Top-Vent and Direct-Vent Counterflow Furnaces • 115V Matchless piezo ignition 24V wall thermostat included Optional extension, vent, and outlet kits sold separately76% AFUE wall furnaces circulate warm air at floor level. Front panels remove easily for cleaning and servicing. Corrosion-resistant powder-coated finish. CSA Certified. Combustion chamber is warranted for 10 yr.