reducing motor noise

[Steve knight]

After talking apart my melted fein to see how they reduce the noise it is pretty amazing to knock down a 100db motor to about 65db's with just a little foam and a plastic shell.
so the foam they use is a open cell foam a little stiffer then standard foam is. I can knock down about 6dbs by putting regular foam into the air inlet. another db wrapping the fein foam around the motor like it is done on the fein.
so any idea what foam to use? I have to order it so I need an idea what to buy.
I have made a wooden enclosure for two of the fein type motors for my vac table.

[Steve knight]

here are some pics. the fans are the cooling fans that lets these run in vac mode like they do. but most of the noise is from them. Just setting a piece of the foam that comes with the fein over them drops the noise from 100db to about 93db. or setting the top over them. another db or to if I cover the air inlet with foam. I tested normal foam and it did nto do anything.
http://i154.photobucket.com/albums/s266/knighttoolworks/posting/2C03D01C.jpg
http://i154.photobucket.com/albums/s266/knighttoolworks/posting/E68A288E.jpg
http://i154.photobucket.com/albums/s266/knighttoolworks/posting/A7657504.jpg

[John Lanciani]

Look here; http://www.silentsource.com/index.html They have everything you'll need.

(No affiliation, just a customer)