Question about Fans

[bmallia82]

If you have 2 fans on the side of your hood. I would assume that you have 1 blowing across the water and the other blowing it out. is this correct?

I am still have major temp problems on my 95 gallon tank. My water is not getting colder than 80 degrees, and by 8pm the water temp is almost 84 degrees.

Some1 suggested cleaning my pumps. I may actually just take out my whole sump today and clean the pumps, rinse out all filtration and take it from there.

This is extremely frustrating since my tank is doing very well. I have had great patience and now I am starting lose it. I NEED to STABALIZE my TEMP!!!

 

[michaeldaly]

I would actually have both blowing inside and make some holes in the back of the hood for the air to escape

 

[kraze3]

Or maybe you could add 2 more fans. Ive also seen tank hoods where the whole back is open for air exchange

 

[jer77]

I agree with michael, the fans should be blowing into the fixture for a few reasons. More air is blown over the water, and less moisture gets into the fans.

 

[AZDesertRat]

If you have one blowing in and one out you only have the CFM volume of one fan not two. Have them both blowing in and have openings as high up on the back as possible or even on the top like I did for heat to escape. That way you also take advantage of convection for heat transfer. I used a 4" holesaw and put holes over my reflectors so light doesn't escape but hot air does.

 

[coryherby]

i have two fans in mine..i have them blowing out. I honestly don't think it makes much of a difference. Either way your getting air movement in the hood. I heard it was bad to have fans blowing on the lights, that was why i did it that way. One thing I have noticed is that there is a pile of dust on the wall behind the fans. I guess it is good to have that dust being blown outside rather than inside..however it is only dust and would be small amounts.

 

[salreus]

using fans is to increase evaporation. blowing fans on the water vs out of the tank would cause more evaporation. This just depends on how you are trying to cool your tank. You can blow fan air on the tank to cause evaporation or you can use fans to pull out the heat caused by the lights. Other things that cause heat in an tank. submerged pumps and the physical location of the lights to the water level. As well as having your tank covered. keeping the glass on the tank can really cause heat to build up.

So, to cool a tank you can.

flow air across the water to cause evaporation
pull hot air from the tank cause by the lights
increase the distance between the lights and the water level
remove glass if lights are still protected..
replaced submerssible devices with external if possible.
oh or get a chiller.....
I might be missing a few things