Regulations of Connecticut State Agencies
(a) Installations existing on April 16, 1945. In buildings existing on April 16, 1945, every toilet-room or every water-closet or urinal compartment shall be ventilated to the outdoor air by window, skylight or ventilating duct.
(b) Installations installed after April 16, 1945. Every toilet-room or every water-closet or urinal compartment after April 16, 1945, shall have a window opening to the outer air, which shall be kept open, except where necessity requires the installation of such water-closet or urinal compartment in a basement, in which case a ventilating duct shall be provided.