HL45.PPK.1.0 17lightsx2 Sealed with Co2

[bobblehead]

Your exchange is superior to mine because you are much closer to your total cf per room.

I am exchanging about half of the cf of one room.

What I am thinkin about is 1000cfm intake and 1000cfm exhaust only equals 1000 cfm...

Whereas 1000cfm+1000cfm intake with a big passive exhaust might get closer to 2000cfm of exchange per a room.

Perhaps I have it all backwards tho, I am slipdexic.

Lol... I'm gonna beat this into your head, but in a friendly way... . You're still pushing 2000cfm. You're bringing in cool air from the room with the lights off, while at the same time sucking hot air out and dumping it in the other room to be reconditioned before being pumped back into the room with lights on. That sounds like a lung room to me. The only problem would be if you had mold or some sort of pest... But filters on the fan, higher heat and the high CO2 levels should help with those...

Think about it like this... A passive intake or exhaust is a bottleneck, and you can only remove as much air as is coming in for total exchange... Otherwise you get negative/positive pressure. If you have positive pressure, you're going to push the stink out any cracks, not just the passive intake/exhaust. I'm not telling you that you shouldn't increase your air exchange between rooms, but keep it how you have it already, with one fan pushing and one pulling. My air exchange is superior, but i'm not using CO2. I dump my air into the garage and pull fresh air through the crawl space, and pump it through a HEPA furnace filter to catch mold spores.

 

[ImaginaryFriend]

I have been reading up on raw salts and it seems that lots of Jacks heads end up going down this route.

Looks like fun, then I think to myself, right now at this moment, I need to nail it with jacks and get my flip running smoothly.

I agree. Jacks is better than good, and better than most. If it is your weakest link, you have definitely pushed the growers edge.

 

[high life 45]

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[high life 45]

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[high life 45]

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[high life 45]

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[delta9nxs]

hey, your plants look great! nice strains! i would love to try them some day.

on the venting issue, am i not getting something?

if you have two or more fans and want max flow you put them all on exhaust with appropriately sized passive intakes.

2 x 1000 is 2000.

if you put 2 fans inline even though they are supposed to be identical one will move a little less air than the other and the slower one will act as a baffle.

my old room was 1200 cu ft and i moved 2750 cfm through it, if you can believe fan ratings.

i've used jack's as a foliar before at around 400 ppm at .5. it doesn't hurt anything but the growth is so fast anyway that i didn't see any difference.

thanks again for all the electrical stuff! seeing yours has helped me a lot.

later

 

[high life 45]

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[delta9nxs]

Yeah about my cfm..
1000cfm intake + 1000cfm exhaust = 2000cfm?

well since everyone says so.

I still feel like I am only moving 50% of my 1920cf room

no, 1000 intake plus 1000 cfm exhaust do not equal 2000 cfm

2 1000 cfm exhaust equal 2000 cfm with adequate intakes

 

[bobblehead]

no, 1000 intake plus 1000 cfm exhaust do not equal 2000 cfm

2 1000 cfm exhaust equal 2000 cfm with adequate intakes

Then why does my room get cooler with a powered intake than with passive intake alone? My rooms have all sorts of cracks and big access holes for passive intake... When i start pumping in the conditioned air and eliminate my negative pressure, or at least greatly reduce it (i have negative pressure in my lung room, along with a smaller powered intake), the temperatures are more stable.

We're talking about displacement. If you pump air into a room, it displaces the air that is already there. At the same time you're sucking air out, and displacing that amount of air. Now my head is starting to spin... B/c i'm seeing the other side's argument... But i'm sure i'm right? Lol...

 

[catman]

Then why does my room get cooler with a powered intake than with passive intake alone? My rooms have all sorts of cracks and big access holes for passive intake... When i start pumping in the conditioned air and eliminate my negative pressure, or at least greatly reduce it (i have negative pressure in my lung room, along with a smaller powered intake), the temperatures are more stable.

1000CFM in + 1000CFM out = 1000CFM going out, theoretically. In reality the load on the fans is not identical so actually the fans work against each other while generating more heat and reducing life of the fans.

Two 1000CFM exhausts (or intakes) = 2000CFM. Ya guys are just getting confused because they are in different spots in the rooms. Just imagine the two fans side by side; together they will push or pull twice the air. So of course If a room is about 2000 cubic feet and you have two 1000CFMs working together, you are exchanging once per minute.

Now unless I'm misunderstanding something, your trying to do 2x exchange because of Fred's advice. Fred is talking about bringing in air from the outside and exchanging it 2 times per minute BECAUSE this provides enough CO2 without any supplementation. General exchanges of gas is also good for managing moisture in the air and the threats that like the moisture. Ya can't exchange inside and outside air in a sealed room so I don't think 2x is the rule of thumb you are shooting for (depending on your CO2 levels I guess.)

