Air Circulation

Hello all

The stand and canopy for a 225 gal both have 2 vent holes on each side panel. So in each piece are 2 intake vents side-by-side on the right and 2 exhaust vents on the left.

As I was busily installing fans into these holes, someone who works in the office comes up and gives me an informative lecture about the physics of intake and exhaust, and ultimately tells me to remove the intake fans (which are near an air conditioning vent in the ceiling), and simply let the exhaust pull the air all the way through the furniture. Supposedly, the intake just slows down the cooler air coming in and a pocket of hotter air will accumulate. He based this suggestion on his experience constructing computer systems and servers.

Has anyone experimented with this? Can you confirm the theory?

Thanks,
spiral

 

Yea that makes sense if your pushing in air faster then you are pulling it out you will have problems.By having one set of fans pulling air thruogh your hood this creates constant flow without any pockets of HOT air to accumulate.

on my sunpod for example there is only an exhaust fan for this very reason.

here you see the intake where they designed it so the air is drawn over the ballast

 

good times

 

Best way to do it is to have the fans blowing in, reason is that way the moisture isn't going through the fans. They will last longer that way. Very few fans are moisture resistant.

 

I could be wrong!

Hmm i'm not so sure , I hate to argue but seems to me the air might be blocked by reflectors and wiring and what ever else is in the hood, diffusing it.Wouldn't pulling the air through the hood create a vacuum of sorts and move air more efficiently? Besides wouldn't you get the same amount of moisture on the fans pulling/pushing air through said fixture? If any moisture at all for that matter.

I could be completely wrong and I'm going on theory, i have never DIY'd a hood, just looking mine over and the design seems sound. JMHO

 

The tank is just like the sea air as said before. The fans unless they are rated for wet environment will not last long.

 

Waterproof fans

I found this site they have 60-120mm fans lots of options even dba(noise) rating

ADDA DC Waterproof Fans


Learn something new everyday!

 

This is why I said have them blowing in. Might not be quite as efficient (jury's still out on that one) but they will last allot longer. I also found that for some reason they are allot quieter....

I thank you for this link, I have looked before for something like this but did not find anything. I am looking for some quiet low voltage fans to put down in the bilges of my fathers Cabin Cruiser, something I could hook up and let run all the time. Since its sitting in the ocean it is wet all the time and computer fans don't last very long, and Marine fans are way to expensive.

 

np bro, glad to be of help! one day when i up grade i will have to DIY my own hood and this kind of info will be invaluable! Thanks to you as well gazog and otty

 

Hm.. didn't think about the moisture factor. Good point, but for this tank, efficiency is more important than durability.. The fans can be replaced every month for all it matters, so I think we'll stick with just exhaust.

Thanks for the ideas, karma sundaes (with cherries) for all

spiral