The paper describes the Environmental Technology Verification (ETV) Program for baghouse filtration products developed by the Air Pollution Control Technology Verification Center, one of six Centers under the ETV Program, and discusses how it benefits boiler baghouse operators. A generic protocol was developed for testing particle filtration efficiency for particles less than 2.5 micrometers in aerodynamic diameter. Total particle removal efficiency and pressure drop data are also reported. Fifteen products (both membrane and nonmembrane filter media) from 10 manufacturers have been tested to date. The results are reported in verification reports and verification statements. The ETV Program was started by the U.S. Environmental Protection Agency in October 1995 to generate independent and credible data on the performance of innovative technologies that have the potential to improve protection of public health and the environment. The purpose of the program is to help organizations, industries, businesses, states, communities, and individuals make better-informed decisions when selecting new environmental technologies. Participation is voluntary. No approvals are granted. No standards are certified. No guarantees or recommendations are made. Quality data, responsive to customer need, is the product. The ETV Program's success depends on obtaining and communicating information about the performance of technologies to those who decide on the selection and implementation of environmental solutions. Forecasts indicate a big market for new and retrofit fabric filters.