Reliable Comfort, Perfect Fit Every home is different. Fortunately, Bryant accounts for these differences by offering the 383KAV upflow and the 373LAV for downflow or horizontal use. Your Bryant dealer will help you determine which model is right for your home. 1. Hot Surface Ignition Has a solid surface which does not flutter or blow out. Adds reliability and energy savings. 2. Four-PassTM Heat Exchanger Saves energy through superior heat transfer. Constructed of aluminized steel with crimped seams for corrosion resistance and enhanced reliability. Backed by a twenty-year limited warranty. 3. Inducer Assembly Reduces noises with a vibration-absorbing mounting assembly. The inducer enhances efficiency by drawing the exact amount of air needed through the heat exchanger. 4. Electronic Control Minimizes cold drafts with it's blower delay. Electronic air cleanser and humidifier connections allow for easy hook-up of a total indoor comfort system. 5. Added Safety Is provided by Bryant's exclusive blocked vent safe-guard protection. It shuts down furnace operation if a common vent is obstructed. That means your family is protected from harmful flue gases that could escape into your living area.