Which setup's better? (pics)

Ok so my light is getting here in a few days, and i'm having trouble settling on a ducting setup, so please take a look and tell me what you think!

I don't know wether to use 4" ducting or 6" ducting, I'm thinking 4" because my exhaust hole in ceiling is 4". Although, the light hood has 6" inline flanges as does the carbon filter (1 flange), I was just going to put reducers on them. Or would 6" ducting all around and then blow it out ceiling thru a reducer be better/quieter?





Closet is 9'x3.5'x7.5', and will be sealed w/mylar as i'm attempting stealth. These are the flowering side. Fan will be a converted stanley blower fan


p.s. oh and is there anyway i can make a zipper entrance on my mylar??? Thanks again guys!!

thanks!

The blower fan may not have enough negative static pressure, I have always found centrifugal fans are better for carbon filters...

But that being said, the second layout will filter the air more effectively. Having high static pressure behind the carbon filter is important and if your lighting fixture is not %100 air-tight, this will prevent the system from sucking up non-filtered air.

If the bends/curves in the ducting decrease your air flow and the bulb gets too hot, add an inline duct booster fan. They are cheap and highly effective and keeping the air moving.

Hope that helps.

It does thank you,

i visited International Cannagraphic Magazine Forums and they seem to rave over the stanley fan mod, plus it perfect for that first time growers budget, but i do plan to upgrade when possible. I think/hope it'll work for this small grow area in the meantime.

any other thoughts? ducting size?

so i'm leaning towards the second one although mounting everything is going to be a pita, i still can't decide wether to use 4" or 6" ducting..

the hood and the filter all have 6" flanges, now with a 4" setup i'd have to get 5 reducers, 2 for the hood, 2 for the fan and one for the scrubber. would that work, or just be ineffective and loud? The outlet is 4in so if it all was 6" would it be a big issue pushing all that out a 4" reducer? or would there be to much backpressure?



What would you do?

It is more efficient to pull air across the bulb. There would be no benefit to reducing between your fixtures, just use 6". As far as noise, either use a filter that is ok for 'blow through', install a store bought muffler, or any length of ducting after the fan will help.

just afraid that i'll lose to much static pressure drawing across the bulb then to filter, not sure how well the converted stanley blower will handle it. although i did come across this Valueline 6 Inch Centrifugal Inline Fan for cheap! i dunno, any more input i think i'll try this maybe;


if i can't get temps right i'll draw through the light and see if that does it, what kind of ducting is suggested?

construction monday

I would go with the first picture. Just make sure Your light is sealed off good.

I would also go with the inline fan with 6 in duct.

"p.s. oh and is there anyway i can make a zipper entrance on my mylar??"

I haven't used a tarp zip on anything but panda film.

http://shop.ebay.com/items/?_nkw=tarp+zip&_sacat=0&_fromfsb=&_trksid=m270.l1313&_odkw=6+inline+fan&_osacat=0

I don't know what would happen with the mylar. I'm sure it would work but it would crinkle up pretty good. Maybe it wouldn't be that bad though.


~PEACE~

arg! still torn between the designs.. quieter with it in the attic, more efficient in the closet..

I'd go with the first design because the inline fans are better at pulling air rather than pushing it.

Attics are hot! Unless You live in Oz than the summer is coming up soon.

I'd go in the basement but if that not an option than the closet. It might be rather hard to control the temps during the summer time.

~PEACE~

i shouldn't say attic, sorry, it's the level between floors that i'll be exhausting to, and the closet is in the basement

not an inline fan, although i might convert after first grow.. converted stanley blower

construction tommorow, any last comments?

thanks to everyone who helped(s)!! +rep!

Yeah... keep your exhaust separate...

if only that were possible right now, i do plan to keep the exhaust separate just can't do it yet, unless a 6in inline duct fan ($30ish) has enough power to keep the 600w cool enough? guessing it would be around 9ft of duct! even then i'd have to find somewhere to expel it as i only have one exhaust exit in my plans, and really can't tear up closet to make another, and i'm going for stealth..

the stanley fan and the looped system are a bandaid for the first grow, after that it will be redone! i'm a do it once, do it right kinda guy, but i just don't have the means..



without going beyond my means, does anyone else have anything to add?

.

bump, going to get the rest of the parts i need, thanks again all!

ok go with the 6 inch ducts for sure, use a inline or centrifugal to pull the air thru the filter and cooltube, then reduce to 4inches if you cannot resize your exhaust to 6 inches, it will help with efficiency to do such. most importantly keep your ducting straight and use elbows for corners and turns to maximize air flow, it will save your fan the struggle and keep noise down. Here is a link for a good quality zipper, worms way is the shit, next to htg supply. http://www.wormsway.com/detail.asp?sku=TZU800. I'd suggest using poly instead of mylar tho at leas for a door, tho i have seen it done. It'll be fine. good luck in your quest I believe things will go well for you. peace out ~the good doc

GypsyBush said:

Yeah... keep your exhaust separate...

Click to expand...

Great pics GypsyBush.

Thats how to set it up for maximum temp control.

"does anyone else have anything to add?"

I hope it works out for You. If You didn't have to worry about smell, like if Your venting it into Your attic, than You could add a 6-8" duct booster to Your ceiling and that would help keep temps down too. But You might not need to if You get a big enough cool tube fan.

~PEACE~

don't have the room around the closet for the fans n carbon filter to be like that, but that would be close to ideal

i think i'll try filter>light>exit>blower first, if that dosn't work well, filter>fan>light>exit

converted stanley blower

upgrades after first grow

Hi mate, interesting!
I would pull over the light not push, especially if you have a 4 inch bottleneck at the point of exit. If not, it is a lot more likely that you will get air leeks on the fans positive side that is caused by back pressure building up.

Gypsy Bush is right on