After a long search, i purchased a HF dust collector (small, single bag unit - 94029).
I chose it becuase it was $99 and boasted 914 CFM. Now I know why it was so cheap - 112 dB! That's injury range and certainly not something you can use in the house!
For reference, here's some decibel information:
Painful
150 dB = rock music peak
140 dB = firearms, air raid siren, jet engine
130 dB = jackhammer
120 dB = jet plane take-off, amplified rock music at 4-6 ft., car stereo, band practice
Extremely Loud
110 dB = rock music, model airplane
106 dB = timpani and bass drum rolls
100 dB = snowmobile, chain saw, pneumatic drill
90 dB = lawnmower, shop tools, truck traffic, subway
Very Loud
80 dB = alarm clock, busy street
70 dB = busy traffic, vacuum cleaner
60 dB = conversation, dishwasher
I was planning on installing outside anyway, to keep the fine dust out of the shop (since it has a 35 micron bag) and was going to build a small weatherproof box.
Now I feel obligated to save my neighbors and build in some soundproofing. Does anyone know a good source of sound dampening material? I don't need to make it silent, just need to get it down to lawnmower level.
Thanks!
John