Originally Posted by Frick
25dB is not noisy.
140 threshold of pain: gunshot, siren at 100 feet
135 jet take off, amplified music
120 chain saw, jack hammer, snowmobile
100 tractor, farm equipment, power saw
90 OSHA limit - hearing damage if excessive exposure to noise levels above 90 dB
85 inside acoustically insulated tractor cab
75 average radio, vacuum cleaner
60 normal conversation
45 rustling leaves, soft music
15 threshold of hearing
0 acute threshold of hearing - weakest sound
Every fan I've had rated at 25dB is noisy, whiney or otherwise annoying.