User Manual Part 2

ENGLISH
SOUND NOISE LEVEL
(dB)
EFFECT
Whisper 30 Very quiet
Quiet Ofce 50-60 Comfortable hearing levels
are under60 dB
Vacuum Cleaner,
Hair Dryer
70 Intrusive; interferes with
telephone conversations
Food Blender 85-90 85dB is the level at which hearing
damage (8 hr) begins
Dustbin Lorry,
Cement Mixer
100 No more than 15 minutes of
unprotected exposure recommended
for sounds between 90-100dB
Power Saw,
Drill/Jackhammer
110 Regular exposure to sound over 100dB
of more than 1minute risks permanent
hearing loss
Rock Concert (varies) 110 -140 Threshold of pain begins
around 125dB
* Chart information from http://www.nidcd.nih.gov/health/education/teachers/pages/common_sounds.aspx
This decibel (dB) table compares some common sounds and shows how they rank in
potential harm to hearing.