I've been doing some research on commercial greenhouses to gain insight and apparently it's best to run a garden like a sealed room with exchanges between day and night periods. So, lights on-room is sealed. One hour before lights off, room gases are exchanged with outside..and then again one hour before the lights back on.

If you hybridized your ventilation system on a schedule like that you'd essentially be making a lung room out of your dark room. I never thought about spinning the air between two rooms before, but it seems like a good idea to me. You are spreading the heat around more evenly which keeps day and night temps closer for shorter internode spacing. You are also moving the moisture that is dropped from the air as it cools from the dark room to where the moisture can be used. Lastly, the dark room simply gives ya more air (with CO2) for the day room so you can get away with running lower CO2 levels as long as your moving the air around. I suppose the 2x rule of thumb would actually apply if you kept the CO2 levels at normal outdoor levels...that would basically be what Fred says. The only down side I can think of from spinning the air around is you could get some wind burn on plants near the fans so maybe 2x isn't what you wana shoot for. Anyway, the more air ya can move around, the lower optimal CO2 levels are gunna be.

Think I covered what you've experienced bobble, but I could be wrong. Seems you got it figured out, but are just tripping up on putting it into words. Spinning the air around more doesn't make things any cooler, but it does make things more stable because of more uniform distribution.

 

[bobblehead]

ok actual cubic footage of my grow space, not the entire room, is Pi3^2 x 8 which comes to 226 cft. So 1 435cfm fan does almost exchange the air 2x... Air acts like a liquid, so I understand what's being said about w/e the exhaust is, is the cfm's being pumped out... I think that the exhaust would run more efficiently though with air being pumped in than with back pressure. You would need a lot of passive intake to relieve that back pressure... Kinda like a 500gph pump with a bunch of 1/2" tubing connected still needs 3/4" return lines to keep the pump supplied with water...

 

[high life 45]

Bobble its ok, my heads a lil sore but I still love you

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[delta9nxs]

nice post, catman!

even with co2 the air exchange is necessary only if you are not running a completely sealed room.

in the greenhouse and animal production industries they all run active exhaust with passive intakes.

 

[delta9nxs]

Then why does my room get cooler with a powered intake than with passive intake alone? My rooms have all sorts of cracks and big access holes for passive intake... When i start pumping in the conditioned air and eliminate my negative pressure, or at least greatly reduce it (i have negative pressure in my lung room, along with a smaller powered intake), the temperatures are more stable.

We're talking about displacement. If you pump air into a room, it displaces the air that is already there. At the same time you're sucking air out, and displacing that amount of air. Now my head is starting to spin... B/c i'm seeing the other side's argument... But i'm sure i'm right? Lol...

hi, there can be no doubt that you are getting a higher flow rate with both fans than with just one fan on exhaust but you would get an even higher flow rate if you put them both on exhaust, operated separately, not tandem.

you will also get a higher flow rate by putting tuned length ducts on the inside and outside of the fans. the proper tuning is one fan diameter in duct length on intake and two fan diameters in duct length on exhaust.

so if you have a six inch fan you would run a 6 in piece of ducting on the intake side of the fan and one foot piece of ducting on the exhaust side of the same fan. smooth ducting, no accordion pleats or convolutions.

this is really funny. i might be wrong but i don't think so, too!

 

[disciple]

 

[silver hawaiian]

The platinum OG is top notch. So frosty! Probably my favorite herb at the moment, perfect high for me. I did a cleanse a couple years ago and didnt smoke. Ever since then I get anxiety from alot of strains. Never had it before, I was smoking 1/4-1/2 oz at some points. I dont really smoke that much anymore. A one hitter quitter nowadays, I miss being able to puff tough sometimes. I love the plant so much. It just amazing. Thinking about getting a vaporizer.

hl45 - I'm way late to the party, per always, but I can't wait to see that the next 7 pages bring! Looks like it's going to be tits!

I'm with you on the anxiety thing - and I have to say, vaporizing is a night/day difference for me (durr). But really, far less anxiety-inducing, regardless of the variety I'm finding.. (Sure, some more than others, but none BAD)

I've got an Arizer Extreme Q, which was cool as a novelty, but was too cumbersome for me to really ever get into.

Fast forward a year, I picked up an Arizer Solo - I now vaporize probably 70% of my tweed.

I also find that more kush-dom varieties are a little more gentle on my nerves too.. YMMV

Can't wait to watch the rest of the show!

 

[silver hawaiian]

Caught up, at long last! Shit, now I gotta run - gonna be late. Sorry gentleman-I've-left-waiting!

 

[Ichabod Crane]

If I am understanding this right you are drawing air from one room and then replacing that air with air from the room you are blowing into. If you are just circulating the air between two rooms then you will have to cut two holes from one room to the other. If this is the case then why don't you just reverse one fan so both are blowing out then put it back so one is blowing out and one blowing in. You should then be able then to tell which way works best in your case. If I am understanding what you are saying this is what I would do.

 

[high life 45]

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