** Using Place

1. The places in which dust including toxic substances such as beryllium is generated.

(Processed generating carcinogenic or toxic substances)

2. The places in which dust is generated except the places necesary to wear superior masks.

(Weldign, foundry, refining etc, which generate bad smells.)

3. The places in which dust is generated except the places necessary to wear superior and the first class of mask. At treating oily substances (e.g.painting coating with paint), sprinkling agricultural chemicals etc.