Heavy-duty aluminized-steel tubular heat exchanger
	
Stainless-steel secondary
	heat exchanger
	
Single-stage gas valve
	
Durable silicon nitride igniter
	
Quiet single-speed induced
	draft blower
	
Self-diagnostic control board with constant memory fault code history output to a LED
	
Color-coded low-voltage terminals with provisions for air cleaner and humidifier
	
Cabinet air leakage (QLeak) = <2%
	
All models comply with California 40 ng/J Low NOx emissions standards