803.10.4.2 Field-applied insulation for chimney connectors.
MC § 803.10.4.2
Chimney connectors of appliances with flue gas temperatures less than 500°F (260°C) that pass through walls or partitions of combustible construction shall be insulated with a field-applied flexible wrap assembly tested in accordance with either ASTM E 2816 or ASTM E 2336. The connector shall comply with all of the following: 1. The insulated vent connectors pass-through assemblies and through penetration assemblies shall be tested for F and T ratings in accordance with ASTM E 814. The F and T rating of the assembly shall be equal to or exceed the fire-resistance rating of the mechanical/boiler room.
2.Bracing and supports shall be of noncombustible material securely attached to the structure and designed to carry gravity and seismic loads within the stress limitations of Chapter 16 of the New York City Building Code. Bolts, screws, rivets and other mechanical fasteners shall not penetrate connector walls.
3.Insulated vent connector pass-through assemblies shall not pass through ceilings or floors.
4.Insulated vent connector pass-through assemblies shall not run through occupied spaces, corridors, sleeping rooms and spaces with hazardous materials.
5.Insulated vent connector pass-through assemblies material shall meet the requirements for minimum chimney connector thicknesses for medium and high-heat appliances in accordance with Table 803.9(2).
6.Insulated vent connector pass-through assemblies fittings shall be welded or shall be factory fabricated UL listed construction suitable for external flexible wrap insulation.
7.The draft calculations shall account for the insulating value of the field-applied flexible wrap insulation.
