toquer said:

i tried this without much success at my old building. some things i learned in the process...

i had a 5 ton ac in my lung room open on the bottom and ducted out the top, it went into each room with 10" hard ducting and had 1 drop per 100 sqft. There were a total of three room, one of them 500sqft the other two were 300sqft and 200sqft. I had 20 lights flipping from one room into the other 2 smaller rooms of 12 and 8 lights respectively. Inside the lung room were a few propane burners to maximize co2 for the room needing the ac the most. that in theory would have been the room with the lights on. 5 tons should have been enough for 500sqft with 20 lights all ducted but it wasn't. so we enlarged the ducting to 16" and instead of allowing the lung room to breath freely through the walls we then ducted that as well directly to the lung room and put in motorized dampeners on the entire operation and zoned it into 3 rooms. still didn't work. moved the co2 burners into the individual rooms and still had problems. our lung room could not breath enough to handle the volume of 8000cuft. i had low ceilings at the place to start. finally we closed off the lung room and moved the ac above the rooms ducted directly to the return of the ac again using more dampeners. this worked to a degree. but that's not the point... what i learned...

i believe the lung room has to have a tremendous amount of negative pressure
at nights plants need the ac just as much as they do during the day as when the lights turn off it takes a few hours for the entire room to cool down
the ac acts as a dehu all night long as well
the lung room should be as small as physically possible as it is adding volume of air to maintain
i'd say get a second dehu as it's the first 2 or 3 hours of darkness where humidity spikes,

if you're building a lung room purely for the sake of saving on propane burner and dehumidifier i'd scrap the lung room idea and get the additional components to make each room ideal and just use the flip for the sake of lighting. perhaps for moving the air through the lights you could devise a flip system or plenum so that you maximize airflow through the lights and not duct 4 of them in a row. from my experience 2 lights in a row max otherwise you're just blowing hot air on a hot light bulb.

just a few thoughts from my experience

Click to expand...

toquer said:

i tried this without much success at my old building. some things i learned in the process...

i had a 5 ton ac in my lung room open on the bottom and ducted out the top, it went into each room with 10" hard ducting and had 1 drop per 100 sqft. There were a total of three room, one of them 500sqft the other two were 300sqft and 200sqft. I had 20 lights flipping from one room into the other 2 smaller rooms of 12 and 8 lights respectively. Inside the lung room were a few propane burners to maximize co2 for the room needing the ac the most. that in theory would have been the room with the lights on. 5 tons should have been enough for 500sqft with 20 lights all ducted but it wasn't. so we enlarged the ducting to 16" and instead of allowing the lung room to breath freely through the walls we then ducted that as well directly to the lung room and put in motorized dampeners on the entire operation and zoned it into 3 rooms. still didn't work. moved the co2 burners into the individual rooms and still had problems. our lung room could not breath enough to handle the volume of 8000cuft. i had low ceilings at the place to start. finally we closed off the lung room and moved the ac above the rooms ducted directly to the return of the ac again using more dampeners. this worked to a degree. but that's not the point... what i learned...

i believe the lung room has to have a tremendous amount of negative pressure
at nights plants need the ac just as much as they do during the day as when the lights turn off it takes a few hours for the entire room to cool down
the ac acts as a dehu all night long as well
the lung room should be as small as physically possible as it is adding volume of air to maintain
i'd say get a second dehu as it's the first 2 or 3 hours of darkness where humidity spikes,

if you're building a lung room purely for the sake of saving on propane burner and dehumidifier i'd scrap the lung room idea and get the additional components to make each room ideal and just use the flip for the sake of lighting. perhaps for moving the air through the lights you could devise a flip system or plenum so that you maximize airflow through the lights and not duct 4 of them in a row. from my experience 2 lights in a row max otherwise you're just blowing hot air on a hot light bulb.

just a few thoughts from my experience

Click to expand...

500lbs Guerilla said:

I'm potentially moving to a new home with a four car garage that measures roughly 23'x33' (minus a 7'x3' bathroom in one corner). I would like to build two sealed 8k rooms, probably 12'x20' each, on a flipbox. I'd like to purchase as little new equipment as possible, as the move and build will stretch me a little thin. I have about 150 amps to use at my disposal.

Here are some items I have laying around which I assume will come in handy.

(2) 24k btu dual zone mini splits
(2) 12" Max fans
(2) 8" Max fans
(1) Phoenix Max 200 Dehumidifier
(1) 8 Burner C02 Generator.

I've heard of lung rooms, but have never used or seen one. I assume I have plenty of space for one, but aren't sure how big they need to be, or how small of one I can get away with. I'd like to save some garage space if possible, at the very least for a few racks of T5's for vegging.

Although I think my dehumidifier can handle both rooms, I'm also not sure how to set it up to do so. Should it be on a separate timer to only run in the rooms whose lights are off? Or should I plan on purchasing a second dehumidifier so I can have one running 24/7 in each room.

Any input would be appreciated.

Click to expand...