On short notice, Miller came out and surveyed my project and determined what needed to be done. Gave a reasonable quote and then on the day needed, came and did the work. They installed a new B vent for a furnace by installing a flexible liner in the old chimney and providing the flashing and cap at the roof. Since the old vent wasn't to code, they installed the vent from the furnace all the way to the cap on the roof. Job well done.