All XLERATOR models operate at 65 to 75 decibels with a .8” standard nozzle (black) but can jump to over 90 decibels if hands are perpendicular to the air stream and held extremely close to the air outlet. Our free 1.1” noise reduction nozzle (gray) lowers the decibel level of an XLERATOR 9 dB by reducing air deflection noise but increases the dry time by approximately 3 seconds. In addition, adjustable speed and sound control is included in all XLERATOR models. The control allows owners to adjust the speed and sound of the unit to their liking.