WMAS Discussion Forum : Fan placement in new hood .. ? http://www.utahreefs.com/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 17 Jun 2026 02:03:28 +0000 Sat, 07 Feb 2004 15:00:02 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.03 360 www.utahreefs.com/forum/RSS_post_feed.asp?TID=1848 <![CDATA[WMAS Discussion Forum]]> http://www.utahreefs.com/forum/1by1.gif http://www.utahreefs.com/forum/ <![CDATA[Fan placement in new hood .. ? : Shane, Try just one fan to see...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17153&title=fan-placement-in-new-hood#17153 Author: jfinch
Subject: 1848
Posted: February 07 2004 at 3:00pm

Shane,  Try just one fan to see if it will do the job on it's own.  One less fan is $25 less bucks and a few dB lower.

BTW, you didn't ask, but Standard Supply has orion (www.orionfans.com) 4" fans for around $25.  They're the quietest big air moving fan I've ever not heard.  They're the same fan Hamilton uses in their fan kits.



Edited by jfinch]]> Sat, 07 Feb 2004 15:00:02 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17153&title=fan-placement-in-new-hood#17153 <![CDATA[Fan placement in new hood .. ? : Right on. I will have two 4&#034;...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17151&title=fan-placement-in-new-hood#17151 Author: ssilcox
Subject: 1848
Posted: February 07 2004 at 2:52pm

Right on. I will have two 4" fans blowing in, between the uv filter and the water.

Great - thanks guys. I'll let you know how it works out.

-Shane

]]> Sat, 07 Feb 2004 14:52:36 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17151&title=fan-placement-in-new-hood#17151 <![CDATA[Fan placement in new hood .. ? : If you have enough vents (my hoods...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17150&title=fan-placement-in-new-hood#17150 Author: jfinch
Subject: 1848
Posted: February 07 2004 at 2:49pm

If you have enough vents (my hoods are always open in the back, plenty of vent space) then Mark's right, ime.  Blowing in across the water results in better cooling.  I think it also results in more "dust" falling into the water which is something I've pondered about.  The key might be having enough venting.  My current hood (125 gal) has one 6" fan.  Originally I had it pulling, it didn't do the job.  So I switched it to push and have much better temperature swings.]]> Sat, 07 Feb 2004 14:49:09 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17150&title=fan-placement-in-new-hood#17150 <![CDATA[Fan placement in new hood .. ? : Hmmm - dont want to start a debate...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17149&title=fan-placement-in-new-hood#17149 Author: ssilcox
Subject: 1848
Posted: February 07 2004 at 2:29pm

Hmmm - dont want to start a debate on that but being the computer geek that I am I was planning on the push - pull fan method also. I wonder if I would get less evaporation if I blew air in and then out the back? ]]> Sat, 07 Feb 2004 14:29:54 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17149&title=fan-placement-in-new-hood#17149 <![CDATA[Fan placement in new hood .. ? : Chrisslc, your method works well...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17093&title=fan-placement-in-new-hood#17093 Author: Mark Peterson
Subject: 1848
Posted: February 07 2004 at 5:30am

Chrisslc, your method works well for computer cases and homes, but physics doesn't agree with you in the case of aquarium hoods.
Aquarium hoods are supposed to be fairly open so there is no real pressure build up. It's been my experience that two fans, both blowing in to avoid salt corrosion, will cool almost twice as good because they move twice as much cool air in. The hot air is pushed out all the openings.

Edited by Mark Peterson]]> Sat, 07 Feb 2004 05:30:05 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17093&title=fan-placement-in-new-hood#17093 <![CDATA[Fan placement in new hood .. ? : Just an opinion from someone who...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17074&title=fan-placement-in-new-hood#17074 Author: chrisslc
Subject: 1848
Posted: February 06 2004 at 8:30pm

Just an opinion from someone who used to supercharge pc's alot (personal computers not power compacts). I always put inflow and outflow in everything because just blowing air out or in will create a vacuum or pressure, respectivelly, and nullify your air movement. Even with adequate (sp.?) venting using an inflow fan on one side and an outflow on the other will GREATLY improve cooling by moving out the hot air faster. just adding in my little contribution, not even sure it's 2 cents worth but there ya go

Edited by chrisslc]]> Fri, 06 Feb 2004 20:30:27 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17074&title=fan-placement-in-new-hood#17074 <![CDATA[Fan placement in new hood .. ? : My opinion is that 1/8&#034; is...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17073&title=fan-placement-in-new-hood#17073 Author: jfinch
Subject: 1848
Posted: February 06 2004 at 8:20pm

My opinion is that 1/8" is ok.

]]> Fri, 06 Feb 2004 20:20:32 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17073&title=fan-placement-in-new-hood#17073 <![CDATA[Fan placement in new hood .. ? : Sounds good to me. I was going...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17070&title=fan-placement-in-new-hood#17070 Author: ssilcox
Subject: 1848
Posted: February 06 2004 at 7:26pm

Sounds good to me. I was going to go with 1/8" tempered glass - is that going to withstand the temperatures? I like the idea of venting the bulb area.

]]> Fri, 06 Feb 2004 19:26:26 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17070&title=fan-placement-in-new-hood#17070 <![CDATA[Fan placement in new hood .. ? : I&#039;m with Jon, I would go...]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17068&title=fan-placement-in-new-hood#17068 Author: Sarnack
Subject: 1848
Posted: February 06 2004 at 6:07pm

I'm with Jon, I would go with between the UV Glass and water... All of the DE pendants I have seen do not have have fans in them.  ]]> Fri, 06 Feb 2004 18:07:46 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17068&title=fan-placement-in-new-hood#17068 <![CDATA[Fan placement in new hood .. ? : I have read similar articles......]]> http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17062&title=fan-placement-in-new-hood#17062 Author: jfinch
Subject: 1848
Posted: February 06 2004 at 4:53pm

I have read similar articles... there must be some bit of truth there, no? 

I've always put fans in the side of my hood and blown inward directly past the bulbs.  I've never done it any other way, so I can't really comment on whether or not it shorten the life or color shifted the bulbs.  My reasoning why it might not matter is in a SE bulb, the arc tube is insulated from the fan air by 1/2 to 1 inch of vacuum and the outer bulb.  I'm assuming the bulb manufactures evacuate the air between the inner arc tube and the outer bulb before sealing it off (anyone know if this assumtion is true?).  If that's the case, the only mode of heat transfer between the outer bulb and inner tube is radiation and may not be enough to effect the burn.  But you're using DE bulbs and in that case you have convection working against you.  I'd vent the bulb housing, but blow the fans between the water and UV protecting glass.  Evaporation is a major source of tank cooling using fans, not just the mechanical removal of hot air. 

Just my 2¢

]]> Fri, 06 Feb 2004 16:53:32 +0000 http://www.utahreefs.com/forum/forum_posts.asp?TID=1848&PID=17062&title=fan-placement-in-new-hood#17062