Quiet, Efficient Comfort You Can Count On Bryant's Plus 90(model 350MAV) keeps your home warm and comfortable with up to 95.5% AFUE (Annual Fuel Utilization Efficiency). That's an improvement of almost 30% over typical older furnaces. Our primary heat exchanger transfers 80% of the available heat into your home. Although this is where most furnaces stop, Bryant's patented secondary heat exchanger transfers an additional 11-15% of the available heat into your home for money savings, energy efficiency and comfort.  1. Primary Three-pass Heat Exchanger Maximizes heat transfer with unique S-shaped design. This component is backed by a lifetime limited warranty. 2. Secondary Condensing Heat Exchanger Extends heat transfer for higher efficiency. It is protected by our patented Everlastic™ coating for long-lasting durability. This component is backed by our lifetime limited warranty. 3. Sealed Combustion System Eliminates drafts and allows quiet operation by using outdoor air for combustion. 4. High-Efficiency Blower Features a direct-drive motor that operates with precision to deliver quiet, dependable heating. 5. Control Center Safely monitors furnace operation for peak performance and efficiency.