6 Product is applied in a wide variety of industrial settings including metal working plants, paint operations, welding  stations, woodworking shops and food processing plants. Essentially all combustion tur- bines require inlet air filtration and noise attenuation systems. These turbines provide base electricity, peaking capacity, remote power generation for special applications such as pipelines and off-shore oil drilling platforms. Products for the  computer disk drive market include particulate filters, desiccant pouches and chemical adsorbing filter pouches. Customers include major disk drive manufacturers such as IBM, Seagate and Western Digital. Products for  special market applications include aircraft cabin air filters, chemical filter systems for semi-conductor processing facilities, as well as other filters for process-critical applications. Donaldson sells  expanded PTFE membrane through its Tetratec unit. Primary appli- cations for this membrane  are industrial dust collection, product recovery applications and specialty fabrics. DUST COLLECTION Under the trade names Torit, DCE and Aercology, Donaldson provides equipment to control and capture process dust, fumes and mist in manufactur- ing and industrial processing plants. In addition, a full line  of replacement filter cartridges, bags and spare parts are offered. GAS TURBINE SYSTEMS Donaldson provides complete systems to deliver clean air to combustion turbines. Products include self-cleaning filter units, static air filter units, inlet duct- ing and silencing, evaporative coolers, chiller coils, inlet  heating and anti-icing systems. Also, a full line of replacement filters and parts is offered. SPECIAL APPLICATIONS Donaldson provides a wide range of high efficiency media, filters and filtration systems for various commercial, industrial and product applications. $ 217 MILLION $ 195 MILLION $ 118 MILLION PRODUCTS ROUTES TO MARKET 2001 REVENUE APPLICATIONS Dedicated field sales force coordinates multiple selling channels to end-users includ- ing: direct selling, distribution, installers, OEM accounts and telemarketing. Products are primarily sold  to gas turbine OEMs (e.g., General Electric, Solar,  Siemens Westinghouse). Replacement parts are sold direct to end-users. Products are sold to disk drive manufacturers by a direct sales force supported by product development and application engineers. Products are primarily sold direct to end-users. Membrane and laminates  are sold to various filter and garment manufacturers. $^{2001 Revenue }$$ 530 MILLION INDUSTRIAL PRODUCTS  Operating Segment 