You must install:     
       (1) Individual electric (plug-in or hardwire) or battery-operated carbon monoxide detectors that meet Underwriters Laboratories Inc. requirements (UL-Listed); or      
       (2) An electronic carbon monoxide detection system connected to an electronic alarm/smoke detection system that is UL-Listed.      
     Source Note:        The provisions of this §744.3753 adopted to be effective September 1, 2010, 35 TexReg 7469; transferred effective March 9, 2018, as published in the Texas Register February 16, 2018, 43 TexReg 909