Big Room - Trying to figure best place for intake / exhaust

So I have a 9 x 22 x 7 basement I will be setting up in the coming weeks ...

Most likely two 4 x 4 or 5 x 5 flood tables, but my main question concerns my intake and exhaust fans. I'm not sure where I should put them.

Eventually the entire 9 x 22 part of the basement will be covered in panda film - stapled and duct taped in for a full seal.

Got a couple more pics of my room I will attach here shortly phone is not pulling them up on my photos at the moment.

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Edit: added a bunch more pics of the room so you all can see it from all angles

Will the intake be pulling from another room? If so, what's the temperature like in that room; and is it controlled? If pulling air from outside, what's the temperature like year-round?

Not controlled no. I'm still unsure on if i should build a wall where there is an opening to my room and add a door so I can seal the room or if I just have good fan airflow in the room if it will all be fine.

It's a basement so it never gets warmer than like 65 degrees max down there.

Looks like you are pretty limited.

Are you looking to just blow the hot air upstairs?

Possibly yes

That or i'm wondering about exhausting into my furnace room - dunno if this would be an issue or not just a very early idea.

Also looking at splitting into my dryer exhaust and using that, although this looks to be possibly dangerous as well.

MidWestMayhem said:

So I have a 9 x 22 x 7 basement I will be setting up in the coming weeks ...

Most likely two 4 x 4 or 5 x 5 flood tables, but my main question concerns my intake and exhaust fans. I'm not sure where I should put them.

Eventually the entire 9 x 22 part of the basement will be covered in panda film - stapled and duct taped in for a full seal.

Got a couple more pics of my room I will attach here shortly phone is not pulling them up on my photos at the moment.

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Edit: added a bunch more pics of the room so you all can see it from all angles

Click to expand...

Are you against keeping it sealed and running a little co2 and just scrubbing air?

No I could consider that, I've just never run co2, and I won't be running a 9x22 grow space, but the room will be that big - i'll do maybe 32 - 50 sq ft of growing area. Not sure if all the extra space would cause issues with me having to run alot more co2 than I would need or whatever. Maybe i'll look into that a bit.

Just kinda scared with co2, never used and don't know a ton about it - but I guess I never knew anything about a lot of this at one point ...

As to the scrubbing air part - what would I use? Can I use carbon filters if I don't have an exhaust?

If you can put enough AC in there, say a minisplit, then you can run a CO2 generator off your natural gas or propane provided you can tap into the gas line.

MidWestMayhem said:

No I could consider that, I've just never run co2, and I won't be running a 9x22 grow space, but the room will be that big - i'll do maybe 32 - 50 sq ft of growing area. Not sure if all the extra space would cause issues with me having to run alot more co2 than I would need or whatever. Maybe i'll look into that a bit.

Just kinda scared with co2, never used and don't know a ton about it - but I guess I never knew anything about a lot of this at one point ...

As to the scrubbing air part - what would I use? Can I use carbon filters if I don't have an exhaust?

Click to expand...

A scrubber is just a carbon filter with a blower. just filters the air in the room by sucking it through the filter and blowing it back into the room. I use scrubbers and I set them up so they also provide air circulation where I need it.

CO2 is awesome. Don't be afraid. Get a good controller like Autopilot makes. For an area like that id go with a co2 generator, natural gas if you have it plumbed into the home otherwise propane. You will have some extra heat to cool, but they don't run all the time, only as needed based on the controller.

Can’t really tell if you have access to and between your floor joists in the ceiling. Seems you have a finished ceiling. So you would want to maintain that to seal in sound and odors from the upstairs.

The wall that has the loose painted paneling just leaning against the wall may be an option for an exhaust exit but the studs look a little small.

Unsure of the exterior orientation of that room facing adjoining properties. Don’t want to exhaust noise and possible odors into the neighbors driveway....

If that isn’t an option, may think about installing a second dryer vent next to the one already in place. Use a filtered scrubber in the OP room then filter the exhaust again out the new dryer vent.

Regulate your heat via sensor hooked to your fan and speed controller to pull small amounts or possibly continuous amounts of fresh and cooler air into the OP.

