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Diffuser (thermodynamics) A diffuser is a device for reducing the velocity and increasing the static pressure of a fluid passing through a systemâ. Diffusers are used to slow the fluid's velocity while increasing its static pressure. The fluid's static pressure rise as it passes though a duct is commonly referred to as pressure recovery.
2) An exhaust damper (a.k.a. flue, vent, or chimney) that exhausts gases and pulls in oxygen through the intake dampers. The intake damper is near the charcoal or wood and its job is to provide them with oxygen. The intake damper is the engine that drives the system.