Setting up 15'x15'x9' "sealed" room, hydro - ventilation related!

Good evening!

I currently have two 15x15x8' rooms completed other than the ventilation; one is where I will be keeping all my big mechanical items & nutrient water (Quest 105, Eco Plus .5hp water chiller, nutrient doser, epicenter & rez) and that's being treated by a 9000btu Daikin minisplit. My flower room has minimal mechanical stuff; (6 LED's on LightRail light movers, 2 Hurricane fans, Co2 delivery & sensors / hydroponic pumps - using the CCh2o 12xl system) treated by a 15,000btu Daikin minisplit. I also have an RO system that will be supplying all the water. It's pretty much fully automated! All of that is rather trivial to my actual question but I wanted to make sure that information was available if relevant to exhaust. My plan is to use the conditioned air from the first room to supply the flowering room with an intake either from the Quest 105 or whatever makes sense - I'll be growing entirely during the winters in New England and would like to be able to MAYBE bring in some of the cold air in the final stages of flowering from outdoors (my minisplits only go down to 64 for night temps).

My question is this: What do I need in order to properly run a sealed set up like this? Should I be using the intake fan portion on the Quest 105 to introduce fresh, clean air & run a small exhaust fan outdoors? Should I not use the quest 105's built in vent feature? I'm so damn lost & information regarding this is pretty hard to come by since most people do their own thing in sooooo many different ways! I've also scoured the internet for information pertaining directly to "sealed" rooms and found a lot of people use hybrid systems and don't just fully seal their room (at this point, however, my rooms are completely sealed).

I'm currently pheno hunting & set on running only one strain at a time (and perfecting it as long as I can) - first up is Gorilla Glue #4. I've seen information saying that this type of setup is viable for honing in on specific strains. I'm not about quantity, but much prefer high quality. I'm trying to grow with minimal footprint.

Looking for clarification from someone who's built similar setups!

Thanks friends!
-Drew

Sounds like you are looking at a lung room setup. You air condition and dehumidify and co2 enrich the lung room, the growing rooms pull air from the lung room using blowers and return it to the lung room. Pretty simple. Generally you want a CFM thats capable of turning the room over once every 2 minutes or better.

I have found that in lung room setups a push pull blower system is the most efficient. Judging from the size of the rooms I would be running Vortex VTX-1200 blowers to move that air. A VTX-1000 would maybe work but I would go with the 12 inchers. Pull cool air from down low in the lung room and blow it into the grow space. Pull hot air from the top of the grow space and blow it back into the lung room. Keep the two ducts separated enough that they don't recycle.

The dehumidifier will kick on and off as needed to keep the lung room RH% where you want it, it should not be relied on to circulate the air, just dehumidify it.

Renfro said:

Sounds like you are looking at a lung room setup. You air condition and dehumidify and co2 enrich the lung room, the growing rooms pull air from the lung room using blowers and return it to the lung room. Pretty simple. Generally you want a CFM thats capable of turning the room over once every 2 minutes or better.

I have found that in lung room setups a push pull blower system is the most efficient. Judging from the size of the rooms I would be running Vortex VTX-1200 blowers to move that air. A VTX-1000 would maybe work but I would go with the 12 inchers. Pull cool air from down low in the lung room and blow it into the grow space. Pull hot air from the top of the grow space and blow it back into the lung room. Keep the two ducts separated enough that they don't recycle.

The dehumidifier will kick on and off as needed to keep the lung room RH% where you want it, it should not be relied on to circulate the air, just dehumidify it.

Click to expand...

Wouldn't that be putting toxic levels of Co2 into the room I don't use for flowering, though? If my rez & epicenter wasn't in there I wouldn't mind, but I also have a flood table for vegging in there along with all my climate controls, so I need to be able to access it without bringing in contaminants or hurting my own health. At the end of flowering I'll be dropping the Co2 altogether and not introducing any fresh air so there won't be any oxygen which will make it worse for me to enter if both those rooms have essentially the same air quality. I could be wrong, but I've heard some horror stories! I'm under the impression I only need a small amount of negative pressure in the flower room & the Co2 loss would be negligible if vented properly outside.

I'm trying to do a hybrid sealed room, so I mean I could absolutely use your idea of introducing a lower intake fan in my first room into the 2nd & then an exhaust fan somewhere high in the flower room to outside. I really don't want to be pushing any air back into room A though!

Totally on board with not using the Quest to vent fresh air in, I'll take you up on that.

Thank you for the response Renfro! Would love more input, there's only one thing I don't want to mess up on that I can't really "dial in" after it's installed - venting!

Attached is a sketch of my current setup. Everything is being plumbed through the wall for DWC system, controls & humidifier.

Here’s a photo of the room on the left awaiting installation of my parts. The flowering room is the exact same, but in reverse.

The sketch helped a lot, I was thinking you had all the mechanical in a non grow area not the veg room.