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Tag: drains

Maintaining Your High Efficiency Furnace

Once furnaces reach 90{1c74626021d9c5a8d5059ea98d64b8f290317673ada7d772ef8a992974ff6973} AFUE or better, venting and combustion processes change considerably. High efficiency furnaces are direct-vent appliances, which means that both exhaust and intake air (combustion air) are piped directly to the outside. No indoor combustion air is utilized. The combustion chambers are sealed for better control of the combustion process.