[. . . ] [. . . ] Sound characteristics (NC-Curve) RAS-3M23YACV-E, RAS-3M23GACV-E Fan Tap Sound pressure level (dB(A)) 90 Cooling 48 80 70 Sound pressure level (dB) NC-70 60 NC-60 50 NC-50 40 NC-40 30 NC-30 20 Audibility limits of continuous white level 75-150 150-300 300-600 600-1200 1200-2400 Front 1m NC-20 2400-4800 4800-10000 10 20-75 Frequency band (Hz) [. . . ] [. . . ]