Specifications include, but are not limited to: Work included under the Boiler House Stub Stack Design project consists of the removal of the existing boiler breeching systems, within the Boiler House, for boilers #1, #2, and #3, from the boiler outlets to the inside of the Boiler House exterior wall. New work includes supply and installation of pre-fabricated double wall stacks for boilers #1, #2, and #3, extending through the Boiler House roof. Stack components to be included are increasers, expansion joints, drain sections, stack caps, and roof support assemblies. Each stack will also require two (2) sets of test ports. New supplemental steel framing, within the Boiler House and at the roof, will be required to provide lateral support for the new stacks. Provide cutting and patching of the Boiler House roof related to penetration of the new stacks. as indicated.