Air intake question/help

I'm working with a shed only with a 1 somewhat passivE in/outtake; the door.
What I need help with & advice is this: if I leave the door open 1/4th to 1/2 of the way open for about 1-3 hours per 24 hrs would this be adaquite for a decent air exchange for the room? At the time I only have 1 oscillating fan blowing on and aroound the crop. So their is no fan pulling or pushing air directly near the door.
Dimensions for the shed is around: 12w x 14L x 14h

Any hlp would be awesome or better yet Anyone with personal experience, thanks everyone!

Nope no good at all. You will need extraction, a shed can build up alot of heat real quick. You didn't mention lighting, are you using HID, LED, CFL or what?

The oscillating fan does nothing for venting the area, all it does is move the air about inside and not replace the old air.

Really you need extraction running all the time during lights on as a minimum, however I keep mines (indoor) running 24/7 so there is always new fresh air available.

Yea I'm running a 1000w mh. My temps stay okay at bout 68-80. Also even though their is no fan pulling in fresh air air still does come through and all the hot "spent" air has to go somewhere when iit is replaced right? Even if it is comming in with no help. Am I right anyone? Correct me if I'm wrong.

Am I missing something?

Is this shed indoors or out doors?

I’m assuming indoors, either way I'm not sure that an average of one and a half hours of fresh air per day would be sufficient to give your anywhere near optimal growth.

As suggested an exhaust fan would almost certainly ensure that you have fresh air coming in.

You could put it on a timer.

[FONT=&quot]Also have an osculating fan for moving the plant tops and air around.

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Herb Man said:

Am I missing something?

Is this shed indoors or out doors?

I’m assuming indoors, either way I'm not sure that an average of one and a half hours of fresh air per day would be sufficient to give your anywhere near optimal growth.

As suggested an exhaust fan would almost certainly ensure that you have fresh air coming in.

You could put it on a timer.

[FONT=&amp]Also have an osculating fan for moving the plant tops and air around.

[/FONT]

Click to expand...

Its actually an outdoor shed disconnected from any other building. It's wooden, with shingles and such and am currently in the process of insulating with if ffiberglass insulation. Having any more fans at this point becides the one oscillating on and around my crop (whitch is only 1 week old). I plan on adding another fan in a few weeks to put in front of the door when open, or if I can adding an exhaust vent with an inline fan to a sealed window.

But as for now do you think what I'm doing now for the next month would be okay for my plants? I've heard of growers having no fresh air comming in (or very little only from opening a door) and their grow doing well.

Little plants (1 week old) will be fine and probably will be for a few weeks, that being said you should work on trying to get a fan to exhaust the heat and stale air, if the shed is tight you may have to make a couple of vent holes to allow fresh air in, if you can light coming through you should be alright.

cannabis culture said:

I'm working with a shed only with a 1 somewhat passivE in/outtake; the door.
What I need help with & advice is this: if I leave the door open 1/4th to 1/2 of the way open for about 1-3 hours per 24 hrs would this be adaquite for a decent air exchange for the room? At the time I only have 1 oscillating fan blowing on and aroound the crop. So their is no fan pulling or pushing air directly near the door.
Dimensions for the shed is around: 12w x 14L x 14h

Any hlp would be awesome or better yet Anyone with personal experience, thanks everyone!

Click to expand...

ok here is the math break down
12x14x14 = 2532 CF in your grow area
now u take 2532 and devide it by 3 that is 784

u need a fan atleast 784 CFM this will replace the air in the shed once every 3 mins (yes this is important this will keep the plants cool along with provide fresh Co2 and O ) now this is not done that is just the basic math

u are using a 1000w light is it cool tube/air cooled hood...........or is it open light with a reflector

do u want/have a carbon scrubber

well there is enough detailed answers here but i have the feeling that the answers are not good enough for you. you are looking for the answer that is wrong. you NEED extraction, you have a 1000w light. even seedlings will die in a day under that stressful light.

YOU "NEED" EXTRACTION THAT IS A MINIMUM OF WHAT JUSTUGH SAID

if you use fluorescent bulbs for the first few weeks, you MAY just get off without the extraction till you turn on that big bulb but if you do not get extraction you WILL fry your plants

i been working on this in my head ...........i was looking at this idea for myself during spring summer and fall

http://www.amazon.com/Active-Air-Inline-Fan-12/dp/B003IM058Y
that is a 12 inch fan with a rating of 969 ...............i picked this brand becuase they are the lowest sound lvls on the market (not much but every bit counts)

this is the exhust system .............u mount this inside on one of the beams .........u need 12 inch flexie ducting and u need clamps ...........on the wall u need to make a hole and use this to vent the air out (no rain/bug/ppl peeking in)

if u can give us some pics of the shed and the area around it I will try to help tell u the best placement...............u will need to have a 12 in hole or something on the other side (if the fan is sucking at the back left of the building u want the venting in to be at the upper right ) this gets u the best cool and air replacement in the inside

(just to help u the intake hole can be up high with a screened vent to keep birds and bugs out then u use some of the extra ducting to connect to that and then make it vent at the floor with a powered system )

I'll get some pics up of the shed later today when my lights turn on. And yea I know I NEED proper air extraction and all that, I'm just trying to get by with what I have at the moment.

As far as venting goes I do have 2 good sites for ducting with inline fans to go, I just got to wait a few few before I can actually get them ($'s tight right now $.
bu
ythanks for all the advice, an ill get some detailed pics in later today for your review, and thx again!

here is how to off set the cost

u have buddies ..........those buddies will want u to part with some of your extra stuff (that room size u are not fooling anyone on motives) ...........tell the buddies that u have gotten a place and u are doing what u are doing and if they kick u 200 bucks it locks them in at 300 per oz price (1200 qp) they are not bitching and u get the money to start up the extra cash flow

auto plants are the best with the 75 day turn around from seed to jar to sell off (it also removes several varibles in the grow if it is your first time ) just the higher yeild ons make sure u have the feed ready becuase they will soak it up and when they say 60 90 days they mean that u can not extend the period they will yellow up rippen up and be begging for cutting

Good idea, should have thought of that,lol. Imma see what I can do. Also some autos will be a good idea too.

Also this is not my first crop, it's my second indoors (first one growing in my friends tent, that HAD proper venting setup)and I been growing outdoors for years.

You can skimp on the intake but outtake is a must. If you have a 10' x 10' x 8' Shed that is 800 Cubic feet. You need atleast a 160 CFM fan taking the air out. This is absolute minimum.

here are the picvs of the shed i n question. I have since been opening the top window as well whenever i open the door; top woindow acting as passive outtake and door as passive intake, well thats the idea anyway, i figure the aior moves alot better that way atleast until i can get a venting system going on. any inoput would be awesome/

also sorry for the sideays pics, my pc is trippin and uiploadfing them like that and im in too muich of a hurry to fix them, so please bear with me! thanks guys.

View attachment 2829675View attachment 2829676

these were taken 1 week from seed. from what you can see (tilt your head sideways..lol) how do the little ones look at 1 week? maybe shorter from when they actually cracked from the seed