First grow, plants are coming along nicely. However its freaking hot in my room, 98-100 and that is with 2 portable ac units blowing in. the ac units are not pulling air from inside the grow room, they are in the other room. I think the ac units are creating a positive pressure issue due to excess air and no exhaust. I am using a scrubber for c02. but the positive pressure is making the c02 leave the room pretty quickly plus smell. I am building another room for veg and dry. I was thinking, If I vent into my flower room, and vice versa, vent from my flower room to my veg room, would that solve the pressure problem and spread around the c02 between the rooms? plus may help with heat? Attached is my current floorplan, and an idea. Thank you.
Positive pressure and heat issue
- Thread starter sammyg118
- Start date
jondamon
Well-Known Member
My honest answer to you is to air cool all of your lights.
Use an independent system
ie cool air duct from external source into room via ducting through air cooled hoods and out of the room. No air from within the room enters the lighting rig.
you’re running a whole lot of lighting power for just AC to deal with.
this way your heat leaves via the air cooled system and doesn’t enter the environment.
then your AC won’t have to work as hard to hold temps.
Use an independent system
ie cool air duct from external source into room via ducting through air cooled hoods and out of the room. No air from within the room enters the lighting rig.
you’re running a whole lot of lighting power for just AC to deal with.
this way your heat leaves via the air cooled system and doesn’t enter the environment.
then your AC won’t have to work as hard to hold temps.
HydroKid239
Well-Known Member
Noob disclaimer: I don't know the first thing about dialing in an entire room, but I read a lot.
I didn't discriminate on the articles on rooms, so I picked up a few things.
My questions are..
Can he seal the room, and set up intake from one of the AC's thru the cool tube like this below..
1x AC outside with ducking bringing it in--> same ducting connected to cool tubes --> ducting leaving the room?
That would involve several more duct booster fans.
and
1x AC to blow cool air into the room having to work half as hard doing so?
I'm toasted, and full as hell. Hope everyone had a nice dinner.
Would be a great idea if it could work, my lights only have an exhaust not a cold air intake. I have the dimlux lights. Any ideas on how to connect 6 lights to a exhaust duct? The exhaust holes are 2 inches so I would need to run them into a master 6 or 8 inch duct. But would exhausting the air from the lights make my room not sealed?
HydroKid239
Well-Known Member
I'm not sure you really wanna vent the humid air from a veg room into a flower room.
Wouldn't that have you battling humidity in the flower room?
Wouldn't that have you battling humidity in the flower room?
Humidity has not been an issue, it has been below 50% the whole time in the flower room, I even had to use a humidifier a couple of days it dropped into the 30% range. maybe the heat+positive pressure has just been pushing the humidity out? I have 2 dehumidifiers anyway just in case
HydroKid239
Well-Known Member
30-40% is ok in late flower. I just think once a veg room is set up to vent air into the flower room... that RH is going to rise.
Im toasted too, right now I only have a veg room going into flower, the rh is too low. Im going to keep this room as the flower room and do the other room as veg. Yeah so maybe ill run a ac unit from the veg room into the flower room and extract back into same veg room. The air coming into flower room would have gone though ac so no Rh issue and extract for pressure issue. I dont think the ac would remove the c02. so the c02 would still be recirculating between two rooms.
The problem then would be keeping the veg room cool and the right pressure?
the ac too cool the tubes might be a good idea though, this is my light https://www.dimluxlighting.com/grow-lights/dimlux-1000-watt/ I have 4 of these and 2 of their cmh ones, all use the same ballast. As you can see it only has a 2 inch extraction tube on the top. Would it make any sense to run cold air through the master extraction tube? Would that even cool the lights at all or just be wasted trying to cool the hot air thats getting extracted out the room anyway? Also what would that mean for the seal. Has potential
HydroKid239
Well-Known Member
How big are these rooms? Are you using just enough lights to cover the spread as even as possible? It seems like overkill unless the rooms are pretty big. 1000w build covers what.. 5x5 for flower? You got 4x 1000w in there and 2x 630w + LED?
The current room I am using is 180 sq feet. 18x10 and 10 foot ceilings.
The other room which I may use for veg is 120 sq feet so obv will use less lights although same amount of plants, since obv smaller pots until transplant.
Found this product, https://chillxchillers.com/accessories/hydro-innovations-ice-box-inline-heat-exchangers?sku=904490&gclid=Cj0KCQiAwf39BRCCARIsALXWETxdaeSyImLmS-F917lAme7fuNiaZAdJPqHvC-b-lucHp8I3jl0Kk7YaAraPEALw_wcB if it works as it says, I can run a completely sealed room with the possibility of not even needing ac. just use carbon filter as scrubber and good to go. Lets see how it works
jondamon
Well-Known Member
If the air hitting the lighting system is too cold it will condensate around the exhaust system and inevitably end up with either moisture build up inside or outside on the lighting rig (been there lol)
Personally I would not contemplate utilising this amount of lighting without the ability to air cool it all.
the OP is trying to recreate a sealed grow environment and control everything but without being able to control the amount of heat displaced from the lights.
If You don’t have air cooled hoods then the only other option is greater cooling capacity.
HOWEVER it’s easier/cheaper to remove heat from area than it is to dump more cooling in there to compensate.
What do you think of this? essentially air cooled but fully sealed https://chillxchillers.com/accessories/hydro-innovations-ice-box-inline-heat-exchangers?sku=904490&gclid=Cj0KCQiAwf39BRCCARIsALXWETxdaeSyImLmS-F917lAme7fuNiaZAdJPqHvC-b-lucHp8I3jl0Kk7YaAraPEALw_wcB
jondamon
Well-Known Member
That’s all well and good but you need more than just the item you linked.
I’ll bet you by the time you cost everything up that’s required to run the chiller equipment etc you’ll be up over $1000.