Abstract: A grid-frame stabilizer and method of operation for an electrostatic precipitator includes a rigid stand-off member that prevents oscillation of a grid frame used to keep discharge electrodes of the precipitator separated from one another. One end of the stand-off member is rigidly connected to the grid frame and the other end is rigidly connected to a fixed housing component through at least one electrical isolator. The fixed housing component is firmly affixed to an interior region of the precipitator. The stand-off member passes into the housing component through a housing opening which is preferably sealed by a membrane designed to prevent particle contamination of the surfaces of the electrical isolators.