Vt. Residential Rental Housing Health & Safety Code (adopted under 18 V.S.A. ch. 172 / 20 V.S.A. ch. 172)

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8 - Natural and Mechanical Ventilation
8.1 To ensure the health and safety of the occupants, the owner of residential rental
dwelling units and rooming houses shall provide ventilation to the outdoors as
follows, so as to not endanger the health and safety of the occupants:
8.1.1 Every habitable room shall include at least one window or door in good
repair located on an outside wall that is capable of being opened to admit fresh
air.
8.1.2 Screens shall be provided for all operable windows and for doors that are
providing ventilation when a window is not available. All screens shall be
maintained in good repair and be free from tears, holes, or other imperfections
of either screen or frame that would admit insects such as flies or mosquitoes.
8.1.3 All hallways and stairways in common spaces shall be adequately
ventilated.
8.1.4 Every bath, toilet or shower room shall be ventilated by direct access with
the external air either by window, airshaft, or ventilation fan. If a ventilation fan
is used, it shall be vented directly to the exterior of the building and be of
sufficient size to prevent the buildup of moisture.
8.1.5 All clothing dryers shall be vented directly to the exterior of the building.
8.2 Use of vaporizers/humidifiers: Vaporizers/humidifiers shall not be used by
dwelling or rooming house occupants or owners in such ways that cause an
elevated relative humidity (Above 60%), promoting the growth of
microorganisms and visible mold.