Maple Chase Company, of Plain City, Ohio voluntarily recalled about 280,000 FireX Branded 10000 Series Carbon Monoxide (CO) Alarms and 12000 Series CO/Smoke Combo Alarms. The recalled alarms can sound a "double chirp"/fault alarm in the presence of CO, prior to going20into full alarm. Upon hearing a double chirp, the Owner's Manual instructions recommend a consumer take the alarm out of service, which could expose consumers to hazardous levels of CO and suffer injury or death. The recall includes FireX branded 10000 and 12000 series alarms with item numbers: 10000, 12000, 12000C, 12000-6, 12200, 12220, 12400, 12400C manufactured between June 1, 2007 and February 1, 2008. The date code appears on the back of the unit with a four digit year, three digit month followed by the day (ex: 2007JUN1 for June 1, 2007). Units with a manufacture date code prior to June 1, 2007 are not included in this recall. These products were sold at commercial electrical distributors and electrical contractors and builders for installation into new home construction. A limited number of units were sold at Menard's nationwide from June 2007 through February 2008 for about $20 (10000 series) and $30 (12000 series).