St. Louis, Mo., March 3, 2011 – Donaldson Aerospace & Defense, a division of Donaldson Company, Inc. (NYSE: DCI), will display its new Inlet Barrier Filter (IBF) system for the AgustaWestland AW109 Power, Grand, Grand New (E/S/SP) helicopters during Heli-Expo 2011 (Exhibit 4428) in Orlando, Fla., March 6-8, 2011.

With this new IBF solution, AW109 Power and Grand operators will enjoy reduced operating costs without expriencing performance or drag penalties. Company officials are working towards U.S. Federal Aviation Administration (FAA) certification this spring and have completed initial company flight testing.

“We are proud to offer a proven barrier filtration solution for this sleek and speedy helicopter,” said Michael Scimone, president of Donaldson’s St. Louis operation. “What we have developed, with the assistance of AgustaWestland, is a drop-in IBF system with minimal installation impact.”

The new IBF system for the AW109 features streamlined conformal filter assemblies on each side, mounted into the existing engine cowl. As with all certified Donaldson IBFs, the system includes an alternate inlet air bypass system, mounted and hidden within the AW109 upper aft fairing. This emergency bypass capability is an important IBF feature, not included with particle separator alternatives. The IBF does not interfere with the sliding door on either configuration, and filter design allows for quick removal and service.

A simple compact cockpit switch, common with existing Donaldson certified systems, allows indication and activation of the bypass system. And, as with all Donaldson IBFs, an integral Filter Maintenance Aid allows for on-condition inspections pre- and post-flight. A new access panel has been added for easy access to the bypass system and maintenance aid so pilots and ground crew may perform quick and simple pre-flight assessments.

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, Mo., location, Donaldson provides certified IBF solutions for the AgustaWestland AW119 Koala, AW119Ke and AW139, Bell 205A1, 206B, 407, 206L-3/4, 206L-1(C30), 429 and 430; Eurocopter EC130, AS350 B/BA/B1/B2/B3, AS350s with Soloy or Heli-Lynx Honeywell engine conversions and MD Helicopters MD 369H Series, MD 500D/E/F and MD 900/902.

Visit Donaldson Aerospace & Defense at the upcoming Heli-Expo 2011, Booth 4428 in Orlando, Fla., March 6-8.

To learn more about the Donaldson Aerospace & Defense group, visit www.DonaldsonAerospace-Defense.com.

About Donaldson Aerospace & Defense
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.
About Donaldson Company

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 12,500 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.