[ccriders]

depending on the installation, squirrel-cage blowers push air well. propeller types pull better.

That's interesting. How can that be? Isn't it simply a matter of blade surface area, pitch and speed?
John

 

[ccriders]

Well,I studied the graphs and can say with authority there is one more thing I know I don't know (with apologies to Mr. Rumsfeld).
So why are cage fans not used to exhaust the engine room? Save on the electrical run, puts the fan where there is access, pushes out more air per watt and is quieter. (Did I read the graphs correctly?)
Thanks,
John