Re: Power supply fan airflow direction

w_tom wrote:

> Before anyone can make an accurate conclusion, you must
> first supply basic facts. 80 mm Papst fan that only does 12
> dB noise has minimal CFM - only about 20. Without fundamental
> numbers, then every response is simply speculation. To
> determine what is and is not sufficient airflow for a chassis
> requires such basic facts such as fan's CFM, watts consumed by
> system (which is be a number less than the power supply's
> rating), and other such data.
>
> Doing a rough calculation for a small system puts the fan on
> edge of acceptable. More than enough for a computer in a 70
> degree room. But your system must be sufficient for a 100
> degree F room. Most systems are sufficient with a 30 or 40
> CFM airflow. Yours is lower - unless of course that fan is
> not the 12 dB version.
>
> But we know this much. Responses are only speculation until
> you first provide some fundamental technical numbers. So far,
> insufficient data has been provided to properly answer
> original point of your original question. Is fan direction or
> CFM sufficient? We don't even know what the fan is? How can
> anyone properly answer such as question? Is power supply too
> hot? Your hand calls hot what a semiconductor calls
> paradise. How hot is hot - a number is required?

My simple question caused a lot of discussion, that what not my intention.
Answers like "depends on the system" or "It was attempted once, but not
continued, because ....." was what I was expecting. I don't need to know
how my system specificly would react to it. I would have tried it if that's
what I wanted to know.