NYC Laws & Codes
Article 3 - CHIMNEY CONNECTORS¶
Section 27-870¶
Section 27-870
§ 27-870 Chimney connector construction. Chimney connectors except
those serving incinerators shall be constructed of galvanized steel of
thickness conforming to the requirements listed in subdivision(a) of
this section or of equivalent materials. Cleanout doors of the same
material as the connector or other equivalent means shall be provided
for the cleaning of connectors. Tile pipe shall not be used as a chimney
connector.
(a) Thickness of metal. The thickness of galvanized steel for chimney
connectors shall be not less than that given in table 15-7.
Table 15-7 Required Thickness of Galvanized Steel for Connectors
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Galvanized Sheet Area of Connector
Gauge No. Sq. In.
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24 less than 79
22 80 to 154
20 155 to 200
16 Over 200
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(b) General. All chimney connectors shall be as short and as straight
as possible consistent with their use and the required draft conditions.
No chimney connector shall pass through a floor or ceiling construction.
Section 27-871¶
Section 27-871
§ 27-871 Chimney connection. In entering a flue in a masonry or metal
chimney, the chimney connector shall be installed above the extreme
bottom to avoid stoppage and in such manner or by such means as to
prevent the chimney connector from entering so far as to restrict the
space between its end and the opposite wall of the chimney. The chimney
connector shall be firmly attached or inserted into a thimble or slip
joint to prevent it from falling out of place. All connectors shall fit
tightly. Chimney connections to any flue shall be limited to one floor.
Two or more chimney connectors may be joined to a single connection
provided that the chimney connectors are on one floor level and the flue
is of sufficient size to serve all of the equipment thus connected.
Chimney connectors shall be inspected at the time of the initial
installation by the commissioner or by a duly authorized insurance
company as provided in section two hundred four of the labor law.
Section 27-872¶
Section 27-872
§ 27-872 Chimney connector clearances. (a) From combustible
construction. The minimum distance between the chimney connector and any
combustible material or construction shall be:
(1) eighteen inches for chimney connectors from low temperature
equipment.
(2) thirty-six inches for chimney connectors from medium temperature
and high temperature equipment.
(b) Reduced clearances. The above clearances may be reduced as
outlined in table 15-8 in accordance with the type of protection applied
to the combustible material or construction.
TABLE 15-8 REDUCED CLEARANCES FOR
CHIMNEY CONNECTORS WITH
SPECIFIED FORM OF PROTECTION (1,2,3,4)
Where the required clearance
Type of Protection with no protection is:
Applied to the combustible material 36 in. 18 in. 9 in. 6 in.
and covering all surfaces within
the distance specified as the required
clearance with no protection.
Thicknesses are minimum.
(a) 0.027 in. (23 gauge) sheet
metal spaced out 1 in. 18 in. 9 in. 4 in. 2 in.
(b) 3 1/2 in. thick masonry wall
spaced out 1 in. and adequately tied
to the wall being protected. 18 in. 9 in. 4 in. 2 in.
(See Note 4.)
(c) 0.027 in. (23 gauge) sheet
metal on 1 in. mineral wool batts
reinforced with wire or equivalent
spaced out in 1 in. 12 in. 3 in. 2 in. 2 in.
Notes:
1. Spacers and ties shall be of noncombustible material.
2. All methods of protection require adequate ventilation between
protective material and adjacent combustible walls and ceilings.
3. Mineral wool batts (blanket or board) shall have a minimum density
of 8 lb. per cu. ft. and a minimum melting point of 1500°F.
4. If a single wall connector passes through the masonry wall there
shall be at least 1/2 in. open ventilated airspace between the connector
and the masonry.
Section 27-873¶
Section 27-873
§ 27-873 Underground chimney connectors. Underground chimney
connectors shall be covered with at least twelve inches of solid masonry
or an equivalent insulation. Each cleanout opening shall be provided
with double iron doors or covers, and the doors or covers shall be
twelve inches apart with the intervening space filled with insulating
material. The doors or covers shall be not less than 10 manufacturers
standard gauge. No combustible flooring shall be permitted over such
connectors.
Section 27-874¶
Section 27-874
§ 27-874 Annual inspection of chimney connectors. Chimney connectors
for boilers subject to section two hundred four of the labor law shall
be inspected at least once a year by the commissioner or by a duly
authorized insurance company, as provided in subdivision (b) of section
27-793 of article two of subchapter fourteen of this chapter and shall
be subject to procedures listed therein.