Ultra quiet machines, as low as 63 dBA, ensures safe sound levels. Active filtration with HEPA standard, maintains indoor air quality. 90 degree flip up head, enables a safe ergonomic position when changing pad. Productivity rate (max): 20,000 ft2/hr; Productivity rate (practical): 18,000 ft2/hr; Transport speed (max): 240 fpm. Pad motor: 36V, 75 A, 2.8 hp max; Pad speed: 2100 rpm. Burnishing speed (variable): Min 100 fpm, max 200 fpm.