8'x8'x8' Grow Room Ventilation!!!!Help!

Keng Green said:

LMAO!! I'm in the same position right now. Don't have a cooled hood for the 1000HPS in about 8x8x8. Using a 4" inline fan for exhaust and similar one for intake. Got a really bad heat problem. goes from 82-88F. The heat stress is causing the plants to herm in week 8. Just got a stanley blower. Hooked that up close to the hood and kept the 4" in place. Still didn't work cuz i have a small ass pvc pipe as the exhaust pipe out the house and can't change it. Thinkin about making an additional hole for exhaust, but it really isn't feasible. NE suggestions for that?

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You need to cut a larger hole in the ceiling to duct the exhaust work out of

Why are you using a non horticulture light? Sounds like the light you're trying to use is a major pain in the ass. It's worth your time and money to get a real grow light and inline blower. All this gerry-rigged stuff is bullshit.

So you think he should BUY his way out of his crisis? Is that because YOU don't have to pay? LOL Your post and your signature are at odds.

itsgrowinglikeaweed said:

So you think he should BUY his way out of his crisis? Is that because YOU don't have to pay? LOL Your post and your signature are at odds.

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hahaha!! Good one! lol

My signature is meant to mock what Obama's (and the spend-happy Bush administration) doing to enslave every American to the devalued dollar. The fact that Lenin said it, tipifies precisely my point about socialism/fascism.

About his light situation though, he NEEDS a real one. Period.

yeah I know lol. I agree about Obama. (he's clueless & just doing what he's told). Of course that goes for every other president too. Except the one's that got assassinated, and that is why they got assassinated.
Damn...not supposed to talk politics in here.
I agree about the light too. But not about "gerry rigging"in general. I'm King Gerry The Great! LMAO They called me McGuyver in high school.
I made a DIY carbon filter today. A big one too. total cost= 24 bucks.
Comparable to ones going for 100. probably even better with twice the carbon.
Tomorrow...I'm making a cool tube out of a giant hurricane lamp.

I used to be an AMT certified by the GOV to do maintenance on acft in which I learned a great deal about sheet metal work and composite lay up. I will be building my own hood out of aerospace materials. I'm also a graduated engineer so I know plenty about thermo dynamics and the properties to do what I want. I just want some experienced input. Just because you can't build some high tech products from scratch doesn't mean it is jerry rigged. I call it a true custom. The light has the same ballast, ignitor, and capacitor as most other lamps just a diffrent houseing. We will see in the end who can do the best at the lowest cost.

I assume you could appreciate that right?

Absolutely! You cant beat a custom DIY job. You go man! I hope I didn't offend ya. Show us your finished work, should be good stuff. Peace.

itsgrowinglikeaweed said:

Absolutely! You cant beat a custom DIY job. You go man! I hope I didn't offend ya. Show us your finished work, should be good stuff. Peace.

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I had some time to kill today and went to home depot. Decided to use some starting collars instead of glass manifold adapters or sheet metal. cost 2.98USD for 1EA 5" collar. Now the bulb and ballast assembly are air cooled (see Pics). Then bought a few feet of .25" screen and made a 6" x 24" filter housing. 9 bones!!!!

Total including the entire light assembly - 15 dollars and some change. LOL!

Sounds like the start of something fun. The wall is up, sheet rock and insulation installed, and now for mounting and installing equipment/cooling system.

Cain, How noisey are those in-line jobs? I have a hydro farm squirrel cage which was quiet for about 4 months. Now it's makiing a racket. Bearings are crapping out I think. Can you hear that grow bright from another room?

cain129 said:

I had some time to kill today and went to home depot. Decided to use some starting collars instead of glass manifold adapters or sheet metal. cost 2.98USD for 1EA 5" collar. Now the bulb and ballast assembly are air cooled (see Pics). Then bought a few feet of .25" screen and made a 6" x 24" filter housing. 9 bones!!!!

Total including the entire light assembly - 15 dollars and some change. LOL!

Sounds like the start of something fun. The wall is up, sheet rock and insulation installed, and now for mounting and installing equipment/cooling system.

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That's not going to work good. That's going to work great! I like it. Nice!

Mr. Beans said:

Cain, How noisey are those in-line jobs? I have a hydro farm squirrel cage which was quiet for about 4 months. Now it's makiing a racket. Bearings are crapping out I think. Can you hear that grow bright from another room?

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Never used one yet. I'm sure they are loud if you don't mount them properly or in the right place as would any fan. The best from my research shows something like this would be best - http://www.hydroponics.net/i/133759

I will use the above exhaust for the light and filter and a cheaper gable vent for an emergency exhaust connected to a thermistor

itsgrowinglikeaweed said:

That's not going to work good. That's going to work great! I like it. Nice!

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I'm Stoked on how everything is coming together! Going to put a nice fan on the light and filter, about 500cfm, and use a gable vent or inline, 500cfm minimum, for emergency exhaust on a thermistor.

Everything will have semi ridged duct work.

6"x24" carbon filter to a 5" semi ridged duct, then to the light and out the opposite side of the hood stepped up to 6" semi ridged duct to the fan and out the ceiling into the attic.

Attic will be vented with exhaust fans on the turbine stacks eventually for overall efficiency on the home A/C.

The light hood will be like a jet engine diffuser. letting the air expand, witch helps cooling and the preceding 5" duct from the filter will create a higher velocity and lower pressure (Bernoulli principal) on entry creating a ram air effect entry and a vacuum out the 6" at the convergence on the exhaust. ....HOPEFULLY. LOL!