How many fans in my canopy?

spiderman2000 · 04/14/2006, 09:54 AM

I am going to build my new canopy this weekend, its 72X24X23 its for my new 180 gallon tank. I have 2 Hamilton 400 watt MH retrofit lights and 4 96watt actinics.

I purchased 2 120mm AC 110 cfm fans. I was wondering would 2 fans work fine.

if so should I have one run all the time and one run when the water temp reaches a certain temp?

should I run them both all the time?

should I get a third fan and have the 2 run all the time and the extra one come on at temp?

These fan produce a lot of air flow. I have no prior experience with MH and the Heat they produce. your help would be greatly appreciated.

gvibes · 04/14/2006, 10:12 AM

Basically, I would just run them enough to keep things cool enough.

It may not be a bad idea to put them on a timer and just have running at the same times your lights are running.

spiderman2000 · 04/14/2006, 10:22 AM

I plan on only running them when the lights are on.
i am just curious to how much air flow i need so i don't over heat the tank.

Thanks for the reply

kabal2 · 04/14/2006, 10:32 AM

you can run one in a timer with your lights, and 2 when the temp reach a tempeture, i have 2 in my tank that come on when the temp hits 80, a good thing about something like that you dont have to hear your fans all day long, just mho

04/14/2006, 09:54 AM	#1
spiderman2000 Premium Member Join Date: Dec 2005 Location: Salem, Oregon Posts: 65	How many fans in my canopy? I am going to build my new canopy this weekend, its 72X24X23 its for my new 180 gallon tank. I have 2 Hamilton 400 watt MH retrofit lights and 4 96watt actinics. I purchased 2 120mm AC 110 cfm fans. I was wondering would 2 fans work fine. if so should I have one run all the time and one run when the water temp reaches a certain temp? should I run them both all the time? should I get a third fan and have the 2 run all the time and the extra one come on at temp? These fan produce a lot of air flow. I have no prior experience with MH and the Heat they produce. your help would be greatly appreciated. __________________ checkout my 180 build http://www.reefcentral.com/forums/showthread.php?s=&threadid=855534 Current Tank Info: 46 bow FOWLR with a 15 Gallon sump. and a 20L Nano-Reef with 10 gallon sum... soon to be 1 180 gallon reef tank.

04/14/2006, 10:22 AM	#3
spiderman2000 Premium Member Join Date: Dec 2005 Location: Salem, Oregon Posts: 65	I plan on only running them when the lights are on. i am just curious to how much air flow i need so i don't over heat the tank. Thanks for the reply __________________ checkout my 180 build http://www.reefcentral.com/forums/showthread.php?s=&threadid=855534 Current Tank Info: 46 bow FOWLR with a 15 Gallon sump. and a 20L Nano-Reef with 10 gallon sum... soon to be 1 180 gallon reef tank.

04/14/2006, 10:32 AM	#4
kabal2 Premium Member Join Date: Dec 2004 Location: North JERSEY 07438 Posts: 1,103	you can run one in a timer with your lights, and 2 when the temp reach a tempeture, i have 2 in my tank that come on when the temp hits 80, a good thing about something like that you dont have to hear your fans all day long, just mho __________________ Within the beauty of woman.... .... lies the face of God

04/14/2006, 10:12 AM	#2
gvibes Registered Member Join Date: Feb 2006 Location: Chicago Posts: 239	Basically, I would just run them enough to keep things cool enough. It may not be a bad idea to put them on a timer and just have running at the same times your lights are running.