Air and Waste Management Association Conference December, 2002 San Francisco CA. 1 Quality Assured Measurements of Livestock Building Emissions: Part 4. Building Ventilation Rate Kenneth D. Casey University of Kentucky, 128 CE Barnhart Bldg. Lexington, KY 40546 Eileen Fabian Wheeler Pennsylvania State University, 249 Agricultural Engineering Bldg. University Park, PA 16801 Richard S. Gates University of Kentucky, 128 CE Barnhart Bldg. Lexington, KY 40546 Hongwei Xin Iowa State University, 100 Davidson Hall, Ames, IA 50011 Patrick A. Topper Pennsylvania State University, 249 Agricultural Engineering Bldg. University Park, PA 16801 Jennifer Smith Zajaczkowski Pennsylvania State University, 249 Agricultural Engineering Bldg. University Park, PA 16801 Yi Liang Iowa State University, 100 Davidson Hall, Ames, IA 50011 Albert J. Heber Purdue University, 225 S. University St., West Lafayette, IN 47907 Larry D. Jacobson University of Minnesota, 1390 Eckles Ave, St. Paul, MN 55108 ABSTRACT Standard protocols for sampling and measuring gas, dust and odor emissions from livestock buildings are needed to guide scientists, consultants, and regulators. Recently, two federally funded, multi-state projects have initiated field studies to measure emissions of PM10, TSP, hydrogen sulfide, ammonia, carbon dioxide, methane and volatile organic compounds (VOC) from swine and poultry production buildings. This paper will focus on the quasi-continuous measurement of building ventilation rate from these facilities. Since emission rate is the product of pollutant concentration and exhaust air flow rate, both quantities need to be accurately determined for estimates of pollutant emissions to be valid. As the ventilation exhaust capacity of a mechanically ventilated livestock building may be provided by between 1 and 75 fans, determining ventilation rate at any point in time or cumulatively over a monitoring period is not a trivial task. As part of the data collected during the measurement of pollutant concentration from livestock and poultry production buildings, fan status (on/off) and building static pressure are being recorded. Fan capacity could be taken from manufacturer’s fan data or independent fan test data where available. However, it well-known that mechanical condition and degree of maintenance can significantly affect actual fan capacity.