Dick are you measuring the dust levels in the shop to see how good that 1hp DC is at collecting the fine dust that is not easily seen and causes the health issues? Lots of people have the Dylos meters to measure their dust levels. If you want to make one for less money (under $100) there is a thread on it in another forum. If you want a link PM me. Just because you aren't picking big boogers doesn't mean you are safe.