The Armstrong LUF80 is a discontinued variable-speed, oil-fired furnace with an efficiency of up to 83.0% AFUE. The variable-speed motor featured a "soft start" and "soft stop", which combined with a balanced blower wheel and strong motor mounts to provide smooth, quiet operation. The heat exchanger was made of heavy duty 14 gauge steel, and a high temperature ceramic fiber combustion chamber with stainless steel cleanout ports provided easy cleaning access. The LUF80 used a Beckett burner with a solid state ignition and a PSC burner motor for reduced power consumption and smooth operation.
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