Sealed rooms.....

[Nawshis]

Im upset that I cant run sealed .... at least right now .. my pockets aren't lined up enough

I dont even know what I can do with ventilation w/ this big ass hood pumpin out 1600w...

I got problems

 

[stke_fingas]

nawshis,
this isn't quite on the same scale but it is Co2 enriched. runs on a hourly cycle because it doesn't take much Co2 to bring up my ppm. vents for 15 min and bam! gets hit with the Co2 again with a 45 min soak.

flat out, hands down fastest growth i have seen. veg is about the same rate of growth as a stretch burst but without the stretch. plants are just blowing up!

day 9 of veg

bottle fed!

this is day 7 of veg.


i'm on day 10 of veg today and the screen is over half full.

 

[Nawshis]

nawshis,
this isn't quite on the same scale but it is Co2 enriched. runs on a hourly cycle because it doesn't take much Co2 to bring up my ppm. vents for 15 min and bam! gets hit with the Co2 again with a 45 min soak.

flat out, hands down fastest growth i have seen. veg is about the same rate of growth as a stretch burst but without the stretch. plants are just blowing up!

day 9 of veg

bottle fed!

this is day 7 of veg.


i'm on day 10 of veg today and the screen is over half full.

jeez.. thats impressive growth after only 10 days of veg.... good work!

 

[stke_fingas]

nawshis
thanks! it's some work keeping up with the training. i bet i'll have plenty o smoke when it's all said and done, so i don't mind a little extra attention. there is a lot more growth you can't see in those pics. i got some thick branches running along the bottom that i hope to stretch some 4"-5" branches off in the end. nodes are so tight with the CMH i might veg a little more to make sure i fill this whole screen up. if it was HPS i'd be flowering. my heart is racing thinking about thick nugs without space between them. trimming a little to make room is better than not having a full canopy IMO.

 

[yukino_asano]

controlled enviroment with co2 Rules!!!

is Cost effective if done right.

Mr Celcius! Your a ruler.

Quick question for you.

In your diagram on venting hoods. There isn't any indication of when the air comes in and goes out.

Is one fan intake and one fan exhuasting the hoods?

 

[pineappaloupe]

Mr C: The only humidity i would need to remove is from the plants. The ambient RH in the summer ranged from 5-40.

I am going to a sealed room after this harvest (days away!).

A few thoughts:

-are window AC units completely light tight?
-how sealed are we talking here. I have a large box, with a wooden door and installed zippers to make a door to through the BW poly.
-and is an air exchange really needed?

peace

 

[TGT]

Killbud, if you are taking air from outside to cool the lights you will have to exhaust outside also. If not you will have a build up of pressure in the room and your Co2 will find it's way out. I don't know if someone already said this as I have not read the whole thread. I have not slept and the screen is getting kind of blurry, so sorry if I just repeated what someone else said.

Nice set up from what I can see - it is going to be very impressive.

Edit: Forgot to ask, what size is your grow room and what size is your basement in total? Just curious as my set up I am doing is very similar, but instead I am using 4 -1000's and it is a semi-sealed room.

TGT

 

[Godless]

I listed what you need to do a sealed room:
1) GOOD A/c unit that is properly match to space and heat (I.E 4000k btu per 1k of HID lighting).
2) GOOD dehumidifier.
3) Carbon scrubber to deal with the smell... since you wont have negative pressure and constant scrubbing by exhausting heat, you'll need something to deal with the smell. Not ozone, i'll stop that one there.

At least 75w per sq ft.

One of the first things I learned about gardening a looong time ago was: A plant can only grow as fast as its limiting factor. Once you understand that, and what ratios of what you need, you'll know your answers... which I just gave you.

This thread is helping me figure out the best plan for my environment (current details here: http://www.icmag.com/ic/showthread.php?t=86226 - could still use some input on the overall plan there). Some questions:

1. Does the AC BTU formula that you present (4kBTU/1kHID) assume non air-cooled lights? I am trying to determine if I really need AC at all for a sealed space with 2 600W lights in cool tubes pulling air from outside the room and exhausting to the attic (6inch ducting with minimal bends and assume an appropriate CFM fan - any suggestions?).

2. If AC is deemed necessary, what are the options for a sealed room? Does a window AC vent out the inside air? What about a portable? Is a mini-split the only way to AC a sealed room?

