Placement and # of DIY fans in 125 canopy...

[my5girls]

Would you go with 2 or 4 of the new Ice Cap 4 inch fans in a 125 canopy. 1 on each end or 2 on each end. Also do both ends need to blow across the water, pointing toward each other or one end blow out to vent the canopy? I am kind of confused on that issue. I will be running a combo of 3-250w MH and 4-96w PC or 4-80wT5.

 

[bigb]

Vent it, opposite ends. One side blowing in the other blowing out.

 

[reefnut]

Is it a solid canopy?? or does it have an open back??

 

[misfit]

I would use 4 fans,close off the back 2 blowing in a 2 blowing out and place the top of the fan even with the bottom of the light.Or at least thats what i have and works beautiful.Running 3x250 DE HQI + 4x96w PC And the haildes are about 10" to 11" from the water

 

[reefnut]

Having the fans blow across the water is the best way to keep things cool... although the ultimate goal is to get air flowing through the canopy.

 

[my5girls]

Tha canopy is open in the back. It is kind of on the short side though, maybe 7 inches tall. I am getting the retro lights with the UV shield so hopefully that will be alright as far as being about 6 inches off the water.

 

[reefnut]

Should be fine... with an open back you will not get a "draft" through the canopy so personally I'd use four fans positioned to blow across the water. Maybe one on each side and two on top??

 

[thegrog]

I'd say one on each end and one on the top-center would be enough. With the open back, there will be a natural air flow out so no need for too much air flow.
Just my opinoin.