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Boilers, boiler breeching, and boiler piping shall be isolated in accordance with the applicable requirements of Sections 313.3.1.1 and 313.3.1.2.
313.3.1.1 Boilers
All boilers supported on floors directly above a story having dwelling units shall be supported on resilient isolators having a minimum static deflection of 1 inch (25.4 mm). The isolators shall be installed directly under the structural frame of the boiler.
313.3.1.2 Boiler Breeching and Piping
When boilers are equipped with mechanical draft fans, the boiler breeching and piping that are supported from or on slabs, floors or walls that are contiguous to the dwelling unit shall be supported for a distance of 50 pipe diameters on or from resilient isolators. Each isolator shall have a minimum static deflection of 1 inch (25.4 mm).

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