K-501 & K-502 BELTS KICKED OUT. EMPLOYEE WENT TOINVESTIGATE. AT THE FEED FLOOR SMOKE WAS COMING OUT OF STONE CHUTE. I-D FAN WAS INCREASED, REMOVING SMOKE. LATER EE COMPLAINED OF CHEST PAINS. AS A PRECAUTION HE WAS IMMEDIATELY TRANSPORTED FOR MEDICAL TREATMENT DUE TO HIS ASMATIC CONDITION. NO OTHERS NEEDED TREATMENT. NO LOST TIME.