IPD engineered the steam boiler and hot water converter replacement for both boiler plants. Each new boiler plant received two high efficiency low mass natural gas fired boilers. New secondary hot water pumps were also equipped with variable speed drives and differential pressure control to reduce pumping energy and match water flow to building load. High efficiency boilers require dedicated combustion air intake and exhaust which is a challenge when replacing existing boilers. IPD designed the system to utilize the existing boiler stacks to route the new combustion air and intake vents through the existing chimney to their outlets at the second story roof, saving extensive work to create a new path for the venting. The exiting combustion air intakes where reduced to capacities required for summer ventilation only generating further energy savings. The new boilers were fully integrated into the exiting building management system to provide system monitoring and provide energy usage output. The project engineering and construction completed on time and in budget which was a major requirement for our client Cushman Wakefield Property Management making this a very successful project for the entire team.