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peiji View Drop Down
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Joined: October 07 2002
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Points: 2142 		Post Options Post Options   Thanks (0) Thanks(0)   Quote peiji Quote  Post ReplyReply Direct Link To This Post Topic: Fan
    Posted: July 19 2005 at 4:39am
Quick question about fans. I've been running my tank without one and it
seemed to be OK until this last week. I've been in Japan for 10 days and
when I got back, I noticed the temp has jumped up. The high temperatures
over the past few weeks outside are effecting my tank it appears even
though it's in the basement. Any suggestions on fans? Will any old clip on
fan work? Should I invest in a computer-like fan and build it into my hood?
Do I point it straight down in the water if it's just a temporary solution?
Should I put it in the sump or at the top near my lights? BTW, I have MH
with an open top and open back hood. That's why I haven't had a problem
with heat until now. Maybe this is just a temporary problem but I need to get
my temp down quick because I ordered a bunch of SPS's. The temp right
now is about 84.
Jared Page
Highland, UT
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tileman View Drop Down
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Joined: November 05 2003
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Points: 5368 		Post Options Post Options   Thanks (0) Thanks(0)   Quote tileman Quote  Post ReplyReply Direct Link To This Post Posted: July 19 2005 at 7:05am
I have two computer fans in my open back and top canopy and in the last couple of weeks my temp rose also, so I just put a clip on fan on the top of the canopy and pointed it down into the water and it brought the temp right down to where it should be 78. I believe you would get the same results by putting it down by the sump also.  Just beware you will have more evaporation of water with the fan.
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dnellans View Drop Down
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Joined: October 29 2003
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Points: 842 		Post Options Post Options   Thanks (0) Thanks(0)   Quote dnellans Quote  Post ReplyReply Direct Link To This Post Posted: July 19 2005 at 11:20am
i would just buy a clip on if you think its a temporary problem.  walmart has some $8 clip on fans with 2 speeds that are pretty big (and white) and i've got one going on my sump.  lowered the temp from 84 to 79 where the heater now is even kicking in.  a good investment in my book!

-dwn
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derikhills View Drop Down
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Points: 87 		Post Options Post Options   Thanks (0) Thanks(0)   Quote derikhills Quote  Post ReplyReply Direct Link To This Post Posted: July 19 2005 at 11:24am
I would go with a fan in the hood, mabey between the lights and water(if possible) seems more eficient to prevent the initial heating of the water than cooling it after its been heated.  I'm really interested in Japan so if you don't mind could you PM me about your trip
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Mark Peterson View Drop Down
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Points: 21437 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark Peterson Quote  Post ReplyReply Direct Link To This Post Posted: July 19 2005 at 7:12pm
A fan is certainly efficient at moving hot air away from the lights, but it's greatest value is in the cooling effect of evaporating water. The fan is most efficient when pointed slightly down across the surface of the water.

Clip the cheap fan on the back side of the hood to blow air in and down on one half and the heat will escape as hot moist air from the other half of the backside.
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