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They found that this design's "effective clean air delivery rate [CADR] increase[d] with fan speed, from about 600 to 850 ft 3 min −1 (1019 to 1444 m 3 h −1)". [3] Based on the cost of their design, this output amounted to $0.08 per CADR, or roughly ten times cheaper than commercial air purifiers, with quieter operation.
Cordierite Diesel Particulate Filter on GM 7.8 Isuzu. Unlike a catalytic converter which is a flow-through device, a DPF retains bigger exhaust gas particles by forcing the gas to flow through the filter material before exiting; [2] [29] however, the DPF does not retain small particles.
Started as Donaldson Engineering, a small business built around Frank Donaldson's air intake filter invention (engine air cleaner). [15] Frank Donaldson invented the air intake filter while repairing a tractor in Utah. The business was incorporated in 1915 by Donaldson, his parents and his siblings as Donaldson Company Inc. [16]
Scotchgard is a 3M brand of products, a stain repellent and durable water repellent applied to fabrics, upholstery, and carpets to protect them from stains. Scotchgard products typically rely on organofluorine chemicals as the main active ingredient along with petroleum distillate solvents.
The Times said that it was the "second major clean of a hazardous waste area in Minnesota to be financed entirely by a private company." The three dumps, that had been abandoned by 3M, had "contaminated ground water and soil with hazardous chemical wastes", according to environmental officials. [31]
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