TOO many Lights??

[iBlazeBubonic]

I have a stealth night stand i am still in process of constructing and i have it set up with 8 CFL lights, 4 6500k 1600Lumens and 4 2700k 1700Lumens, im going to be using two 120mm pc fans for intake and exhuast, my concern is that there may be too much heat because my night stand is approx 3x1x3, ill get better specs when i can but im just wondering if they are going to throw off too much heat any suggestions or opinions??

 

[tjmccoy]

I dont know about the light heat part cuz I run the big daddies but you'd be better off using your 2 fans as exhaust and increasing the intake hole. This will give you twice the airflo. Also exhaust from the top and intake at the bottom on opposing sides

 

[FreezerBoy]

Wire em up, fire em up, see what happens. Intake fans can seriously compromise security if you don't know what you're doing. I know just enough about them to say you want a smaller intake fan than exhaust. Pumping air in faster than you pump it out is positive pressure which will by-pass your filter, pumping smell into the room.

Ventilation 101

 

[iBlazeBubonic]

well what if i have the same size fans for both, i have two 120mm computer fans, and exhuast will be on top and oppsing side of the intake, will this still cause positive pressure, they both are the same 76 cfm and they both run at 36 db which is not loud they r actually virtually silent.

 

[FreezerBoy]

An intake fan the same size as the exhaust fan is the Express Lane to positive pressure. The easy way to avoid Positive Pressure is two passive 120 mm intakes for each 120 mm powered exhaust. If you want to figure out exact numbers, Ventilation 101

 

[stihgnobevoli]

heat shield brings the temps down. dropped mine 10c. i thought it would raise the temps since its mostly blocking the airflow from the intake to the exhaust. but i guess since most of the heat is contained above the plants all the little air coming in the bottom is enough to cool the plant area as well as the ballast/bulb area. looks like its primarily keeping the heat from spreading throughout the whole box.

 

[iBlazeBubonic]

So if i just have a hole for intake and no fan this will create negative pressure because the exhuast fan will blow the air out, but wont the smell leek out of the intake whole.... by passive do you mean not pusshing air like it just allows air through right? this is where im confused, should i have two exhuast fans then???

 

[FreezerBoy]

Answers are yes, no, yes and no.

A quick primer on Negative Pressure

 

[iBlazeBubonic]

Thanks so much Freezer you are a great help, if it wasnt for you my stealth would be compermised, and i appretiate ur quick responses, i have already cut out the two holes, for intake and exhaust..... should i cover up the intake and just drill some holes for the intake what should i do?

 

[microgram]

As long as you have more pushing out, then you will have a negative pressure inside your cab by a hundredth of a pressure point. If you have the same number of exhaust and intake fans, and you add a filter onto your exhaust, you'll lower the exhaust CFM causing odour to be expelled from your container. Try covering the intake holes with some dark fabric, something that light wont penetrate. Or, even better, build a hood that directs the fresh air down. If you do it right, you won't have any light leaking out of the intake holes.

The one thing about negative pressure that is well, negative, puns! is that you can't control the quality of air. More times then not, mold wont be an issue, just clean out your case occasionally and don't let water sit for too long

 

[FreezerBoy]

If you cover the intake there's no air exchange and no negative pressure. Leave the present intake and add another. 3 holes per fan, two for intake one for exhaust. Intakes should be filtered and light-proofed but, open.

While my 120 mm 76 cfm toyo fan could cool my 250, it couldn't accommodate a can type scrubber. Axials are the least capable fans for dealing with back pressure (resistance as provided by scrubbers) I'd keep lamp wattage at 150 or less and hope it keeps smells low enough to try an odorsock style filter which is about all an axial can handle.

here are some other MicroScrubber links
http://www.icmag.com/ic/showthread.php?t=48949
http://www.icmag.com/ic/showthread.php?t=125864&
http://www.icmag.com/ic/showthread.php?t=108182