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combustion - ✔✔the process by which a fuel is ignited in
the presence of oxygen
condensing furnace - ✔✔a furnace that contains a
secondary heat exchanger that extracts latent heat by
condensing exhaust gases
heat exchanger - ✔✔A device that is used to transfer heat
from a warm surface to a cooler surface
hot surface igniter - ✔✔a ceramic devise that glows when
an electrical current flows through it. used to ignite the
fuel/air mix
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