Lennox HART-1445-26, 78UGF2(X)-50, 78UGF3(X)-50, 78UGF3(X)-75, 78UGF4(X)-75 Installer's Manual
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Lennox HART-1445-26, 78UGF2(X)-50, 78UGF3(X)-50, 78UGF3(X)-75, 78UGF4(X)-75, 78UGF4(X)-100, 78UGF6(X)-100, 78UGF4(X)-125, 78UGF6-125, 78UGF6-150 Installer's Manual
