Sometime in late August, Jen and Nic Welty, who own 9 Bean Rows bakery on M-204 between Lake Leelanau and Suttons Bay, will use their new, state-of-the-art, wood-fired clay convection oven for the first time. The oven, which measures 12 feet in diameter, occupies 144 square feet, weighs 70,000 pounds, and emits exceptional radiant heat, was built on-site by a team of four Barcelonians during one week in mid-July.