Section 479.297 - Ionization smoke alarms; required equipment; exemptions(1) All ionization smoke alarms sold in this state that are solely battery-operated shall be packaged with a 10-year battery.(2) All ionization smoke alarms sold in this state shall include a "hush" mechanism that allows a person to temporarily disengage the alarm for a period of not more than 15 minutes.(3) The provisions of this section do not apply to:(a) Smoke alarms specifically designed for persons who are hard of hearing;(b) Smoke alarms sold in this state for shipment out of state; or(c) Smoke alarms sold for installation in recreational vehicles, commercial vehicles, railroad equipment, aircraft, marine vessels or manufactured dwellings.(4) The sale of a recreational vehicle, commercial vehicle, railroad equipment, aircraft, marine vessel or new manufactured dwelling containing a smoke alarm does not constitute sale of a smoke alarm. 1997 c.647 §2,3; 1999 c.307 §12; 2007 c. 70, § 274