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Vatican workers install a chimney on the roof of the Sistine Chapel at the Vatican May 2, 2025. Connected to a stove in the chapel where the ballots will be burned during the conclave to elect a new pope, the chimney will signal to the world whether a new pope has been elected. (CNS photo/Lola Gomez)

VATICAN CITY (AP) — 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.

If no pope is chosen, the ballots are mixed with cartridges containing potassium perchlorate, anthracene (a component of coal tar) and sulfur to produce black smoke. But if there is a winner, the burning ballots are mixed with potassium chlorate, lactose and chloroform resin to produce the white smoke.

The white smoke came out of the chimney on the fifth ballot on March 13, 2013, and Cardinal Jorge Mario Bergoglio was introduced to the world as Pope Francis a short time later from the loggia of St. Peter’s Basilica.

The chimney installation took place as cardinals arrived in the Vatican for another day of pre-conclave discussions about the needs of the Catholic Church going forward and the type of pope needed to run it.

These consultations include all cardinals, including those over age 80 who are ineligible to vote in the conclave itself.

In recent days, they have heard reports about the Vatican’s dire financial situation, and have had the chance to speak individually about priorities going forward and problems they identified in Francis’ pontificate.

Read next: What time will we see black or white smoke? Past conclaves give clues.

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