From Associated Press:
Preparations for the conclave to find a new pope accelerated Friday with the installation of the chimney out of the Sistine Chapel that will signal the election of a successor to Pope Francis.
Vatican firefighters were seen on the roof of the Sistine Chapel installing the chimney, a key moment in the preparation for the May 7 conclave. After every two rounds of voting in the Sistine Chapel, the ballots of the cardinals are burned in a special furnace to indicate the outcome to the outside world.