Section SPS 323.155 - Multiple appliance ventingTwo or more listed gas-or liquid-fueled appliances may be connected to a common gravity-type flue provided the appliances are equipped with listed primary safety controls and listed shutoff devices and comply with the following requirements.
(1) The appliances shall be located in the same story, except for engineered venting systems.(2) The appliances shall be joined at a manifold or Y-type fitting as close to the chimney as possible, unless the connector from each appliance enters a separate chimney inlet and the inlets are offset at least 12 inches vertically or the separate inlets occur at right angles to each other.(3) The chimney connector and chimney flue shall be sized to accommodate the total volume of flue gases. For gas-burning appliances the venting area shall be at least equal to the size of the largest vent connectors plus at least 50% of the area of the other vent connectors.Wis. Admin. Code Department of Safety and Professional Services SPS 323.155
Renum. from ILHR 23.15 (2) (d) and am. Register, January, 1989, No. 397, eff 2-1-89; r. (2), renum. (1) (intro.), (a) to (c) to be (intro.), (1) to (3), Register, March, 1992, No. 435, eff. 4-1-92.