Corrosion-resistant, aluminized-steel tubular heat exchangerEnergy-saving, reliable hot surface ignition system with patented adaptive learning algorithmAluminized steel inshot burnersEnergy-saving PSC, multi-speed, direct drive blower motorQuiet, corrosion-resistant induced draft blower assemblyIntegrated furnace control with diagnosticsLow voltage terminal blocksMultiple flame roll-out switches, blower door safety switch, outlet air-limit switch and pressure switch for proof of combustion air4