3. In a sealed room, are people running a carbon scrubber taking air from inside the room and exhausting it back into the same space?

4. I am looking at two 3x3 E&F tables, so that is 66w per sq foot, so I guess that is not optimal for Co2 based on the 75w/sq ft mentioned above, but the added benefits of smell control, not having to pull in "dirty" air (bugs/fungi/dust/pollen - the latter are in high concentration in my area) and maximizing my yield without adding more bloom space/watts seem like they are pretty valuable benefits - agree?

Much thanks for any input/advice.

 

[ThereIsHope]

Hermetically sealed grow rooms don't exist. All this speculation about losses and oxygen this and that is pointless.

Run 1500ppm, 75w per sq ft of hid (at least), get the humidity to about 60-70% = massive growth. The humidity can cause bud rot, but much of this can be prevented by using potassium silicate ("baracade" or "silica blast").

Normal, fresh, outside air is around 300ppm-350ppm, if you are running 50w per sq ft of HID or less and/or have low humidity, then this ppm of Co2 will suffice.

I really wouldn't attempt a sealed room unless you have the proper equipment. In other words, at least 4000k btu of AC per 1000w of HID lighting, a good source for Co2 (burner or regulator that can handle your room), a GOOD dehumidifier (Co2 releases a lot of humidity) and a carbon scrubber to recirculate (smell). I highly suggest using effective cooling methods with your lights.

Minisplit AC units are optimal, but can be difficult to DIY install.

Here is an example of efficient cooling methods:

Bingo.

I have been using CO2 for years and learned the hard way. There are several ghetto set-ups to generate CO2 and they are all a waste of money and time. I tried Dry Ice, baking soda and vinegar, brewing beer (gives off CO2) and they all did not compare until I got the proper equipment (CO2 monitor /controller).

Now I just set my controller to 1500 PPMs of CO2 during lights-on and the growth is phenominal.

 

[yukino_asano]

Some questions:

1. Does the AC BTU formula that you present (4kBTU/1kHID) assume non air-cooled lights? I am trying to determine if I really need AC at all for a sealed space with 2 600W lights in cool tubes pulling air from outside the room and exhausting to the attic (6inch ducting with minimal bends and assume an appropriate CFM fan - any suggestions?).

the formula is for non air cooled lights.

2. If AC is deemed necessary, what are the options for a sealed room? Does a window AC vent out the inside air? What about a portable? Is a mini-split the only way to AC a sealed room?

windows ac can recirculate the air

porables are not very efficient and can exhuas the co2 and smell

3. In a sealed room, are people running a carbon scrubber taking air from inside the room and exhausting it back into the same space?

yes the carbon scrubber just filters the air in the room

4. I am looking at two 3x3 E&F tables, so that is 66w per sq foot, so I guess that is not optimal for Co2 based on the 75w/sq ft mentioned above, but the added benefits of smell control, not having to pull in "dirty" air (bugs/fungi/dust/pollen - the latter are in high concentration in my area) and maximizing my yield without adding more bloom space/watts seem like they are pretty valuable benefits - agree?

Agreed.

 

[Shcrews]

Searched and found this thread...

Searched and found this thread...

so Mr. C is recommending 75W per square foot before running CO2

I'm running a sealed room with AC, dimensions 10x10x8, with 4 KW (soon to be 5 KW). temps 75-85, humidity 50-60% with no dehuey...

in order to near the 75W mark, i would have to run at least 7 1000W lights...

this seems almost mind blowing to run that much light in a 10x10 sealed room..BTW i do not aircool my lights, I use the huge AdjustaWing hoods and keep them about 1 ft. from the canopy... The hoods would be almost touching, and with 1000's!!! I'm sure i would need a massive 3-ton AC or something ridiculous as well.



sooo i guess i am wondering if maybe that 75W/sq ft. figure may be a bit lofty for me to shoot for? i guess technically i have some walking space in my room so i'm not using the full 100 sq ft. but still, even 6KW seems kind of overkill..

I want to try CO2 but i need to make sure i am good to go... I have a tank but i dont want to drop $500 on a controller/regulator if my room isn't dialed in properly. I thought a 1000W for every 4x4sq ft. was good... am i wrong?

thanks and a bowl of kush for anybody who replies to this

 

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