The NCHC42BT5S is a 3.5-ton evaporator coil engineered for reliable performance with R-454B refrigerant and featuring a factory-installed refrigerant detection system sensor. Built with durable aluminum alloy tube and fin construction tested through 500 hours of salt spray, this coil delivers dependable operation in diverse climates. Pre-formed flanges align with matching furnaces for streamlined installation, while longer service valve connections accommodate both mechanical and brazed methods. An antimicrobial drain pan helps prevent mold and mildew, and the unit is backed by a ten-year limited warranty when registered.