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post #2 of (permalink) Old 08-16-2013, 11:13 PM
hammong
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Your analysis of the two fan types is essentially correct, that the profile of the blades are more "parallel" to the face of the fan, e.g. have a reduced pitch. The part where your logic fails is that the static pressure fans also have less gap between the blades. If viewed axially, you will see that eh SP blades almost meet - and that's the secret to increase static pressure. The air cannot weave it's way back past the next blade as easily as it would if there was a larger gap between the blades.

For high resistance situations, like blowing air through a radiator, the SP blades are superior. The evidence is widely documented.

Greg

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