What kind of fan do i need.(plz help a n00b)

I am designing a grow cab.

I have worked out the volume to be 70 cubic feet.

i am using 400W HPS aircooled hood.

airflow as follows.
(room-->dryingbox-->veg-->flower-->filter-->reflector-->exaust)

What type of fan/filter system would you experts recommend?

a big one!!

or maybe two!! u have a long route the air is traveling!!

lame, any real advice?

when i said a big one i meant one with high cf/m ratio i assumed u have read grow faq before posting a question!! and u can go to grow faq and they have it all there i wont sit and calculate what fan YOU need thats YOUR work!! but i can tell u u need either a high cf/m fan or two smaller cf/m fans as the route the air is traveling in is quite long!! and your attitude will not get u far!! try being more polite!!

go with like a 6" vortex can fan with a 6 " inlet carbon scrubber... you can get a great deal on a combo here... www.htgsupply.com it's right on there front page... that would work perfect for your area.... it's 199.00 for the combo... comes with everything

yo so the HTGsupply is reccomended then?

w0rd im on it.

got 2 loveit - seriously get a life. you really think i havent read all the material available. Forums exist so i can get a personal account. Not so somebody can tell me to go read an FAQ. I have read everything. I know about how much cfm i need, just wondering which products are recomended. thats all.

like should i shell the extra cash for the canfan33 combo or go for the 200 bux HTG one.

got2loveit - you make assumptions that you should not make. and i suggest that you actually provide real responses to peoples questions, who knows life might hit you back with some unexpected help sometime.

oh yeah the air will be contained for a total travel of about 6 feet. LOL @ 2 fans maybe u need to read up.

Your only going 6 feet in total? That is not far at all. Get a CFM of at least 250-300 blowing into the dry box(why even have the dry box attached to the venting?) along with another 250-300 fan at the exhaust. You will be pushing (ineficient) and pulling( very efficient!) causing a perfect flow of air.
One concern I would have is that if your drying weed got mold on it, you would now be bringing the mold into your grow room/box... If you can, just seperate the grow box from the rest of the system.
And I would chill a bit, the guy was trying to help you out, he just didn't have all the info. And yeah, you will need to fans with a setup like that.....

ya, I actually live by htg supply .. the owner and staff are amazing there... very very highly recommend... inside the shop they have about 12 different gardens and lights on display growing a variety of veggies, and plants... very cool place... haha and I could swear the owner grows mj.. lol

i really have no intention of going on with your stupid beef!! u asked what kind of fan you needed and stated some facts! this obviously creates the understanding that you are not looking for a brand but rather the cf/m that your fan should have otherwise you wouldnt give all the facts!! i just tried to help by telling you you need a big fan meaning high cf/m ratio or two smaller ones!! if you wanted to choose a brand then you should have said which fan is best more silent more efficient more value for money not what fan do i need!! and yes as mannurse tried to tell you i was only trying to help you!! replying lame and give me some real answers isnt very polite!! if you had mentioned you were looking for brands i wouldnt answer in that way!! and i think that you do need be more polite as you could have simply said im looking for a good brand and not answer as a stupid 11 year old kid telling me to get a life when all i tried to do was help!! and you get many replies in your life that you dont like but it simply shows ignorance responding in the way you do because u dont agree or dont like what your being told!! the right way to go is thank and and just ask the next guy for more info!! i hope this clears up your mind and you understand!! and telling me to get a life is simply sad on your part boy kick fear and hatred away from your life and embrace love understanding compassion and forgiveness and youl be on a much better road guaranteed!!

i was thinking about some shitty axial fans to help intake into the veg room, i will be devising an extremely high airflow light proof barier between rooms. much more so than ducting(if i find a way) .this intake will be inside the dry box. with the fan on 24/7 (around 400 CFM) i don't think that there will be any mold growing. buy yes ideally i will dry at a buddies place and give a take of the grow.

i am not gonna buy 2 centrifugal fans.
that would be too expensive for me.

2 fans would not be easy either cus it might be harder to create the negative pressure i need to keep smell contained. anyways here is a small diagram of what i was thinking.



i really dont see the need fr 2 fans here.

and in the pic there would be a light too, and a fan, lol fergot to draw them

got2loveit said:

i really have no intention of going on with your stupid beef!! u asked what kind of fan you needed and stated some facts! this obviously creates the understanding that you are not looking for a brand but rather the cf/m that your fan should have otherwise you wouldnt give all the facts!! i just tried to help by telling you you need a big fan meaning high cf/m ratio or two smaller ones!! if you wanted to choose a brand then you should have said which fan is best more silent more efficient more value for money not what fan do i need!! and yes as mannurse tried to tell you i was only trying to help you!! replying lame and give me some real answers isnt very polite!! if you had mentioned you were looking for brands i wouldnt answer in that way!! and i think that you do need be more polite as you could have simply said im looking for a good brand and not answer as a stupid 11 year old kid telling me to get a life when all i tried to do was help!! and you get many replies in your life that you dont like but it simply shows ignorance responding in the way you do because u dont agree or dont like what your being told!! the right way to go is thank and and just ask the next guy for more info!! i hope this clears up your mind and you understand!! and telling me to get a life is simply sad on your part boy kick fear and hatred away from your life and embrace love understanding compassion and forgiveness and youl be on a much better road guaranteed!!

