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"air flow" fans are the "opposite", usually theres AF vs SP in the product nameJust wondering if there is a fan design that is more optimally suited to exhausting air rather than pushing air? Kind of like the opposite of static pressure?
A fan doesn't know whether it's pushing air into a volume or pulling it out. A fan just creates a pressure differential; in conjunction with any existing pressure difference, such as one created by an intake fan, the differential results in airflow. Some fans are better suited to moving the most air across a small differential, that's an "airflow" or free flow fan. Some are better at dealing with larger differentials without stalling, that's the static pressure fan.Just wondering if there is a fan design that is more optimally suited to exhausting air rather than pushing air? Kind of like the opposite of static pressure?
yes and yes, depending on the case. if its exhaust spot has a lot of material to move through a sp is best, if its wide open af is best. sp helps move the air through restrictions, af moves more air.Some fans, like the Noiseblocker NB eLoop create channels of air, whereas others spread the air out more. I wonder if that is the difference between static pressure and air flow fans, and whether either is more suited to being an exhaust fan?
Not really, because exhaust fans generally aren't fighting to move air through/past anything (case exhausts specifically, not talking about pull fans on sinks/rads). Case intake fans need to have decent pressure so that they can pull air through filters/mesh/etc (unless you run an unfiltered or an open case), which is something exhausts don't have to do, so they don't have to have particularly great pressure performance, just mass airflow capability.
We need to keep in mind that airflow is like water flow. (Science of airflow is named Fluid Dynamics,) Think of our case as a box in a pond of water with holes cut in box (vents) for propellers (fans) it might help. For a propeller to flow any water into box the box has to be flowing the same amount of water out another hole.Aren't exhaust fans moving/pushing air through/past the back grill?
We need to keep in mind that airflow is like water flow. (Science of airflow is named Fluid Dynamics,) Think of our case as a box in a pond of water with holes cut in box (vents) for propellers (fans) it might help. For a propeller to flow any water into box the box has to be flowing the same amount of water out another hole.
Airflow optimized is probably the better choice. The rear grille doesn't impede the airflow to any noticeable extent; it's not like trying to push air through a dense radiator.That doesn't answer my question about the back grill. Should I have a SP fan or an AF fan as the exhaust fan?
You will need the same airflow regardless ... If you are only putting in say 100 CFM through the front, but the back is 120 CFM , that back fan is getting the air from somewhere. All fans experience static pressure (ESP), and there is no "free lunch". So if you are putting a different fan in the rear you should keep in mind that it will experience pressure regardless.That doesn't answer my question about the back grill. Should I have a SP fan or an AF fan as the exhaust fan?
Unless there's an airflow restriction, such as a radiator or a crappy closed-off front panel design, yes, an airflow-optimized fan is probably preferred.Are front intake fans usually air flow fans?
"SP fans" and "AF fans" are snake oil advertising terminology. All fans have "static pressure" and "airflow" ratings.That doesn't answer my question about the back grill. Should I have a SP fan or an AF fan as the exhaust fan?