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Iain Walker, Ph.D., Lawrence Berkeley National Laboratory
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Max H. Sherman, Lawrence Berkeley Laboratory
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Brett Singer, Ph.D., Lawrence Berkeley National Laboratory
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Woody Delp, Ph.D., Lawrence Berkeley National Laboratory
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Chris Stratton, Lawrence Berkeley National Laboratory
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Cooking has been identified as a major source of contaminants of concern for health in residential buildings. Cooking pollutants can be significantly reduced by using range hoods that exhaust to outside, and range hoods are required in Indoor Air Qaulity standards, such as ASHRAE 62.2. However, previous field and laboratory studies have shown that the capture efficiency of range hoods varies widely - even at the same air flow. Currently there is no way for standard developers, designers or installers to specify better capture efficiency. Over the past couple of years LBNL has been conducting laboratory experiments to develop a test method to determine capture efficiency for residential range hoods so that they can be tested and labeled. This test method development has been performed in collaboration with a wide range of constituents, including range hood manufacturers, via the development of an ASTM test method based on the LBNL research. This papr summarizes previous capture efficiency experiments and describes the tracer-gas based test method that has been developed. This includes the laboratory testing procedures and test results for several range hoods. In the development of the test method the laboratory experiments included investigations of spatial and temporal variability in tracer gas concentrations. These were used to develop uncertainty analyses for the proposed test method that will be also be presented.
