Experts told the BBC that the process requires "two custom fireworks", smoke test rehearsals and Vatican firefighters on standby. EPAInside the Sistine Chapel, two stoves are temporarily installed specifically for the conclave: one for burning ballots, the other to generate the smoke signals. The Sistine Chapel, which was built more than 500 years ago, is home to one of the most famous ceilings in the world. Even Vatican firefighters are involved; on standby in case of malfunction. Chimney installed on Sistine Chapel ahead of papal election