Vented Hoods, Co2

Hey guys, New member and have some questions/need some input about my room. I did a search and didn't find my exact problem.

Specs

12/12 room
6 1000 monster vented hoods
Cap extreme controller
2 20 lb co2 bottles (controlled by cap)
1 scrubber/filter vented out a window

So right now I have my lights in 3 rows of 2 with an intake from outside the room from the next room. It is ran through the lights and then exhausts out the chimney. So my problems are

1 even though it has an intake outside of the room and goes out the chimney it still smells upstairs. Obviously the ducting isn't sealed (or the lights) and my chimney has cracks.

Is there are way to filter this?

2 since the ducting/lights (which ever) isn't sealed it takes the co2 out of the room.

Right now the fans only come on when the temp/humidity get high, but only one side of the lights are on (three) But when all 6 lights are on the 3 lightfans would probably have to stay on during the light cycle. Then the scrubber would only come on to clean the room and exhaust humidity. I would like to get to run the light fans without the smell coming upstairs and not use co2, but I have tried to seal up the lights/ducting but doesn't work.


Any help/suggestions would be appreciated.


ps I am in week 2 of flower and my plants seem to be doing great, can take some pics of my room if that would help. Just don't like the smell upstairs and would be good to save some money on co2

Here are some pics of my room so you guys can get a better idea of what I'm talking about. Basic setup

gr2 is the exhaust and gr3/4 is the intake

if you have the fans at the start of the ducting to push the air across the lights and out the chimney,your smell is not coming from the lights. any leaks will push air out of the ducting and into the growroom. if your fans are at the chimney and suck air in across the lights,it would also suck smell into the duct from the room. my guess is the smell is coming from the room itself

go on amazon and look up "bad air sponge"...i use a carbon filter, an ionic air purifier, and 2-3 air sponges to contain the smell in my house. carbon filters do not catch everything. i am guessing that youve grow is what you are smelling. put the sponges around where it smells now and wait 3 days...you should notice a difference. if the ionic air purifier is pricey, but its been the best addition to my set up.

Thanks for the responses. I have one carbon filter that vents the room to the outside, but only comes on when the temp/humidity gets to high. I was thinking of adding another filter that cycles in the room for the "scrubbing" effect 24/7. Maybe the cap ozone also???

Madcow if you look at the last pic you can see where my fans are mounted, they are on the right set of lights. Sucking our from the intake and the pushing across the lights out the chimney. I have checked everywhere with my hand and can't feel any major leaks. I have taped up everywhere a leak could be. The smell kicks in upstairs exactly when the fans turn on and the co2 starts to drop.
One thing I was thinking would be a fan controller to keep the light fans running all the time.

Maybe this would help with keeping the co2 in and not get a big wind gust of smell upstairs?

the only leaks that would cause smell in the house would be in the ducting before the fans.any leaks after the fan will blow air into the room. can you move the fans outside of the grow to the very begining of the loop. is the smell around in the room that you get your air from? could you be sucking it in before the ducting?

If you look at the 3rd pic you can see how the fans are mounted to the lights and they pull air through the intake wall (air from another room) then push the air through the fans then down to the chimney (2nd pic) I don't feel anything being sucked before the fan meets the lights but I guess it could be right where the ducting meets the wall for the intake. I have checked all around there and don't feel anything

A couple ideas I have are get a fan controller and turn the fans down to half or less

1 remove the ducting from the back part of the fans to the chimney and just let it suck fresh/cool air in and then only use the exhaust/scrubber to vent the heat out. Kinda worried about sucking air in though, suck in bugs and shit.

2 remove all the ducting and just keep the fans on the lights blowing the heat out of the lights at low rpm

Both should save on co2 and then no smell would be pushed up the chimney. The air going outside the window has a filter to exhaust

In my CO2 set up 12x12x10 room, I had a 1025 CFM carbon filter, with a 8" 700 cfm fan on top of it, just running in the corner recirculating room air. You can tell the difference in odor immediately. I don't even keep negative pressure in the room. To cool my lights I have an intake from one side of my basement to the other, recirculating basement air, so that air never touches the inside of the room. Depending on your temps, you might need to either exhaust somewhere else, or find a way to bring in colder air, but this works for me. Definitely want to keep a filter on 24/7. A recent change I made to get some CO2 to my veg across the room was to vent my carbon filter to exhaust in my veg. I use natural gas supplied CO2 so I don't care about the cost, but with my filter across the room from my gen, it hardly seems to be wasting. Running tanks however, any waste is too much.

Definitely keep the exhaust that controls temp going, and run a 2nd seperate filter constant. Stuff like ONA or whatever is only good for supplimenting. Never tried ozone, but have heard mixed reviews. However I've never needed to, Carbon does the job well.

Well I think I found out the problem... The 3 light fans I have are 745cfm each and at full blast that just seems like way to much. When I took off the exhaust in the pressure was so strong it pushed the door open haha. I think what was happening was, the wall/door that the intake on isn't sealed and I think the intake was actually sucking air in from the grow room. Meaning the intake was sucking the air inside the room through the wall/door outside up into the intake. If that makes sense.


So what I did was just got a fan controller and turned the light fans to low and just having them run constant with the lights being on. Still having the exhaust/scrubber vent the heat/humidity outside.

roidrag I will def get another small scrubber that just cleans the air. The smell isn't that bad, was just bad coming out the chimney when the fans turned on. But only on week 2 and only half the room is full


Thanks for the replies/tips. Plants are on week 2 of flower and are looking good. In like 2 weeks gonna add 8 sour diesels on the left side with my room in the ebb monster 5 gal buckets. Can't wait to see how big those get