Grow Room Setup

I've been helping my caregiver set up a grow room in his basement. I've gotten a lot of information off this site over the past couple months, and I figured it was time to become an active member here. Anyways, I'm just looking for any tips/ideas to improve the setup. It's very much a work in progress, it probably won't be 100% until the second or third crop. The first crop (30 plants) were potted and put under the lights about two weeks ago.

There are two 10x10x8 rooms, connected by a hallway/vestibule. Each room has:

4 x 1000w Digilux HPS bulbs with Big Foot 8" hoods and digital ballasts
2 x 745 cfm centrifugal fans (one for lights one for air circulation)
2 x 500 cfm inline duct fans (for lights)
2 x 16" oscillating fans
1 x sugar & yeast co2 bucket
1 x 10000 BTU air conditioner (hopefully enough for both rooms)

The lights are ventilated inline, from the outside to the outside. We started with the two inline fans between the lights, but those didn't seem to move anywhere near 500 cfm worth of air. We since added the centrifugal fan at the exhaust point and the lights seem to be quite cool with two of the four lights currently on.

The room is ventilated by another 745 cfm centrifugal fan which intakes air from the far corner of the room and exhausts it into the vestibule with the A/C. The cooled air then is pulled back through a wall vent into the room, towards the intake again.

A water cooled co2 generator will be added in the future, but for now there will be a sugar and yeast fermentation bucket. I know it's not ideal, but it's better than nothing.



All that being said I have a few questions:

With the lighting ventilation, could the inline duct fans be impeding the centrifugal fan or are they helping it?

Is it necessary to pull fresh air into a sealed room when you add co2? If so, how often should the air be replaced?

I would like to hear from anyone with answers to my questions, or with ideas or tips that would apply to my situation. I posted a couple of pictures below, I'll try to add more soon, maybe along with a video.

Nobody???

I've been having problems getting the heat down in the room, any help would really be appreciated. I attached a drawing of the layout below.

The room only has two lights on (the left two in the diagram), and it's staying about 82 F under the lights and ambient temperature is about 77 F. Outside temps are about 80 F. The temperature has me stumped, the lights are relatively well ventilated and there's a 10k btu A/C and the temp is still seemingly out of control.

Looks great, pro to say the least. Very well planned. I've looked at your setup, thought about different ways to set your venting. This is what I came up with.

I think you can make more use of the 3 fans you have. I could be wrong, but having your 500cfm fan within 5 feet of your active exhaust fan probably doesn't use it either to their full potential. Plus your other 500 closer to the passive intake should help. Or if possible, instead of outdoor intake, I'm sure your basement is cooler. Run the intake from a different room. That idea probably won't work if you need stealth at all. Just my thoughts.

Have a look at my grow journal I have a blurb on how I ventilate my 2000watt tents, a little different way of doing things.

I've been thinking of getting rid of the 500 cfm fans altogether. They're only there because they were going to be the only fans, but they weren't enough so I added the centrifugal. Could the inline fans just be slowing airflow? Also, I have another centrifugal fan, would it help to add that to the same line of ducting or would it be better to just run two runs of two lights each?

BTW, thanks for the ideas.

you are venting air through the lights wrong, its hard to pull in a circle like that, try leaving one end of each row of lights open pulling air from the grow room through the lights in to a the lamp exhaust fan pulling air out to the outside atmosphere. you can then concentrate on the room temperature with your intake and exhaust fans.
also in the first picture, what is the duct that runs along the ceiling doing, if that is venting in, it is too high, lower the open end to the floor, and exhaust out at ceiling level? if it is venting out, where is the carbon filter?
if you are going to use co2, exhaust in 2 the two lights using two ducts at the far end of the row, sucking with another fan it this end in a instead of i circle, that is where the problem lies, by the time the air gets to the exhaust fan it is very hot/warm and the exhaust fan is struggling with warm hard to pull air being driven round in a circle like that.

good job there........

i claim to be no expert but it doesnt really make sense that your intake and outtake are right beside each other? it seems as if outtake would blow hot air out right beside the intake wich would just push it back in?

I would do two runs of two lights, that is too much for 1 fan.

I would like to do runs of two lights, but with room the logistics would be difficult. I'm going to try to find a way to do runs of two lights if possible.

Also going to be adding a Hydrogen Pro co2 generator in about a week so the higher temps will be a good thing.

Just thought I'd post some updated pictures: (the bigger plants are about 5 weeks from cutting)

lovely grow room. a job well done.