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

cain129

cain129

Well-Known Member
I need help determining/brain storm a filtration/circulation system for an 8'x8'x8' grow room. Fully insulated stud walls.

400w highbay HPS with 8" A/C duct run to the room and mounted at the floor with vent. A ceiling exhaust vent hole that will push air through the attic approx 50" and mount to a roof turbine for exhaust. It will have a carbon filter on it prevailing the fan.

I was thinking of using one of these for the exhaust fan.

http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&productId=100385905&langId=-1&catalogId=10053&cm_sp=d26-_-plumbing-_-subcat-_-Bath_Fans

or one of these
http://www.iaqsource.com/product.php?p=suncourt_db308p&product=111132

Please help with best product and best price.
I want to take in consideration for expansion of light wattage and exhaust capacity in the future.

Or this
http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100396529
 
Mcgician

Mcgician

Well-Known Member
If you're only using one 400W light, that won't be enough to light up an 8 by 8 area for one. Two, just air cool the light. Problem solved. Just vent the room every hour or so through a carbon filter to bring in fresh air passively and you're done.
 
itsgrowinglikeaweed

itsgrowinglikeaweed

Well-Known Member
The 1st one is no good at all. The 2nd one is weak ,I have 1 of those. It moves air but not nearly good enough to attach any kind of filter to it. the 3rd one @ 800 CFM is obviously better but still isnt powerful enough to filter it. You want somthing with some sack! You need a centrifugal fan like > http://cgi.ebay.com/6-Valuline-Centrifugal-Inline-Exhaust-Fan-Vortex_W0QQitemZ390038364175QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5ad019200f&_trksid=p3286.c0.m14&_trkparms=72%3A1205%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A0%7C293%3A1%7C294%3A50
Especially since you mentioned possible expansion.
And Mc is right if you want to use the whole 8X8 space one 400W is inadequate. Best of luck!
 
cain129

cain129

Well-Known Member
itsgrowinglikeaweed said:
The 1st one is no good at all. The 2nd one is weak ,I have 1 of those. It moves air but not nearly good enough to attach any kind of filter to it. the 3rd one @ 800 CFM is obviously better but still isnt powerful enough to filter it. You want somthing with some sack! You need a centrifugal fan like > http://cgi.ebay.com/6-Valuline-Centrifugal-Inline-Exhaust-Fan-Vortex_W0QQitemZ390038364175QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item5ad019200f&_trksid=p3286.c0.m14&_trkparms=72:1205|66:2|65:12|39:1|240:1318|301:0|293:1|294:50
Especially since you mentioned possible expansion.
And Mc is right if you want to use the whole 8X8 space one 400W is inadequate. Best of luck!
Click to expand...
Thanks, I am aware that the 400 HPS isn't enough but It's all I currently have, going to spend money to get all necessities to make the room usable first. Then expand and upgrade over time.
 
cain129

cain129

Well-Known Member
cain129 said:
Thanks, I am aware that the 400 HPS isn't enough but It's all I currently have, going to spend money to get all necessities to make the room usable first. Then expand and upgrade over time.
Click to expand...
A change of scenario. I got a 1000w HPS last night. What size fan should I use for this?
 
B

bryant228

Well-Known Member
cain129 said:
A change of scenario. I got a 1000w HPS last night. What size fan should I use for this?
Click to expand...
Keeping a 1000watt HPS cool can be hard. You need a powerfull fan. And you won't find it at home depot. Get this:

http://htgsupply.com/viewproduct.asp?productID=52583

I have two of these in my room. One for my room ventilation and one for just my light. What type of hood do you have for your light? No matter what type of fan you get, the light is still going to give off radiant heat. Some pics of your room would be helpful too.
 
cain129

cain129

Well-Known Member
bryant228 said:
Keeping a 1000watt HPS cool can be hard. You need a powerfull fan. And you won't find it at home depot. Get this:

http://htgsupply.com/viewproduct.asp?productID=52583

I have two of these in my room. One for my room ventilation and one for just my light. What type of hood do you have for your light? No matter what type of fan you get, the light is still going to give off radiant heat. Some pics of your room would be helpful too.
Click to expand...
The hood is not for growing. It is a 1000w HPS flood light similar to this http://www.lightmart.com/index.asp?PageAction=VIEWPROD&ProdID=19753
but the bulb is mounted horizontal instead of vertical. The ballast, ignitor, and capacitor are all mounted in the hood also. I can easily cut some 6" holes on either side of the hood and build my own duct plenum/tap to mount inline filter, and duct to exhaust fan. What do you think.

I will get some pics posted soon. If they aren't up tonight, it will be atleast a week before I can post them as I will be out of town.

The true dims of the room are 8'x8'x7'
 
itsgrowinglikeaweed

itsgrowinglikeaweed

Well-Known Member
Oh my. I certainly dont want to rain on your parade, but I don't know if your going to be too happy with that. Besides the heat of the light itself, the ballast for a 1000w HPS gets hot as a hell. Put it in a hood WITH the HPS bulb and Yowzers thats going to be beyond HOT. The heat generated by the bulb AND the ballast together will also shorten the life of each (the bulb and the ballast). Thats why grow lights have remote ballasts. You can probably separate the ballast from the rest of the unit by splicing a length of wire between it and the hood/bulb assembly. I'd like to hear what everyone else thinks???
 
cain129

cain129

Well-Known Member
itsgrowinglikeaweed said:
Oh my. I certainly dont want to rain on your parade, but I don't know if your going to be too happy with that. Besides the heat of the light itself, the ballast for a 1000w HPS gets hot as a hell. Put it in a hood WITH the HPS bulb and Yowzers thats going to be beyond HOT. The heat generated by the bulb AND the ballast together will also shorten the life of each (the bulb and the ballast). Thats why grow lights have remote ballasts. You can probably separate the ballast from the rest of the unit by splicing a length of wire between it and the hood/bulb assembly. I'd like to hear what everyone else thinks???
Click to expand...
That is what my initial thoughts were. I am experienced with the HID lights..mostly MH though because I used to be big into reef aquariums. Then I thought a 1500CFM fan would cool both if I modded the hood.

8" Central A/C duct will be run to the room and dropped to floor level. I can add a window unit to the wall under construction if I must. I will use 2 fans. 1 for venting the room once temps hit 85 utilizing a thermostat and one that is constant on the filter and light assembly.

I also need to put the light on a thermostat to in case the cooling fan fails. I want the light to shut dawn in that event. SAFETY FIRST! I need some advice on this.
 
itsgrowinglikeaweed

itsgrowinglikeaweed

Well-Known Member
"That is what my initial thoughts were. I am experienced with the HID lights..mostly MH though because I used to be big into reef aquariums. Then I thought a 1500CFM fan would cool both if I modded the hood. "
Ok then, you seem to know whats up and you have a plan. Sounds good. Go for it. But i would still try to separate the ballast. Keep in mind the rating on that fan is without ducting, which will reduce the CFM's.
 
cain129

cain129

Well-Known Member
itsgrowinglikeaweed said:
"That is what my initial thoughts were. I am experienced with the HID lights..mostly MH though because I used to be big into reef aquariums. Then I thought a 1500CFM fan would cool both if I modded the hood. "
Ok then, you seem to know whats up and you have a plan. Sounds good. Go for it. But i would still try to separate the ballast. Keep in mind the rating on that fan is without ducting, which will reduce the CFM's.
Click to expand...
Forgot about that...it wont be 1600cfm with 4' of 6" duct. I have to re-plan this.
 
K

Keng Green

Active Member
itsgrowinglikeaweed said:
Back to the drawing board. LOL
Click to expand...

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?

:peace:
 
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