Setting a sealed 20x30 built inside of a closed metal building

stronggenetics

stronggenetics

Well-Known Member
Hello everyone I’m a long time lurker on here but don’t post much. I’m in the process of building a 20x30 room that is split into a 20x20 and a 20x10 it has 9.5 foot ceilings. It is a sealed room and I have enjoyed building it so far. I recently got the walls up and the plywood on now I am about to do the ceiling. My current plan is to do 3 rows of 4 1000 watt lights/12 lights total, my question is about the rough size of dehumidifier id need. I’ve been looking at quest. The other is about cooling, if I run standard hps not Gavita or de bulbs should I be ok with a 5 or 6 ton ac? Or would I need to go air cooled at that size ac? I will be running co2. It gets hot in the Oklahoma summers
 
Renfro

Renfro

Well-Known Member
AC is easy, half a ton per light. Then add in other loads like CO2 generator and such.

The dehumidifier will depend a lot on biomass in the room. I would go with this in the flowering room

https://www.usephoenix.com/phoenix-300-max-lgr-dehumidifier/

Shouldn't need a dehuey in the veg room.

The 30x20 room with only 12 lights will be underlit unless you are only growing in part of the room. I would be looking at a 6 x 4 layout in there with the 1kW DE's. So were it me I would have 24 lights. So 12 tons of AC for lights and a couple more for the dehuey heat and CO2 generator heat. If the room is inside and well insulated I would think 14 to 15 tons will work. I would want the AC to run when it's cold outside so spec low ambient operation.
 
stronggenetics

stronggenetics

Well-Known Member
Thank you so much that is great info. I knew the 12 lights were kinda low but I have to start around that size then after a run or two I will have my power upgraded to the building for more amps. Also I’ve grown for about ten years but always in bedrooms or garages with only about 4 lights. So starting a little smaller will be nice for me to get used to things at a little bigger level. I will look into the de lights more I love the idea of them but was just worried about the heat.
 
stronggenetics

stronggenetics

Well-Known Member
stronggenetics said:
Thank you so much that is great info. I knew the 12 lights were kinda low but I have to start around that size then after a run or two I will have my power upgraded to the building for more amps. Also I’ve grown for about ten years but always in bedrooms or garages with only about 4 lights. So starting a little smaller will be nice for me to get used to things at a little bigger level. I will look into the de lights more I love the idea of them but was just worried about the heat.
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Renfro said:
Well plan for 24 and that way all you gotta do later is add another AC unit and more lights.
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The flower room will only be 20x20 the veg is 10x 20 sorry I reread your post and realized you thought I was putting the 12 lights over a 30x20 area. I’m going to have a 5ton ac and I’m gonna go with single ended bulbs at first due to budget. The reason I was going to get the quest dehumidifier is because I found a site where I could finance it instead of needing all the money at first. Last night I got the ceiling on it’s made from 20ft 2x6s I’ve done everything solo so far but now I need to get the 4x8 sheets of plywood up for the ceiling gonna have to get help for that. I like the de lights and will upgrade to those as soon as I can. Maybe I can run the de lights after summers over and run them this fall/winter since it’s only a 5ton ac and then upgrade my ac before next summer.
 
Renfro

Renfro

Well-Known Member
20 foot span, 2x6 and the weight of plywood? Did you have an engineer look at this plan?
 
stronggenetics

stronggenetics

Well-Known Member
Renfro said:
20 foot span, 2x6 and the weight of plywood? Did you have an engineer look at this plan?
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Ventryjr said:
Do you have any center support for your ceiling? 20ft span with 2x6 will barely support itself with out sag. 10ft is about the max free span for 2x6. Just trying to help out.


Great thinking and thanks for the heads up Incase I didn’t know that. My dad is a builder so he did the math on exactly what I would need. He’s going to help me add a main beam across the top of the 2x6s that attach to each and then anchor to the main metal support beam from the building that they are inside of. That way I can suck the sag out of the roof and get it perfect.
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Renfro

Renfro

Well-Known Member
Well as long as you had a building permit and inspection then you should be good to go.
 
stronggenetics

stronggenetics

Well-Known Member
nxsov180db said:
Is this room being built inside of a larger building? If so I would run a few LVL's across the top along the length of the room in the center and use straps or ties to hold those 2x6's up..
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That’s basically what I’m doing, I have a beam going across the top of the 2x6s that connect to each one then to the metal beam at the top of the building. Great tip
 
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