Section SPS 323.15 - Chimney connectors, smoke pipes and stovepipes(1) DEFINITION. Chimney connectors, smoke pipes or stovepipes are passages for conducting the products of combustion from a fuel-fired appliance to the chimney.(2) CONSTRUCTION AND INSTALLATION. The construction and installation of chimney connectors of solid-fuel-burning appliances shall comply with s. SPS 323.045(4). The chimney connectors of all other fuel-fired appliances shall conform with the following requirements: (a)Concealed space. No chimney connector shall pass through any outside window, door or combustible outside wall, nor be concealed in any closet, attic or similar space.(b)Combustible partitions. Connectors for appliances shall not pass through walls or partitions constructed of combustible material unless they are guarded at the point of passage by: 1. Metal ventilated thimbles not less than 12 inches larger in diameter than the connector;2. Metal or burned fireclay thimbles built in brickwork or other approved fireproofing materials extending not less than 8 inches beyond all sides of the thimble.(c)Pitch and length. Chimney or vent connectors shall have no more than two 45° offsets with the vertical. The horizontal length shall not exceed 75% of the total vertical height of the total venting system measured from the appliance outlet. Chimney or vent connectors shall be pitched at least 1/4-inch per foot from the appliance outlet collar vent to the chimney inlet.(d)Dampers.1. Manually operated dampers are prohibited in chimney or vent connectors of all appliances except wood-burning appliances.2. A listed, automatically operated damper may be used with any heating appliance provided it is installed and used in accordance with the appliance and damper listing.(e)Materials and thickness. Chimney or vent connectors serving liquid fuel or gas appliances shall conform to the type of material and thickness indicated in Table 323.15-A or 323.15-B.(f)Clearance. Single wall metal connectors shall be installed with clearance to combustibles as indicated in Table 323.15-C. These clearances may be reduced if the combustible material is protected in accordance with the requirements of Table 323.04-B. TABLE 323.15-A
MINIMUM CHIMNEY CONNECTOR GAUGES FOR OIL-FIRED APPLIANCES
Diameter of Connector | Galvanized Steel Gauge Min. thickness (inch) | Number Gauge |
Less than 6 inches | .019 | 26 |
6 inches to less than 10 inches | .024 | 24 |
10 inches to 13 inches | .030 | 22 |
14 inches to 16 inches | .036 | 20 |
Greater than 16 inches | .058 | 16 |
TABLE 323.15-B
MINIMUM VENT CONNECTOR GAUGES FOR GAS
Galvanized Steel Gauge Number |
Diameter of Connector | Min. thickness (inch) | Gauge |
1 inch through 4 inches | .016 | 28 |
5 inches or over | .026 | 24 |
TABLE 323.15-C
CHIMNEY CONNECTOR AND VENT CONNECTOR CLEARANCES FROM COMBUSTIBLE MATERIALS (See Note 4) -
Description of Appliance | Minimum Clearance Inches (See Note 1) |
Single-Wall Metal Pipe Connectors |
Gas Appliances Without Draft Hoods | 18 |
Electric, Gas, and Oil Incinerators | 18 |
Oil Appliances | 18 |
Unlisted Gas Appliances With Draft Hoods | 9 |
Boilers and Furnaces Equipped With Listed Gas Burners and With Draft Hoods | 9 |
Oil Appliances Listed as Suitable for Use With Type L Venting Systems, but only when connected to chimneys | 9 |
Listed Gas Appliances With Draft Hoods. See Note 3. | 6 |
Type L Vent Piping Connectors |
Gas Appliances Without Draft Hoods | 9 |
Electric, Gas, and Oil Incinerators | 9 |
Oil Appliances | 9 |
Unlisted Gas Appliances With Draft Hoods | 6 |
Boilers and Furnaces Equipped With Listed Gas Burners and With Draft Hoods | 6 |
Oil Appliances Listed as Suitable for Use with Type L Vents | (See Note 2) |
Listed Gas Appliances With Draft Hoods | (See Note 3) |
Type B Gas Vent Piping Connectors |
Listed Gas Appliances With Draft Hoods | (See Note 3) |
1 These clearances apply except if the listing of an appliance specifies different clearance, in which case the listed clearance takes precedence.
2 If listed type L venting system piping is used, the clearance may be in accordance with the venting system listing.
3 If listed type B or type L venting system piping is used, the clearance may be in accordance with the venting system listing.
4 The clearances from connectors to combustible materials may be reduced if the combustible material is protected in accordance with Table 323.04-B.
Wis. Admin. Code Department of Safety and Professional Services SPS 323.15
Cr. Register, November, 1979, No. 287, eff. 6-1-80; am. (2) (intro.) and (g), Tables 23.15 -A and C, renum. (2) (d) to be ILHR 23.155, Register, January, 1989, No. 397, eff. 2-1-89; r. (2) (c) and (f), renum. (2) (e), (g) and (h) to be (2) (c), (e) and (f), cr. (2) (d), Register, March, 1992, No. 435, eff. 4-1-92; r. and recr. (2) (d), Register, January, 1999, No. 517, eff. 2-1-99; correction in (2) (intro.), (e), (f), Table 323.15-C made under s. 13.92(4) (b) 7, Stats., Register December 2011 No. 672.