what is the minimum distance from hollow brick manufacturing unit and the near by house(residence). In some docs ,it states that it is 25 m distance or 100m or 150m or 200m ? which one is correct Kindly clarify which one is correct. If it is crusher(metal crusher) , then what would be the minimum distance? Whether near by resident's approval is required in putting a new hollow brick manufacturing unit. Kindly explain in detail.