The Vatican is finalizing preparations for the May 7 conclave, with firefighters on Friday installing a chimney on the roof of the Sistine Chapel.

On Friday morning, May 2, Vatican workers were seen hoisting a chimney onto the roof at the Sistine Chapel, according to photos and video taken by Reuters. The chimney will soon be used to display the smoke from burnt ballots during the conclave to elect Pope Francis’ successor.

Vatican workers have installed the simple stove in the Sistine Chapel where ballots will be burned during the upcoming conclave to elect a new pope.