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From the 2009 International Residential Code unless otherwise indicated.
For new construction, an approved carbon monoxide alarm shall be installed outside of each separate sleeping area in the immediate vicinity of the bedrooms in dwelling units within which fuel-fired appliances are installed - and in dwelling units that have attached garages.
Where work requiring a permit occurs in existing dwellings that have attached garages or in existing dwellings within which fuel-fired appliances exist, carbon monoxide alarms shall be provided in accordance with Section R315.1.
Single station carbon monoxide alarms shall be listed as complying with UL 2034 and shall be installed in accordance with this code and the manufacturer's installation instructions.
State law, HB09-1091, requires owners of dwelling units with either attached garages or fuel-fired appliances to install carbon monoxide alarms when the home undergoes "interior alterations, repairs, fuel-fired appliance replacement, or additions, any of which require a building permit."
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