ATCP 73.145(2)(a)(a) “Carbon monoxide detector” means an electronic or battery-operated device that sounds an alarm when an unsafe level of carbon monoxide is in the air. A carbon monoxide detector is referred to as a “carbon monoxide alarm” by the Underwriters Laboratories, Inc., standards and ss. SPS 320.24 (2), 321.097 and 362.0915. ATCP 73.145(2)(b)(b) “Fuel-burning appliance” means a device that is used or intended to be used in a residential building and burns fossil fuel or carbon based fuel where carbon monoxide is a combustion by-product. “Fuel-burning appliance” includes stoves, ovens, grills, clothes dryers, furnaces, boilers, water heaters, heaters, and fireplaces. ATCP 73.145(2)(c)(c) “Inspection agent” means an individual holding certification under s. SPS 305.71 as an HVAC qualifier, who has been retained by the department or its agent to conduct the inspections of sealed combustion units required under this section and ss. 101.149 (5) (c) and 97.625 (1) (am), Stats. ATCP 73.145 NoteNote: Sections 97.625 (1) (am) and 101.149 (5) (c), Stats., were repealed by 2017 a. 330. ATCP 73.145(2)(d)(d) “Listed” means equipment that is tested by an independent testing agency and accepted by the department of safety and professional services. ATCP 73.145(2)(f)(f) “Sealed combustion appliance” means a listed fuel-burning appliance that acquires all air for combustion through a dedicated sealed passage from the outside to a sealed combustion chamber and for which all combustion products are vented to the outside through a separate dedicated sealed vent. ATCP 73.145(2)(g)(g) “Sleeping area” means the area of the unit in which the bedrooms or sleeping rooms are located. Bedrooms or sleeping rooms separated by another use area such as a kitchen or living room are separate sleeping areas but bedrooms or sleeping rooms separated by a bathroom are not separate sleeping areas. ATCP 73.145(2)(h)(h) “Unit” means a part of a residential building that is offered for pay as a sleeping place or sleeping accommodations to an individual or a group of individuals maintaining a common household to the exclusion of others. Every room or set of rooms that is rented out separately is a “unit.” ATCP 73.145(3)(a)(a) Except as provided in par. (b) or in sub. (6), the operator shall install a carbon monoxide detector in each residential building in all of the following places not later than the date specified under par. (c): ATCP 73.145(3)(a)1.1. In the basement of the building if the basement has a fuel-burning appliance. ATCP 73.145(3)(a)2.2. Within 15 feet of each sleeping area of a unit that has a fuel-burning appliance. ATCP 73.145(3)(a)3.3. Within 15 feet of each sleeping area of a unit that is immediately adjacent to a unit, located on the same floor level, that has a fuel-burning appliance. ATCP 73.145(3)(a)4.4. In each room that has a fuel-burning appliance and that is not used as a sleeping area, not more than 75 feet from the fuel-burning appliance. ATCP 73.145(3)(a)5.5. In each hallway leading from a unit that has a fuel-burning appliance, in a location that is within 75 feet from the unit, measured from the door of the unit along the hallway leading from the unit, except that, if there is no electrical outlet within this distance, the operator shall place the carbon monoxide detector at the closest available electrical outlet in the hallway. ATCP 73.145(3)(b)(b) If a unit is not part of a multiunit building, the operator need not install more than one carbon monoxide detector in the unit. ATCP 73.145(3)(c)1.1. Except as provided under subd. 2., the operator shall comply with the requirements of this subsection before a residential building is occupied. ATCP 73.145(3)(c)2.2. The operator shall comply with the requirements of this subsection not later than April 1, 2010, if construction of the residential building was initiated before October 1, 2008, or if the department of safety and professional services approved the plans for the construction of the building under s. 101.12, Stats., before October 1, 2008. ATCP 73.145(3)(d)(d) A carbon monoxide detector shall conform to UL 2034 and shall be listed and labeled identifying conformance to UL 2034. Carbon monoxide detectors and sensors as part of a gas detection or emergency signaling system shall conform to UL 2075 and shall be listed and labeled identifying conformance to UL 2075. ATCP 73.145(3)(e)(e) The operator shall install every carbon monoxide detector required under this section according to the directions and specifications of the manufacturer of the carbon monoxide detector. ATCP 73.145(4)(4) Maintenance requirements. The operator shall maintain carbon monoxide detectors in compliance with the requirements of s. 101.149 (3), Stats., as follows: ATCP 73.145(4)(a)(a) The operator shall reasonably maintain every carbon monoxide detector in the residential building in the manner specified in the instructions for the carbon monoxide detector. ATCP 73.145(4)(b)(b) An occupant of a unit in a residential building may give the operator written notice that a carbon monoxide detector in the residential building is not functional or has been removed by a person other than the occupant. The operator shall repair or replace the nonfunctional or missing carbon monoxide detector within 5 days after receipt of the notice. ATCP 73.145(5)(5) Tampering prohibited. Pursuant to s. 101.149 (4), Stats., no person may tamper with, remove, destroy, disconnect, or remove batteries from an installed carbon monoxide detector, except in the course of inspection, maintenance, or replacement of the detector. ATCP 73.145(6)(6) Exception to installation requirements. The installation of carbon monoxide detectors is not required in a residential building if construction of the building was initiated before October 1, 2008, or if the department of safety and professional services approved the plans for the construction of the building under s. 101.12, Stats., and s. SPS 361.30, provided the building does not have an attached garage and any one of the following circumstances applies: