Profile: Hoff Engineering Co., Inc. is engaged in designing, testing and manufacturing pleated industrial filters. We work with manufacturers to develop air and liquid filters to exact requirements. We offer a complete filter development laboratory that combines flat sheet testing and full element performance testing for air and liquid applications. Our test fluids include fuels, hydraulic and dielectric oils, coolants and deionized water. We develop proprietary filter media, custom element construction and job-specific housing designs to optimize filter performance.