"The CPSC recommends that consumers purchase and install carbon monoxide detectors with labels showing they meet the requirements of the new UL standard 2034. The CPSC also recommends that every home have at least one carbon monoxide detector for each floor of the home, while UL recommends placing carbon monoxide detectors within hearing range of each sleeping area. Additionally, UL recommends placement near, but not directly above, combustion appliances such as furnaces and water heat- ers, near fire places or in the garage. UL also discourages placement of detectors within five feet of kitchen stoves and ovens, or near areas where household chemicals and bleach are stored. Detectors may be placed near the floor or near the ceiling since carbon monoxide has nearly the same density as air.
Legislated detector requirements
In North America, some national, state and local municipalities require installation of CO detectors in new and existing homes as well as commercial businesses, among them Illinois, Massachusetts, Minnesota, New Jersey, Vermont and New York City as well as the Canadian province of Ontario. Installers are encouraged to check with their local municipality to determine what specific requirements have been enacted in their jurisdiction."
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contact the borough construction department for the exact location they want you to place the unit(s). As far as my experience goes, they will want it not near the heater but near the sleeping areas.