Worry-Free Comfort And Long-Lasting Value The Model 393AAV with components that are designed to offer dependable, long-lasting comfort. Bryant's exclusive blocked vent safeguard shuts down furnace operation if a dedicated or shared vent is blocked. This protects your family from any harmful flue gases that could escape into your living area. The hot surface ignition starts this unit quickly and reliably, adding to the efficiency and safety of this gas furnace. The heat exchanger maximizes heat transfer and resists corrosion so you can enjoy consistent, energy-efficient comfort season after season  1. Precision Comfort Of the combustion blower pulls the exact amount of air needed through the heat exchanger for efficient heat transfer. The rubber mounted assembly and smaller wheel help ensure quiet, reliable operation 2. Reliable And Efficient Start-Up From the hot surface ignition eliminates a wasteful pilot and saves energy. 3. Maximum Heat Transfer Is provided by the four-pass heat exchanger. The durable, aluminized steel construction offers years of worry-free comfort. 4. Low Installation Costs Save money because of special vent kit, which may allow the furnace to be vented directly into an existing masonry chimney. 5. Comfort And Reliability Is enhanced by the control center. This highly reliable component constantly monitors furnace operations for peak performance. 6. Added Safety Is provided by Bryant's exclusive blocked vent safe-guard protection. It shuts down furnace operation if a vent is obstructed. That means your family is protected from harmful flue gases that could escape into your living area.