With flood tables are going to create a lot of humidity that may also be controlled by exhausting the air. The cooler fresh air isn’t bad unless like I said before, you are going with a completely sealed room. Even at that you could put in an intake damper for fresh air to enter the room and only open when you run the exhaust.

Being that the basement temps are in the 60’s and depending on the heat output of your lights, you could possibly use the basement as a air mixing room. May work with lower temp LEDs

Still a lot of variables

Intake at ground level for coolest air, exhaust up high. I'd suggest looking into a big tent, or framing a dedicated growing area. It'll be easier to environmentally control, say a 5x10 area, then the whole room. At least that was my experience. I went from a 12x8x7 room to 2 5x5 tents, on shared environmental controls, and I can control my temps much better. YMMV.

Renfro said:

If you can put enough AC in there, say a minisplit, then you can run a CO2 generator off your natural gas or propane provided you can tap into the gas line.

A scrubber is just a carbon filter with a blower. just filters the air in the room by sucking it through the filter and blowing it back into the room. I use scrubbers and I set them up so they also provide air circulation where I need it.

CO2 is awesome. Don't be afraid. Get a good controller like Autopilot makes. For an area like that id go with a co2 generator, natural gas if you have it plumbed into the home otherwise propane. You will have some extra heat to cool, but they don't run all the time, only as needed based on the controller.

Click to expand...

I have a similar problem. I have a 16x17size room and I was thinking of just doing an exhaust and intake with the minisplit. I'm more worried about smell than having co2. I have in inline with carbon filter exhausted to the roof turbine vent. I wanted to keep a negative pressure and keep it smell proof. I also have a mini-split currently.

I'm worried if i do a sealed room with co2 and minisplit that the smell will leak out eventually even if there were carbon filters running.

aldeeznutz said:

I have a similar problem. I have a 16x17size room and I was thinking of just doing an exhaust and intake with the minisplit. I'm more worried about smell than having co2. I have in inline with carbon filter exhausted to the roof turbine vent. I wanted to keep a negative pressure and keep it smell proof. I also have a mini-split currently.

I'm worried if i do a sealed room with co2 and minisplit that the smell will leak out eventually even if there were carbon filters running.

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I hear ya, my house used to smell at the curb (thankfully I am in a legal state). I had to put two very large scrubbers in each of my flowering rooms, one in the veg room and one in my drying room. All my scrubbers are 48" tall phresh filters with 12" vortex blowers on them. This keeps it knocked down but when harvesting you can still smell it when you come in the house but my grow is rather large.

Renfro said:

I hear ya, my house used to smell at the curb (thankfully I am in a legal state). I had to put two very large scrubbers in each of my flowering rooms, one in the veg room and one in my drying room. All my scrubbers are 48" tall phresh filters with 12" vortex blowers on them. This keeps it knocked down but when harvesting you can still smell it when you come in the house but my grow is rather large.

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Will i be wasting co2 if im running an intake exhaust for 24hours with the a/c set at 80 degrees? You think i should just do the sealed room with co2 and two scrubbers instead of just having the exhaust with a lot of negative pressure? I'd love to hear your opinion...

Well with exhaust and negative pressure, near harvest your smell may overwhelm the exhaust filter and thus scrubbers may be required to help out.

If you are exhausting then you are not only wasting CO2 but Air Conditioning. If you must exhaust a good controller will stop CO2 enrichment when exhausting.

So for the best efficiency and security I'd go with sealed, AC, plenty of scrubbing and CO2.

Renfro said:

Well with exhaust and negative pressure, near harvest your smell may overwhelm the exhaust filter and thus scrubbers may be required to help out.

If you are exhausting then you are not only wasting CO2 but Air Conditioning. If you must exhaust a good controller will stop CO2 enrichment when exhausting.

So for the best efficiency and security I'd go with sealed, AC, plenty of scrubbing and CO2.

Click to expand...

Thanks a lot for your input! I will do that in my next cycle. Appreciate it brother

Agreed appreciate the input all, still unsure of exactly what i'm doing... been insanely busy this last week - hoping to work on the room through this next month or so.....So cold here have lost all motivation of will