Faced with fugitive dust regulations and dust-disposal constraints, many producers have selected closed-loop dust collection systems to contain not only dust emissions but costs. By recycling captured cement dust, producers reduce disposal and material costs. "Since we installed our closed-loop system this spring, we have reduced our annual fly ash purchases by around 10% based on the same concrete production volume," says Pete Madgar, vice president at Nazcon Inc., a ready-mixed concrete producer located in Beltsville, Md. keywords: dust, recycle, collector