Problem with heat in grow box

I have a 4 foot tall 18" wide and 13" deep growbox. It has 2 exhaust pc fans and 1 intake fan. I cannot seem to get the temperature to get lower than 86 when the lights are on. Also running the 300w Mars hydro light and my room temperature where the box is in is 66. Any ideas?

That's only 6.5 ft3. You shouldn't have any problems if your fans are located correctly.

Is it next to any hot water or steam pipes?
Is it inside of a wall in an uninsulated area? (Exposed to outside temps)
Are your fans oriented correctly? (Intake blowing in and exhaust blowing out)
Do you have any circulation fans inside of the box?

Get yourself an inline fan, the pc fans probably aren't cutting it. Those are fine for bringing fresh air in, but if you're trying to cool a light you're gonna need a legit fan. A 6 inch inline fan usually isn't more than $70, get that and some ducting and your heat problems should be eliminated. I'm cooling a 600w, turned down to 450w just fine with my inline fan.

kratos015 said:

Get yourself an inline fan, the pc fans probably aren't cutting it. Those are fine for bringing fresh air in, but if you're trying to cool a light you're gonna need a legit fan. A 6 inch inline fan usually isn't more than $70, get that and some ducting and your heat problems should be eliminated. I'm cooling a 600w, turned down to 450w just fine with my inline fan.

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I have 2 exhaust fan you think I should get 1 and leave the second exhaust as is or get 2 inline fans?

I'm having the same problem right now. These little PC fans just don't have the juice to push the heat out, especially if you're running a carbon filter. Look on Amazon for AC powered PC-style fans, they're designed for server racks but they move about 2-3 times the air of the DC powered versions. Same size/shape so you don't have to change up your design.

I found some 120 cfm computer fans I'm gonna try see how they work

Pinball24 said:

I found some 120 cfm computer fans I'm gonna try see how they work

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were to purchase ? computer run

you can buy computer fans all day long on ebay and amazon. i suggest at least 120 mm, i'm running 200 mm. you can buy a plug in adaptor and wire them to it, even put a plug on the end so you can change it out if it ever fails. just make sure you get an adaptor thats rated the same or slightly lower than your fan.

ah, i did not see what you were using the fans for. i would suggest getting a 4 inch inline booster fan. they come built into a piece of 4 inch pipe, and are intended to help air along a long stretch of ducting, but they work great for small areas
https://www.amazon.com/Hydroplanet-Duct-Booster-exhaust-4-inch/dp/B019J2NU3S/ref=sr_1_1?ie=UTF8&qid=1491916586&sr=8-1-spons&keywords=4+inch+booster+fan&psc=1
know that says 100 cfm, but thats when they're slaved to a bigger fan, by itself its probably 50 cfm, and they aren't that loud at that size.

You think that would be worth it or just stick with 2 of these for each exhaust. They say 110cfm each. Worst this is I could return them if they don't work. Well I can't post the link cause I'm new here but it's basically just a 120mm cabinet fan

Post a pic of your set up if you can @Pinball24

coreywebster said:

Post a pic of your set up if you can @Pinball24

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Alright I will when I get home