Cab Grow fan cycle problems

M

munch box

Well-Known Member
I am right now trying to find out the best way to keep my cab cool and still be able to have co2 blow around? The problem i've been having is that my climate controller is putting my fan cycles too close together. not allowing my co2 to do its work. right now the cyle is 12 min fans off _ 4 min fans on. the fans are activated automatically by temp/humd rise. MY QUESTION is does anybody know if it is good to allow a constant intake fan into the cab which is air tight, thus expanding the walls cuz air has nowhere to go? cuz I noticed a huge change in fan cycles to 10 min. exhaust fan on- 50 min off. If i do this will it be more beneficial to my plants? Is the co2 just being forced to the top of the grow box or is it being bounced around inside?
 
M

munch box

Well-Known Member
this is the door i created to make my room air tight not to allow any co2 to escape.When i turn just my intake on and not my exhaust. the zipper door i made blows up like a baloon, not allowing much air to escape. just a little through the zipper cracks, but thats it. Is that a good way to save co2?
 

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pandabear

pandabear

Well-Known Member
why dont u try to exhaust the air out of your reflector. if i am looking at your setup right the air is pulled into a duct that goes through the light and back out the other duct outside the box right?


if it was lke that it should be cool enough in there to run your c02 without the fans right?
 
pandabear

pandabear

Well-Known Member
ok i get it now u have ducting on both ends of your light that meet at the top to make one duct outlet for exhaust,

this is your solution:


take the duct on one side of your light and have it coming out the top of your grow box, then take the other duct on the other side of the light and have it coming out the grow box also on the other side.

then u put a fan exhaust on one of the duct ends and it will suck air from the outside room in through your duct and past the light and exhaust it right back out into the room outside of the box through the other duct, therefore your grow chamber be still and c02 inriched with minimal c02 loss
 
M

munch box

Well-Known Member
thats what i am doing.
I am using cold air from outside, and cooling the light down, and on the other end of the ducting i have a 200cfm inline fan pulling air through the reflector. and my room is still too hot.
 

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M

munch box

Well-Known Member
the end of the fan cycle brings the temp down to 80 up top and 82 below the 400w. the temp slowly rises as fresh air is pushed in through the bottom, over 50 minutes time the temp goes up to 87 above the light and 95 below the light. this triggers a 10 mintute fan cycle. If i leave both the intake and the exhaust off the temp. will rise much faster, about 10-12 mins. will trigger a fan cycle.
 
pandabear

pandabear

Well-Known Member
you may be trying to do too much and physics wont allow it, your only solution is to bite the bullet and put some more $$$ down waste c02 while using it

or just dont use the c02 anymore and be done with it. i mean other than that get a smaller light but that makes no sense when the light is better than c02

i have a c02 tank not on a controller but i would let off a bunch of c02 for my plants everynight and man they kept gettin taller and taller. i think the c02 will make them grow a lot taller too which is not good for your setup.

anyway after that i dont even use my c02 tank i just let plants just grow el natural & get atleast 1 gram per watt

my tank just collecting dust in the closet
 
M

munch box

Well-Known Member
ya maybe. i don't pay for my electricity, so i try to leave the fans off as much as possable, to avoid detection. co2 allows me to do that as well as give me better results- hopefully. All i really want to know is if odors are not an issue (ozone gen.), could i keep a constant intake fan blowing air in a 99.5% air tight room or would be harmful to the plants because the air in the room would be somewhat "pressurized" with no where to go. do you get what i am saying pandabear? my climate controller automatically shuts off my co2 system while the fan cycle is running so i don't waste co2.
 
pandabear

pandabear

Well-Known Member
yea if u have intake blowing in there and it puffs up your grow box that is fine for the plants in reality all the air getting blowin in there is also leaking out, it like blowin in a bottle u cant blow air into a bottle unless it can come out somhow so your co2 will be leaking out with the rest of the leaking air.

i used to have a grow tent i made out of a shelf and light tight plastic and it would also puff up real nice when my intake was running. i didnt even need an exhaust
 
M

munch box

Well-Known Member
ya i hear ya . its not 100% air tite though. I know i will be leaking some co2, but it seems to cool the room down 5x as long. -the only other way would be to keep running 4 min fan cycles follwed by 12 min of only my circulation fan and co2. 12 min is barely enuoph time to fill the room with co2 before it then gets pumped out very quickly and becomes lost money.
 
daddychrisg

daddychrisg

Well-Known Member
It looks like you need to kick your light down two a 250w...or you can buy a speed controller for your fan, and have it running all the time at a lower speed. How well does your reflector seal up? You can go as far as putting silicon along the edges around the glass, this would keep co2 from being pulled out. With such a small space, you will probably need your exhast fan running full time while the light is on. You can also toss in a block of ice to cool the grow box...Hmm, I am sure there is alot of ways to make your situation "better". Think out of the box...
 
M

munch box

Well-Known Member
Why does my grow area need a exhaust fan running constantly while i am using co2? I can keep the room temp down and feed my plants co2 for 50 min. just by running an intake fan, the air escapes through very small cracks and also through the zipper.
 
M

munch box

Well-Known Member
look at the picture. the grill fan with air filter is blowing very cold air up into the grow space and then the circulation fan blows that cold air directly up to the light glass cooling the room down 5x longer than if the intake was off. THE QUESTION ONCE AGAIN is Can healthy plants be grown in "pressurized" rooms full of co2?
 
pandabear

pandabear

Well-Known Member
munch box i hate to say it but you should get a bigger cab

this one may not be as pretty but has way more room, i use it for my moms and clones

for my mother and for cloning my next batch, i have it in my closet which is also the flowering room,
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you will have to line it with light tight plastic though
 
M

munch box

Well-Known Member
that cab there is smaller than mine. my cab is 2 x 3.5 x 6. i can't find the specs for that cab there, but its not as wide it seems.
 
pandabear

pandabear

Well-Known Member
yea your right, its only 28" wide but i got it cuz thats all the room I had. you can get bigger ones. the problem is that yours is 6 ft tall but your not using all that 6 foot.

i was thinking why dont you gut the bottom of your grow box thing and then just glue the drawer faces on there to make it look like the drawers are functional but in reality there would be grow space behind them giving you lots more room.

you prolly would wanna make the faces of the drawers removable too so you have easy asscess to work on your babies
 
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