Donaldson Company Inc.

Bell Helicopter Selects Donaldson to Protect Bell 525 Relentless Transmissions, Engines

LONDON, UK, September 24, 2013 – Donaldson Company, Inc. (NYSE: DCI) has been selected by Bell Helicopter to provide advanced filtration systems for the protection of all gearboxes and engines on its newest helicopter, the Bell 525 Relentless.

Donaldson Aerospace & Defense Group will begin supplying transmission oil filter assemblies for installation in the Bell 525 Relentless’ main rotor gearbox, tail rotor gearbox, intermediate gearbox and reduction gearbox in 2014. The new helicopter has been designed in part for customers seeking greater payload efficiency, range and reliability in transporting crews to more distant offshore oil and gas platforms.

Donaldson has also finalized the terms of a contract with Bell to develop and provide Inlet Barrier Filter (IBF) systems as factory-installed options to protect the Bell 525 Relentless’ two main General Electric CT7-2F1 engines and Honeywell RE100 auxiliary power unit from the damaging and performance-degrading effects of dirt, dust, salt, sand and foreign objects.

Donaldson is currently designing the new IBFs and will deliver prototypes to Bell in early 2014 for the first flight of the Bell 525 Relentless later that year. Bell customers will have the option of selecting the basic engine inlet or the inlet design that integrates the Donaldson IBF. The IBFs also would be available for retrofit on the helicopter.

Launched in February 2012, the Bell 525 Relentless was designed with the assistance of select customers to carry up to 16 passengers and two pilots. In addition to the offshore oil industry, it is targeted at search and rescue, corporate/executive transport and emergency medical services missions. The Bell 525 Relentless will incorporate advanced technologies that include fly-by-wire flight controls, a touch-screen-controlled flight deck and the Donaldson advanced filtration systems.

“Like Bell Helicopter, Donaldson has a long history of technological innovation that provides industry-leading performance and reliability to our customers,” said Mark Rigby, General Manager of Global Aerospace & Defense. “We are proud to be working with Bell on the 525 Relentless, which will set new standards of capability for the helicopter industry.”

For nearly a century, Donaldson has been developing and manufacturing lightweight, compact, advanced filtration solutions. Its products meet or exceed original equipment manufacturers’ specifications and international quality requirements and keep flight-critical aircraft components running efficiently and effectively. Customers count on Donaldson’s comprehensive product line to help them maintain mission readiness. With its proprietary technology and unmatched reputation for quality, service and reliability, Donaldson leads the way in meeting the unique filtration requirements of aerospace and defense customers worldwide.

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

About Donaldson’s Aerospace & Defense Group

Donaldson’s Aerospace & Defense Group 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 and 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 approximately 12,600 employees contribute to the Company’s success by supporting our Customers at our more than 140 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.

About Bell Helicopter

Bell Helicopter, a wholly owned subsidiary of Textron Inc., is an industry-leading producer of commercial and military, manned and unmanned vertical-lift aircraft and the pioneer of the revolutionary tiltrotor aircraft. Globally recognized for world-class customer service, innovation and superior quality, Bell's global workforce serves customers flying Bell aircraft in more than 120 countries.

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