The INNOVAIR A5190 model is a 4-wire photoelectric detector board that provides reliable detection of smoke in ducts. This top-of-the-line product from System Sensor is brand new and comes in its original packaging. Ideal for business and industrial settings, this smoke detector is an essential component of any comprehensive fire safety plan. Its reliable performance and easy installation make it a popular choice among facility maintenance and safety professionals. Don't miss this opportunity to upgrade your fire protection system