Chicago Pneumatic offers their line of Quiet Rotary Screw (QRS) air compressors with features that include a design, which, according to the company, can reduce operating noise by as much as 60 percent. Additional benefits cited by CP include lower maintenance and operating costs, as well as a size that consumes less shop floor space. The QRS is available in 14 different models, from 3 HP to 15 HP, and can be equipped with built-in air dryers to keep tools and equipment free from water damage.