Centralville lies across the Merrimack from downtown, reached by the Bridge Street crossings, and it holds some of the city's oldest dense housing. Two- and three-family buildings sit close to the lot lines, with narrow side yards and chimneys that have been through several fuel changes.
The tight spacing matters for venting. A sidewall termination that would be straightforward on a larger lot can be too close to a neighbour's window or a walkway here, and a chimney that once carried coal smoke may now serve a furnace and a water heater together. Both are checked before a repair is signed off.