Features: 80% AFUE Flame roll-out sensors standard Category I venting Blocked vent switch 24 VAC humidifier terminal Electronic air cleaner terminal Twinning furnaces of same heating and cooling sizes N8MSL model California NOx approved Certified 2% or less leakage of nominal air conditioning CFM delivered when pressurized to 1-¡inch water gauge with all present air inlets, air outlets, and condensate drain port(s) sealed TOUGHER PSC blower motor Adjustable heating blower OFF delay Factory set blower ON delay RPJ Aluminized steel heat exchanger High temperature limit control prevents overheating Direct ignition with Silicon Nitride ignitor One piece prepainted steel cabinet QUIETERIn-shot burnersEASIER TO INSTALL AND SERVICE 33-1/3' (847mm) high, for ease of installation Innovative knobs for easy door removal and secure attachment Factory shipped for natural gas, with propane gas conversion kits available Four position - upflow/downflow/horizontal (left/right) installation Three position inducer elbow capability Through the casing flue pipe for counterflow applications Common venting with other Category I appliances Masonry chimney adapter available Self diagnostics Slide out blower assembly WARRANTY * 20 year heat exchanger limited warranty with timely registration 5 year parts limited warranty With timely registration, an additional 5 year parts limited warranty * For owner-occupied residential applications only. See warranty certificate for complete details and restrictions, including warranty coverage for other applications.