The report examines the systematic nonuniformities inherent in multicompartmented baghouse operation, and analyzes the over-all performance in relation to the characteristics of the individual compartments. Those properties of an operating unit which can be used to characterize the installation are delineated, and a methodology developed whereby critical values of these properties may be calculated from easily obtainable field measurements. The critical characteristics are defined as the residual filter drag of a compartment, the terminal filter drag of a compartment, and the residual velocity. The utility of these characteristics to determine the cause of operating difficulties is discussed. (Author Modified Abstract)