Canopy fans, which direction and WHY?

Years ago I worked for a Contract that maintained an army base. One of the sheet metal guys did some work at the office that housed the people overseeing our contract. He ducted the exhaust fan from the Men's room into the Women's room. :-)

grouper therapy;719203 wrote: For all who voted for air in I think you should run your bathroom fans the same way:sick::eek:
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rdnelson99;719216 wrote: Years ago I worked for a Contract that maintained an army base. One of the sheet metal guys did some work at the office that housed the people overseeing our contract. He ducted the exhaust fan from the Men's room into the Women's room. :-)
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Do you think anyone ever noticed?:lol2::lol2::lol2::lol2::lol2:
 
It took about a week for a work order to come through stating "Terrible smell in Ladies Room". LOL This is the same guy who put down a task code K9 when he was sitting around doing nothing. It got kicked back saying "Task code K9 is for comp time in a submerged vessal. Since this base is in Arizona we do not believe there are any submerged vessals. Please correct and resubmit." LOL
 
Ok, I have no experience with this but I am going to tag along with a question. I just built the first canopy for my 90. I have a 400w MH that is over the shallow side of my tank. (meaning the side with less rock, and taller growing SPS, anemone, and my clam.) This light puts off a lot of heat, thus I have left large opening's in the top of my canopy. I am worried about salt creep on the reflector and other components (led night light strips, and compact flourescents I have for the lower light side.) I was thinking a fan would help remove the moisture from within the canopy. This would create more evaporation, but hopefully remove the necessity of a chiller. My main question is, should I waterproof the inside of the canopy somehow? Should I rest some egg crate on top of the tank to hopefully collect said evaporation to drip down a la rain style?
 
grouper therapy;719208 wrote: I like thought provoking threads. I have been thinking of ways to vent canopies I buikl without letting the light out . Got one I think but I need to try out on someones canopy(Robb) hint hint!
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I still have those darkroom louvers I bought earlier this year per your recommendation....still looking for a qualified individual to install them ;)
 
Depending on the scenerio, I have computer fans mounted and blowing directly onto my heatsinks for my <u>LED lighting</u>. If you place your hand on either side of the heatsink, you can feel the cool/warm breeze blowing out and up as the heat rises through my egg crate top. Without the fans it is hot to the touch, with the fans it is cool slightly warm to the touch.

For MH lighting, I would suspect air in would be better.
 
When I started my canopy build I wanted 2 fans and wanted it to come on only as needed as I did not want them to run all the time. I put in two 4” 120cfm fans. I added a thermostat inline and it was the wrong kind. It was for heating not cooling. You should have the fans exhausting or pulling out. If your house is dusty or anything going over the canopy it could suck it in and blow it on the water.

When I had the fans hooked up and when I turned them on it sounded like an airplane warming up and taking off and water temperature would drop to like 74* and then the heaters would come on.
I then changed them out for 12vdc computer fans and used the power I had run for the moon lights for the moment. But I already had the wires ran for 120vac so I got 3” 30cfm fans. They are much quieter but believe it or not all that and I don’t even use them. I have a manual switch at the moment and will add the inline thermostat later but the 2 holes are venting a good amount of heat.

I have a digital thermometer about 2” down in the water of the DT. And the hottest I’ve seen is 81*. i have moved it out of the water and it had gotten in the 90's. The lower part of the tank and the sump stay around 77*


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eagle9252;719428 wrote: ...You should have the fans exhausting or pulling out...
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True as my LED power supply pushes the air out in order to keep the supply cool. I don't think that would work too well with the heat sinks though. I agree with the general philosophy though.
 
Depends on how many fins are on them. LQQK at computer cpu's they exhaust by mass air flow sucking through tiny fins is cooler. Just think the heat sink is drawing the heat off of the cpu. Then you are sucking a lot of air past the fins and cooling the top side. But something is better than nothing.
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eagle9252;719899 wrote: Depends on how many fins are on them. LQQK at computer cpu's they exhaust by mass air flow sucking through tiny fins is cooler. Just think the heat sink is drawing the heat off of the cpu. Then you are sucking a lot of air past the fins and cooling the top side. But something is better than nothing.
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How does this relate to my question.
I have never seen finned fans for aquariums...
 
What size fans are you guys using? I just hooked up two 12v .3 amp 120 cfm fans to a 12v .6 amp power supply (wired in parallel). They do not seem to push a whole lot of air. Maybe I've hooked them up wrong?
 
My two 4&#8221; 120cfm fans were oversized when used as exhaust fans. The two 3&#8221; 30cfms are better but I really don&#8217;t use them unless I built a fire in the wood heater and its like 85 in the living room. I might be wrong but if you blow air from inside of the canopy on the heat sinks and never exhaust them from the canopy it will never cool correctly. You have to get the heat out of the canopy for it to work.
 
Why is this post here?
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http://rs153.pbsrc.com/albums/s203/hermetik/poster33238952.jpg%7E320x480" alt="" />

Probably someone voted


If it matters I have 2 fans wired to come on when the lights do and blow cool air over them, then another two bigger fans wired into the Apex to come on when if the tank temp get to high.
 
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