air to the filter.
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