Oregon Revised Statutes Property Rights and Transactions § 105.838

(1) A person may not convey fee title to a one and two family dwelling or multifamily housing that contains a carbon monoxide source, or transfer possession under a land sale contract of a one and two family dwelling or multifamily housing that contains a carbon monoxide source, unless one or more properly functioning carbon monoxide alarms are installed in the dwelling or housing at locations that provide carbon monoxide detection for all sleeping areas of the dwelling or housing.

(2) A carbon monoxide alarm in a one and two family dwelling or multifamily housing described in subsection (1) of this section must be installed in conformance with applicable rules of the State Fire Marshal and in conformance with any applicable requirements of the state building code.

(3) Violation of this section or a rule adopted by the State Fire Marshal does not invalidate any sale or transfer of possession of a one and two family dwelling or multifamily housing.