Aprilaire Aprilaire 4670 HUMIDIFIER MOTOR MSRP: Price: 2099-12-31 $150.72 HUMIDIFIER MOTORAprilaire humidifier replacement motor. Humidifier motor must be used in conjunction with Aprilaire 4670 humidifier.Aprilaire 4670 humidifier replacement motor.The Aprilaire 4670... Add to Cart Add to Cart