What was found
PHL - FL 221 - AN UNKNOWN ODOR CAME FROM GASPER FAN DURING CLIMB. WHEN GASPER FAN WAS TURNED OFF, ODOR DISSIPATED. NO OTHER ODOR WAS NOTED UNTIL LANDING, WHEN ODOR BECAME APPARENT WITH GASPER FAN ON AGAIN. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE RAN ENGINES AND CHECKED GASPER FAN FOR FURTHER ODOR AND SMOKE. CABIN AND FLIGHT COMPARTMENT CHECKED NORMAL. SUBSEQUENTLY, MAINTENANCE REMOVED AND REPLACED THE GASPER FAN. OPERATIONAL CHECK GOOD. (X)