USING A GENIE (EXTENSIBLE AERIAL MANLIFT) TWO MEN WERE ATTEMPTING TO CLEAN OUT PIPE. THEY HAD CLEANED ABOUT 2' WHEN 13"" BY 20' OF FROZEN FINES AND ICE CAME OUT, STRIKING INJURED ON HIS RIGHT A NKLE AND KNOCKING OTHER EE OUT OF THE BASKET, WHERE HE HUNG FROM HIS LANYARD.