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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.
The only difference between an intake and exhaust fan is the direction you install it in the case. If you look closely on the fan shroud (the part around the fan itself) you should notice an arrow on it which shows airflow direction.ans generally can be used for both intake and exhaust. Now, your fans will have a CFM rating which is how much air they move per minute, higher is obviously more, there are two schools of thought on airflow.