* Up to 80% AFUE Rating* Aluminized Heat Exchanger: Resists corrosion and maintains long lasting performance.* Clamshell Heat Exchanger: Designed to provide quiet start-up and even temperatures.* Insulated Cabinet: Prevents loss of warm air while reducing the noise from the motor.* Anti-Vibration Blower Assembly: Reduces noise typically associated with starts and stops.* Sealed Blower Door: Reduces air noise.