Heat-What I am doing wrong?

[TheMetal1]

I'd refer to StinkyAttic's post regarding the size of your intake. As far as pulling air in? If you have a sealed enclosure (grow tent, box, cabinet, etc.) and you mount an exhaust... you will not need a fan to "pull" air IN. People do use them (referred to as Active Intake) depending on their situation... but you should be ok starting out. Since the space is sealed, the only way your exhaust can pull air OUT is by giving it an open source (i.e. a big hole in the side :jointsmile

I'm kinda confusing myself now. Either way, back to the bowl analogy :hippy:

The clogged bowl = Your sealed grow space
Finger over carb = No passive intake in grow space
Your lungs = Exhaust fan pulling air through

You try to inhale... but your finger is blocking it. You move your finger slightly... a little air comes through, but not enough. You completely remove your finger... total airflow :thumbsup:

Now, would you need a small fan where the carb is to push the smoke/air into your lungs?
- Probably not... but with larger spaces, where negative pressure is more difficult to maintain, it can help.
Woah... I'm losing myself now.
As far as the a/c air?? Well, I don't even have a/c in my place... and my box temps are about 79 during the day and maybe 60 at night? Not sure about that night temp because I just flipped to 12/12. Haven't had too many "nights" to build an average from.

But yeah, check out Stinky's stickies... and the grow room set-up sticky by Rhizome. Lots of reading, but it's sooo worth it!! :stoned:

[Dreadscale]

Hey sirsmokealot23 :thumbsup:

I'm sure by the screen name you thought I was an Iksar ShadowKnight, but IRL I am a Carpenter.
If your grow is in an attic, your temps. are way higher than outside.
If your space has no insulation you need to install at least some R-19, cealing,walls, and floor.
2 reasons, heat loss/gain, and heat signature. In winter you will lose all your heat/summer gain, and also have a big signature." Only spot on roof with no snow"
In a pinch you can pull air from the floor below the grow. Find an uninsulated wall " Most Interior Walls" and drill a 3" hole or a 4" on a 6" wall, in the top plate. Find the bay below,"Between the Studs", and cut in a vent. A lot of sizes and styles are available for the vent cover. With an exaust this will work great. "BUT not in an OPEN attic"
In a 10x10x8 attic you must live in a Victorian or a real high end home.

Just pull in some fresh air, AC is good, but fresh is a need.
Good Luck

[stinkyattic]

Try to pull your intake air from the living space, which I assume is a comfortable temp.
Exhaust to outside is good; don't forget your carbon filter!
Insulating the attic is also important. I live in a Victorian with a walk-up attic that is insulated really poorly, with a big window that catches afternoon sun... it's blisteringly hot up there some days, and I fought high temps every time I tried to stink up my attic Do you have a way to reduce heat entering the attic, such as putting up blinds on any window you might have, and keeping the attic door closed in summer so heat from the house can't get up there? Then you'd need to think of how to get your cool intake air to the tent.
You're getting plenty of solid advice here! Good luck!

[sirsmokealot23]

I didn't even think about the heat from the house floating up into the attic. I think I'll take your advise and put in an intake fan. I can put the board back in and then cut a hole in it for ducting. That way I'm not getting hot air floating in..I'll be getting cool air pulled in. I've already got the whole attic insulated because I too live in a victorian. O one more question if you have time. I didn't want to start a separate thread for this but... Say I have a 150 cfm exhaust fan and then I connect a 200 cfm exhaust fan with ducting to that one. Will the fans work at 350 cfm or not? The reason is because I have a lot of fans but not many outlets for exhaust. Thanks again for all your help along with everyone else that has added to this great site.

[stinkyattic]

Actually you are going to end up DECREASING your cfm efficiency and here's why:
Adding another fan, especially a mismatched one, is going to add TURBULENCE to your duct system and acutally BLOCK air flow. Clear, straight, smooth ducting is best, with just a SINGLE fan. By the same token, if you have an active exhaust AND an active intake, the fan cfm must be perfectly matched, or you're actually better off just running an exhaust fan to PULL air through the whole system, leaving anice big unobstructed intake hole- preferably in a cool area. If you can bring cool air up from the basement via an unused chimney, or from and iar conditioned room via a duct, that would be nice.