This percentage rating indicates how effectively a furnace converts fuel into heat over the course of a year. The Condensation Process The transition to a secondary heat exchanger necessitates a change in the physical state of the exhaust byproduct.
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For example, a furnace with an 80% AFUE rating loses 20% of its energy through exhaust or other losses. Consequently, the exhaust that is vented outside is much cooler than that of a conventional furnace, often appearing as a white vapor.
Unlike older models that allowed heated air to escape up the flue, these modern systems capture and reuse heat that would otherwise be lost. This process of heat recovery is the fundamental principle that allows them to achieve efficiency ratings exceeding 90%.
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This PVC system is sealed, preventing backdrafts and ensuring that harmful gases are expelled efficiently without relying on the natural buoyancy of hot air. Primary and Secondary Heat Exchangers The most critical distinction between standard and high efficiency units lies in the heat exchange process.
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