Physics Question

[mark]

I can tell you for sure after I look over a doc at work (brain trust back National hired a Engineer and one of the things they had him studying was having a muffin fan blowing in, or the fan blowing out). Might as well get some of your tax money back.

Personally from looking at the fans I have around the tank/sump, probably better blowing in, rather than having the moist salt air being drawn past the fan. Hey, might be the difference of a fan lasting 5 years rather than 3.