Donaldson Aerospace & Defense, a division of Donaldson Company, Inc. (NYSE: DCI), has completed another successful year characterized by new products, a new facility, and delivery of its 5,000^th Inlet Barrier Filter (IBF) system. New this year, at Heli-Expo 2012, in Dallas, Texas, Donaldson will utilize an interactive touch screen application to showcase its rotorcraft products. Visitors may experience the company’s rotorcraft filtration products in a 3-D environment as they learn about the unique benefits of IBF systems in Exhibit 8451.

“In 2012, we will be developing new technologies to address the challenges created by emerging helicopter designs with increased speed and size,” said Michael Scimone, president of Donaldson’s St. Louis office. Donaldson will also introduce its Universal Filtration Unit featuring flexible architecture that can be used on multiple platforms without the need for extensive aircraft integration.

“Experience has proven the vitality of increased inlet protection. Old paradigms are being broken,” Scimone said. “Documented return on investment data provides a compelling argument for customers to implement our inlet filtration solutions. With our technical experience in barrier and inertial filtration solutions, we can provide the most flexible design configurations to meet our customer’s requirements even as those requirements change.”

Donaldson’s market preeminence is based on decades of experience in world-class research and development of exceptionally innovative and effective filtration solutions for aerospace, military vehicles and industry, as well as highly capable management and responsive customer support. 2011 reinforced the Donaldson Aerospace & Defense record with:

Providing the most comprehensive line of IBF solutions, Donaldson Aerospace & Defense is the industry leader in the design, development and manufacture of high-performance engine IBF systems for commercial and military propulsion systems. Through its St. Louis, Missouri location, Donaldson provides certified IBF solutions for the AgustaWestland AW109E/S/SP, AW119 Koala, AW119Ke and AW139; Bell 205A1, 206B, 230, 407, 206L-3/4, 206L-1(C30), 429 and 430; Eurocopter EC130, AS350 B/BA/B1/B2/B3/B3e, AS350s with Soloy or Heli-Lynx Honeywell engine conversions; MD Helicopters MD 369H Series, MD 500D/E/F and MD 900/902, and Sikorsky S-61.

Donaldson Aerospace & Defense is a leading worldwide provider of filtration systems for the aerospace and defense industry. Our filtration solutions protect fixed wing aircraft, rotorcraft, military ground vehicles, electronic equipment, space vehicles, missiles, military shipboard systems, and amphibious vehicles. We are committed to advancing filtration technology, providing quality products and prompt customer service. Our group serves customers from sales, engineering, and manufacturing locations around the world.  To learn more, please go towww.DonaldsonAerospace-Defense.com.

Donaldson is a leading worldwide provider of filtration systems that improve people’s lives, enhance our Customers’ equipment performance, and protect our environment. We are a technology-driven Company committed to satisfying our Customers’ needs for filtration solutions through innovative research and development, application expertise, and global presence. Our over 12,900 employees contribute to the Company’s success by supporting our Customers at our more than 100 sales, manufacturing, and distribution locations around the world.

Donaldson is a member of the S&P MidCap 400 and Russell 1000 indices, and our shares trade on the NYSE under the symbol DCI. Additional information is available at www.donaldson.com.