Attention: Owners of Firex® products: The manufacturer of Firex® branded products was acquired by Kidde in 2009. Invensys Controls no longer manufactures or supports these products. This website may contain some historical support documents, such as product user guides that may reference the Invensys Controls name or mailing address for product support. Some of these documents are listed below to help support owners of these older products. Smoke and carbon monoxide alarms must be replaced within the specific lifetime of the product, usually 5 to 10 years after the date of manufacture.