300CFM 3x3x7 Room Still 90+deg

My setup was fine when it was the winter time. Now that ambient temps are around 80, it doesnt seem like my ventilation setup is enough to keep temps down.

Heres pics of my room, I have 1 6 in S&P fan pulling air through the carbon filter to the light, and exhausting at the very top of my room. The ceiling of the room is slanted, as its underneath stairs. My temps are 90+ depending how low I have my light. The fan is 300CFM so i thought it would easily be enough to keep temps down.

The last picture shows the intake, its basicly one of those air vents that I poked through the wall, put some insulated duct and bent it 90 degrees as a light trap, aimed it towards the wall. I put a small walmart fan inside as a powered intake

Just moving air won't keep your temps down. A little thing we call Thermodynamics gets in the way. You need to run cooler air into the grow room. I made a plastic tube out of garbage bags and attached it to my AC vent, and ran it to my closet to help keep temps where I want them.

Alternatively, you can start pumping in CO2 to help with plant respiration in those higher temps. They like that.

Its going to be difficult for me to route a/c into the room, I wouldnt even know how to start running hoses through the ceilings and walls.

As far as co2, Ive considered it, but my fan is on all the time, and its supposed to be a very high cfm for the size of the room, would that be pointless then?

Depends on where you're getting a refresh of air. I didn't run any hoses thru walls or anything, just make a tube out of plastic bags and tape it along the ceiling and walls until it's where your room can bring the cooler air in.

As for the fan making CO2 a waste, this is likely depending upon your setup. I'd have to see EVERYTHING to be able to give you any decent assessment.

Here is a picture of my setup. My temps with the door closed went to 95, scary.

Running a hose isnt an option, as my room sits out in the living room, and it needs to be stealth. Unless its through the walls.

I would do c02 if I could, though I also heard its best to purchase the 20lb tanks and I dont think I have room for that

the second picture shows the room w the door closed, left is the stairs which curve around above the room. The right wall is where I installed the intake, and covered it with furniture.

KaliKitsune said:

Just moving air won't keep your temps down. A little thing we call Thermodynamics gets in the way. You need to run cooler air into the grow room. I made a plastic tube out of garbage bags and attached it to my AC vent, and ran it to my closet to help keep temps where I want them.

Alternatively, you can start pumping in CO2 to help with plant respiration in those higher temps. They like that.

Click to expand...

wow thats crazy dude, i was just reading about thermodynamics, and air flow and shit like that , them come on this thread a read this........cool im on the right track on figuring out my heat, plus those S&P fans are rated for just the fan, start adding filters ,ducting and it cut CFM'S in half or more.....

I just took a look and those pics and i have some questions. Is the air flowing through the light hood coming from the room or is it connected to the grill above the door. are you pushing or pulling air with your fan? Does the air above the hood have any flow or are you trying to pull the air in the top of the room through your hood?

The fan is pushing air. The carbon filter is attached directly to the fan, which is blowing air past the lights and up through the ducting and coming up and out at the very top of the room

There is no air above the hood besides the small fan I attached to the shelf thats blowing down on top of the plants

OneHit said:

The fan is pushing air. The carbon filter is attached directly to the fan, which is blowing air past the lights and up through the ducting and coming up and out at the very top of the room

There is no air above the hood besides the small fan I attached to the shelf thats blowing down on top of the plants

Click to expand...

You might need a bigger fan Im not that smart I would never even know how to use the term thermodynamics but if you could take the bends of out of you ducting or make them as far apart as you can .option 2 get a bigger fan. option 3 make a bigger room for the ladies so the heat has more space (and time)to dissipate 3x3 ,oh and the fans that are blowing the heat from the light down on your plants have to be a bad thing ,, Im dealing with a heat prob of my own , so I hope this helps

You have to have some sort of cool air intake, or some means of refreshing the closet air with cooler air, somehow. otherwise no heat is removed from the system and it just builds up.

GO in the attic....cut a 4 inch diameter hole in your AC and drill a 4 inch hole in the top of your room and connect it. You gotta have A/C if you are not growing during winter.

hook the intake to the grill above the door cut a hole in the celing to vent into if there is a way to tie into duct work go for it it is easily fixable. so are holes for that matter.

thesyncopater said:

if you are pushing air out of the room then air has to be coming from somewhere; if you have a fan pulling air out and another fan just circulating you might not get as much ventilation as you'd hope. the air is seeping in from the cracks in the door (not good flow). your plants still look good though!

Click to expand...

my current setup does this. heat has been a problem for me during the summer. i grow in a basement, but on the opposite side of the grow tent (approx 20 feet) is a small crawl space that goes under a room that's divided from the rest of the basement which has cool air. how could i use this cool air to cool my setup?

somebody041 said:

my current setup does this. heat has been a problem for me during the summer. i grow in a basement, but on the opposite side of the grow tent (approx 20 feet) is a small crawl space that goes under a room that's divided from the rest of the basement which has cool air. how could i use this cool air to cool my setup?

Click to expand...

Run some sort of ducting with a fan at the end of it, put the fan in the cool room, have it blow cool air thru the ducting into your grow tent.

So is the vent above the door there hooked up to your ac? if so, cut out an access area in the ceiling and tap into that.

Well the air does exhaust. The hood itself isnt very hot, its the glass thats hot. I did read that the thinner the glass, the less IR accumulates in the glass, so theres less heat trapped. Though I got HTG's system. Anyone else notice that?

syncopater, there is an intake, THe last picture of my first post was the intake. Its a 6 inch duct connected to right outside the room to an air vent, I bent the duct 90 degrees as a light trap, and i put a small walmart axial fan in there to promote airflow.

goodstuff, no attic, I live in a condo. RIght above the ceiling for the room is the stairs...

Kali is there a tiny a/c system I can hook up into the room and hang? You notice my room is small, normally I keep 4 plants in there, so I only have airspace, not groundspace.

i'd get another S & P 6 inch fan for just the light (seal it up ) n keep the other for strictly the carbon filter. between the two fans you can find a balance between the two for the right temps.

ya they make portable a/c units that have slots for flex ducting to exhaust the heat coming off those...portables suk for big enclosures...but reall that might be the ticket for u..look at hydrofarm.com...then go to homedepot and lowes..and compare..u can run a Y off ur current exhaust fan and pull air and a/c exhaust out of that 6'' ehaust fan..the portable will fit inside ur op...and u can run the ducting w/o cutting any more holes. like everyones said..in that small area...shits gonna heat up no matter how much ur exhaust pulls..u must bring cooler air in...its summer time and 80% of us are scrambling to start cooling our ops..me included...ive had nightmares..of recent with heat...im runnin 10,000btu of a/c 180cfm of intake from fresh air...300cfms of exhaust..and im sittn at 75 finally..still have kinks..because i dont want my a/c on 12 st8 hours a day..plus im using a window a/c unit, which heats the living fuck out of the garage its facing....so ya summer here we come...but i believe a portable will solve ur immediate mission.

So i can see where your intake is and you say you have a fan pulling down there. Where is the exhaust out of the room? You have a few things going right now that are killing the CFM of the big fan. 1. You should be pulling not pushing air. I know that with your carbon filter setup you have to push air through it. Bummer. 2. You have a few bends that prohibit proper flow. 3. That fan works best when it is horizontal, not a 45 degree angle. I really want to know how you are expelling that hot air coming off the bulb out of the room. It sounds like its just sitting in the room.