When the research and development department of Donaldson engaged in more exact and optimised design for dust filters elements they discovered that a round filter cross-section is only the second best solution. Computer supported flow simulations made evident that oval filter cartridges provide a noticeable higher air flow capacity and exhibit longer lifetimes than the traditional round filter cartridges. The reason for this is the fact that the elliptic filter form provides a reduced profoundness in the pleats of the filter media, and allows for increased spacing between the pleats. Hence the air flow rate is higher and the plated walls are stable with regard to the distance to another – the best pre-conditions for low differential pressure, long lifetime and high dirt absorption capacity.

This gained knowledge was then applied to the new filter cartridge series with elliptical cross-section. The Ultra-Web^® with its matured technology and distinguishing feature of a very good separation efficiency of 99,999% for 0,5 µm particles is used for the filter media. A nano-fiber layer on the media guarantees that even the smallest particle is precipitated by the filter surface. This leads to the creation of an evenly spread filter cake which can effectively and with minor energy input be cleaned.

The new filter cartridges are amongst others used in the new Downflo Oval 1 dust filter. These filter systems are exceptionally compact and high in performance. The combination of oval filter cartridges and an optimised de-dusting system, of which the efficiency has been improved by 30%, allows an increased air flow rate of 10%. Consequently in many cases the user can select a smaller housing and save costs or for the same construction size receive more performance.

With these characteristics the Downflo Oval 1 dust filter opens up a wide application spectrum which ranges from the pharmaceutical industry to metal processing (laser cutters, grinding, sand blasting….) to the processing of abrasive materials. An efficient service, with 80 service technicans alone in Germany, takes care of the supervision of filter systems and if desired also the responsibility for exchanging the filter elements at an optimal point in time. This is the purpose of „Total Filter Management“.

The innovative development and the efficiency of the new dust filter series has also been accredited by the experts: The American trade journal „Filtration and Separation“ has voted the Downflo Oval 1 as „product of the year“.

Donaldson Filtration Deutschland GmbH Industrial Filtration Solutions
Büssingstr. 1, 42781 Haan, Deutschland, Tel.: 02129-569-0
Fax. 02129-569-100 E-Mail: IFS-de@donaldson.com, www.donaldson.com

About Donaldson Company
Donaldson is a leading worldwide provider of air and liquid filtration systems and replacement parts 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 diesel engine equipment and industrial filtration solutions through innovative research and development, superior technology, and global presence. Our 12,000 employees contribute to the company's success by supporting our Customers at 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.