(a) Where a stove is to be vented into a chimney flue by a chimney connector, the connector shall be of corrosion-resistent steel of a thickness not less than shown in Table 3.
TABLE 3
Stove Connectors
Galvanized Sheet Metal (Gage No.) | Diameter of Connector (inches) |
26 | Less than 6 |
24 | 6 to less than 10 |
22 | 10 to 12 |
20 | 14 to (but not including) 16 |
16 | 16 |
A stove chimney connector shall not be connected to a flue serving a fireplace. A fireplace shall have its own individual flue.
(b) Clearance of a Chimney Connector. The clearance of a chimney connector shall be not less than eighteen inches from the nearest combustible material. Where the combustible material is protected the clearance may be reduced to that indicated in Table 2 and Figure 1.
(c) Connection of a Connector to a Chimney Through Walls. The two acceptable methods of connecting a chimney connector to a chimney flue where the connector must pass through a combustible partition wall shall be in accordance with Figure 2. Clearance shall be three times the diameter of the stovepipe.
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Reproduced with permission from NFPA No. 119 B Using Coal and Woodstoves Safety 1974, National Fire Protection Association, 470 Atlanta Avenue, Boston, Mass.
(d) Installation of Connectors.
(1) The connector pipe shall be as short as possible. It shall be no longer than seventy-five percent (75%) of the vertical chimney height above the flue inlet.
(2) The smoke pipe shall be straight as well as short. No more than two right-angle bends shall be used in a connector pipe.
(3) The connector pipe diameter shall be as large as the flue collar.
(4) The pipe's horizontal section shall rise one-fourth inch for each foot of pipe, with the highest point being at the chimney inlet.
(5) When joining sections of pipe, the joints shall be overlapped by at least two inches, with the crimped (male) end pointing down. Each joint shall be secured with at least three sheet metal screws.
(6) A ventilating thimble shall be used.
(7) A smoke pipe unless necessary shall not pass through an interior wall. If this must be done, a ventilating thimble shall be used. The thimble diameter shall be at least twelve inches larger than that of the smoke pipe, to provide for at least six inches of metal-lined ventilated clearance.
(8) A connector pipe shall not pass through an exterior wall.
(9) A smoke pipe shall not pass through any closets.
(e) Two or More Connectors to One Chimney. There shall be only one connector to each chimney for each woodstove.
(Ord. 1984-17. Passed 5-15-84.)