Is it or is it not C2D2

[dmiller@masonite.com]

We have a very large dust collectors at our plant. This particular one has the Rotary Air Lock outside of the dust collector and underneath it. Everything inside the enclosed part of the collector has been installed as C2D2. Seeing that the Rotary Air Lock is not part of the enclosed confinement of the collector does it fall under a different classification? It is infact about 2' feet below the cone. Yes, when maintenance work is done dust is exposed to the free air but normally disipates quickly.

 

[rbalex]

It depends. Housekeeping and total emissions during maintenance play a major part of the analysis. A review of NFPA 499, especially Chapter 6, will be helpful.

I might be concerned the interior is only Division 2. However, classification is basically an educated judgment.