Click to expand...

you say you dont want beef, yet you dont contribute anything.

please now that you know the info i seek enlighten me.

or keep it to yourself, but please no more useless posting in my thread.

yo pong, please don't lash back at me man. I get where got2luvit is coming from! The way you posted made it sound like you hadn't done any research, and wanted others to calculate for you. You asked what you should get, not what brand @ ###CFM. I think he also thought you were being rude when you weren't, and you both had a misunderstanding. I feel/hope that he was only trying to help you out in the future for getting help from us here at RIU! SPREAD THE LOVE MAN!
Also, I COMPLETELY agree with mannurse, as I'm sure FDD2BLK and others would too. I would NOT use the same fan flowing through the dry box then to your rooms. The possibility of spreading mold..how terrifying!!! If anything, I'd put the dry box at the END of the exhaust. I wouldn't even do that though because the air would be hot n humid probably, n' you want nice, dry, n cool!
As for fan recommendation, definitely S&P TD mixvent series. I would go with the TD-150. I have the 100 and 200. The 100 wouldn't be enough, and the 200 would be absolute OVERKILL for a small cab.
HOWEVER if you got the 200, or 200x, you could get away with running a Y-duct to blow through your dry box!
Sorry for the LONG POST. These are just my thoughts and opinions, feel free to get them elsewhere too man! Good luck with your grow, and stay safe!
PEACE.

Go to surpluscenter.com. There you'll find a good selection of fans and blowers in various sizes and prices. airreactor.com also has good combinations of fans and filters a 115cfm carbon filter was around$41 complete.

Based on that diagram, a good 400 CFM fan would work yeah, but is overkill for sure, it would be hard to control your temp humidity.... along with perhaps a passive intake vent at the grow box area. You are not just running duct work the whol way I hope... just gonna have passive vents the whole way in between the rooms right? I am sure you are but just making sure you are not putting ducts the whole way through....
With a setup like that, the bax obviously would have to be air tight completely. Any leak and you would lose a substantioal amount of suction/negative pressure.
Also remember, drawing air from the dry box, you will be draing in maoist air until the buds are dry, you may increase your humidity a little too much, and your veg room need higher humidity than your flower room... just letting you know the challenges you may have with connecting everything like this....
It actually looks pretty slick, as long as you get the CFM rating,m huimidity and heat right....
So are you just looking at a constant flow of small plant? Looks pretty cool. You should set up a grow journal for it, let us know how it works... Cheers.

Also, is 70 cubic feet the total for the flower, veg, and dry box? And what size light are you using in veg? Also a 400w? Sorry I forgot to ask earlier.

even though in my opinion you dont deserve it i will try and give some info!! as i see in your design there will be two holes in the dryer box one on each side one for intaking from the room the other to provide a route for air going into the flower chamber in which you will have the fan pulling through the carbon filter through the cool tube and out at the back!! from the height u show ur holes in the dryer and veg chamber i think ul have one prob the air will not move uniformly in those areas as the air will pass from one hole to the other without actually providing air exchange in each chamber itself(just as the red line goes)!! this will also cause a temp increase as the air under your light in vegging(hot air) will stay trapped in the upper sections of this chamber!! remember cool air is down hot air is up!! so one thing you could do is have double the holes so you will actually have two passive intakes!! you can go two ways about this the one being just making a whole at the bottom of your flowering room for intake but also making the hole to your drier box and veg room on the bottom of your cab and then the exhaust of the veg on the top part of your cab but u will have a prob with air in your dryer box as it will not move around!! all in all i think you need to remove it from your design!! this way u will have cool air coming in from the bottom part of your veg escaping from the top part thus ensuring fresh air comes in and hot air goes out!! and then in your flowering room ul need an intake at the bottom part for fresh air coming in and hot air leaving from top!! the fact that u will only use passive intakes for your fresh air will give u all the neg pressure u need!! second way to go or other solution would be to make two passive intakes both going through dryer and veg to flower but the holes will be on bottom part and on upper part by this u ensure easy intake of cool and fresh air through out all chambers and u will have air mixing in each chamber as it will flow easier!!! so by this way ul have two red lines in your drawing running parallel one on the bottom and one on the top!! so is this useless??

yeah im gonna use a 400W hps in the flower
and CFL in the VEG.
I will be putting 6 well established clones in the flower every 2 months(about the seed pack says 45-55 days.)

i am going to build a frame (in woodshop) and completely seal it up. i am just gonna have to figure a way to seal the doors.

this is a slow project. i have been making plans for a long time and probably wont finish for a while.

also for the clones and the humidity they need. i will be using a plastic dome for them cus the airflow is a little rediculous through that veg room.

when i build the box though i will make it modular so i can separate the two if i can.

the main reason i am trying to filter the veg room air too is cus i have heard of even plants in veg reeking.

i like this project because it brings together so many elements. building/thinking/designing/gettinghigh/etc.

a documentation will go up of the box and the first harvest for sure.

also planning on making this a hempy grow!!!!! seems ez enough.

My room is 420 cf..It just worked out that way..Some subconscious at work. My 2 fan/filters replace all the air in about 2.5 min. I have them draw the air for efficiency, My intake is opposite the fans and at floor level fans at ceiling. The temps stay around 85 floor to ceiling..I also have a fan pointing down from ceiling to maintain equality in temps. RH is kept at 50% as that's the ambient RH of the house. To lower it any more would mean I should invest in the utility Co.!!*g*
Keeping dry/grow separate is best as you don't want the same airflow in drying as you'll need in growing because in growing you need to replenish CO2...Which is a whole 'nother ball of wax.....zzzzzzzzzzzzzz