MINNEAPOLIS (Dec. 14) – Donaldson Company (NYSE:DCI), a leading, worldwide manufacturer of filtration systems and parts, announced today that Dr. Chuanfang (Ted) Yang will speak at the Southwest Research Institute (SwRI) 8th International Filtration Conference (IFC) on Jan. 17, 2007 in San Antonio, Texas.

The IFC, the world's leading mobility filtration conference, targets users and suppliers of ground, sea, and air mobility filtration environments by presenting technical papers. This year the subject is mobility filtration issues with emphasis on real-world problem solving, applications, future user requirements, and applicable test methodology.

Dr. Yang will discuss the paper "Understanding Emulsified Water Filtration from Diesel Fuels," which he authored with Stephen Larson and Steve Wagner, also of Donaldson. The paper explores high diesel fuel surfactancy, particularly for additized ultralow sulfur diesel fuel (ULSD), and found that a decrease fuel/water interfacial tension (IFT) and lowered microseparometer rating (MSEP) for increased surfactancy. This effectively caused an increased stability of water-in-fuel emulsion.

This research concluded that filtration becomes more difficult with lower IFT and MSEP and a decreased size of the water droplet, even with composite coalescing materials. With careful material engineering, research found it is possible to filter emulsified water with over 95% efficiency at very low IFT and conventional fuel flow rate. Additionally, it was confirmed that media face velocity significantly affects the filtration efficiency. Dr.Yang recommends the consideration of a test standard with specified fuel proprieties such as IFT and MSEP.

For more information about Donaldson filtration products visit the company website at www.donaldson.com, or contact Donaldson at 800/374-1374.

About Donaldson Company
Donaldson is a leading worldwide provider of filtration systems and replacement parts. We are a technology-driven company committed to satisfying customers' needs for filtration solutions through innovative research and development. We serve customers in the diesel engine and industrial markets providing filtration solutions for off-road equipment and on-road trucks, in-plant air cleaning, compressed air and gas purification, power generation and disk drive filtration. Our 11,500 employees contribute to the company's success at over 35 manufacturing locations around the world. Donaldson is a member of the S&P MidCap 400 Index and Donaldson shares are traded on the NYSE under the symbol DCI. Additional company information is available at www.donaldson.com.