Tailors have completed sets of clothes for the new pope to wear as soon as he is elected, in three sizes.
Video released by the Vatican over the weekend showed the installation of a pair of stoves inside the chapel. One is used to burn the cardinals' ballots after they are cast and the other to send up the smoke signal -- the one that alerts the world that a vote has been taken and whether there's a new pope.
Workers scaled the roof of the chapel Saturday to install the chimneys.
When cardinals elected Benedict in 2005, the white smoke signaling the decision came about six hours after an earlier, inconclusive vote, Lombardi said.
It took another 50 minutes for Benedict to dress, pray and finally appear on the balcony of St. Peter's, he said.
The longest conclave held since the turn of the 20th century lasted five days.
On Monday, cardinals held the last of several days of meetings, known as General Congregations, to discuss church affairs and get acquainted. Lombardi said 152 cardinals were on hand for the final meeting.
As well as getting to know their counterparts from around the world, the cardinals discussed the major issues facing the church, including its handling of allegations of child sex abuse by priests and a scandal over leaks from the Vatican last year that revealed claims of corruption, as well as the church's future direction.
Church rules prevent cardinals over the age of 80 from participating in the conclave but allow them to attend the meetings that precede the vote.
Who will be chosen?
Meanwhile, the Italian news media are full of speculation about which cardinal may win enough support from his counterparts to be elected, and what regional alliances are being formed.
According to CNN Vatican analyst John Allen, also a correspondent for the National Catholic Reporter, the race was wide open as the cardinals entered the conclave.
Unlike in 2005, when Benedict XVI was believed to be the favorite going into the election, no one has emerged as a clear frontrunner this time around, Allen said.
Some names have cropped up in media reports as possible contenders, however. They include Italy's Cardinal Angelo Scola; Brazil's Odilo Scherer; Marc Ouellet of Quebec, Canada; U.S. cardinals Sean O'Malley of Boston and Timothy Dolan of New York; and Ghana's Peter Turkson.
More than 80% of Africans believe their continent is ready for an African pope, but only 61% believe the world is, an exclusive survey for CNN has found.
A mobile phone survey of 20,000 Africans from 11 nations, conducted by CNN in conjunction with crowd sourcing company Jana, found that 86% thought an African pope would increase support for Catholicism in Africa.
Italy potentially wields the most power within the conclave, with 28 of the 115 votes, making it the largest bloc in the College of Cardinals. The United States is second with 11. Altogether, 48 countries are represented among the cardinal-electors.
"Many would say it's all about politics at this point," Monsignor Rick Hilgartner, head of U.S. Conference of Catholic Bishops Secretariat on Divine Worship, told CNN, "but I think it's important to remember that they also recognize that this is a very spiritual moment."
Once the doors close and the conclave begins, he says, it's less about politicking and "more about prayer as they each in silence write their votes."
Sixty-seven of the cardinal-electors were appointed by Benedict, who stepped down at the end of last month, becoming the first pontiff to do so in six centuries.