Figures it would be walnut.
Here's an easy way to test your dust collector . shop vac or what ever your using for effectivness. Get a container of Johnson and Johnson Talcum powder. Put on your dust mask and turn on your dust collector. Pour some of the talc out for the system to suck it up. If it is really ineffective you will have talc in the air. If it is slighlty effective you will have the smell, and if is effective you will have nothing.
The reason for your dust mask is because if your system is ineffective talc is considered a hazard. Inhaled in large enough qualities it can cause suffacation as it will coat the lungs.
![006[1]](http://www.woodcarvingillustrated.com/forum/images/smilies/006[1].gif)
powder is the same. But it is also one of the smallest powders , safest powders and a quick way to check a system.
Ash