80% ECM Single Stage Heating FurnaceEasier To Sell: 80% AFUE Supports two-stage cooling units Flame roll-out sensors standard Category I venting Blocked vent switch Dehumidification feature in cooling 24 VAC humidifier terminal Electronic air cleaner terminal N8MXL model California NOx approved Certified to leak 2 percent or less of nominal air conditioning CFM delivered when pressurized to 1-inch Water Gauge with allpresent air inlets, air outlets, and condensate drain port(s) sealed Tougher: ECM 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 Quieter: In-shot burners Insulated blower compartment Easier 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 propanegas conversion kits available Four position - upflow/downflow/horizontal (left/right) installation Three position vent elbow capability Through the casing flue pipe for counterflow applications Common venting with other Category I appliances Masonry chimney adapter available Self diagnosticsSlide out blower assembly Warranty:* 20 year heat exchanger limited warranty 10 year parts limited warranty with timely registration 5 year parts limited warranty if not registered within 90 days of original installation * For residential applications only. See warranty certificate for complete details and restrictions, including warranty coverage for other applications.