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How does the double combustion of a wood stove work?

Here's how the double combustion of a non-catalytic wood stove works (EPA): 1. The pull generated by the chimney allows the intake of fresh air through the openings in the unit. 2. The primary supply of air injects oxygen onto the embers and wood. 3. This causes the fuel to burn, which releases gases and fine particles. 4. Secondary air introduces oxygen into the hot gases released by the first phase of combustion. 5. This causes a second combustion above the wood that burns almost all the fine particles and noxious gases before they are evacuated through the chimney.