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
========================================================================

Galvanized Sheet                                       Area of Connector
  Gauge No.                                                 Sq. In.
------------------------------------------------------------------------
     24                                                   less than 79
     22                                                   80 to 154
     20                                                   155 to 200
     16                                                   Over 200
========================================================================

  (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.