Substitute the following wording for the requirements in IFGC section 621: Portable or permanently installed, gas-fired, unvented heating appliances may not be installed, except during construction or demolition of a building if the appliances are provided in accordance with ch. SPS 314.
Wis. Admin. Code Department of Safety and Professional Services § SPS 365.0621
See s. SPS 364.0801(2) for use of portable unvented heating appliances that are fired with other fuels.