Ventilation..and all the questions behind it!!

So I plan on making my purchase from greencoasthydroponics.com in a couple days.

My shopping list is...

-Inline Duct fans, 6" intake, 8" exhaust.

-An 8" (Y) clamp converting to (2) 6" fittings. forming a Y...

-Thermal airduct hose to transfer heat from light to 8" exhaust.

-Oracle Dual Digital timer 120v.

-Lumatek Ballast w/ Yield master 600w HPS EYE Hortilux Bulb.

-YoYo Reflector.

My BIG question is...I realized the yield master doesnt have a built in fan. just a fitting for it. SO...if i purchase clamps and clamp the thermal 6" hose to the Reflector fitting, to the 8" "Y" fitting, will it cool the room enough? obviously id only be using (1) of the legs of the "Y" clamp so the other one would freely suck out air from the room.

will this active intake, (weird) active exhaust method work?

any experts with help?

sorry if this thread is a little confusing tried to lay out exactly what i plan on doing


Thanks all

Cannifornia

if I understand you, you are going to split an 8" line to 2x6" and use one 6" for an air cooled hood, and leave the other just open to pull ambient air from the room? If that is the case the issue you will have is that the air will take the path of least resistance, which is going to mean primarily pulling air through the unused 6" opening, and only pulling what back pressure that extra 2" diameter provides through your light. Fix that and it would be just fine. Alternatively you could get 2 4" fans, or a 4" and 6", which is better imo if you can afford it and have space.

its a "Y" fitting..the "bottom" part of the Y if you will, being 8inches. and the "top" of the Y, splitting into (2) seperate 6in fittings. both are 6 inch

yeah, you could do it, but you would need to fine tune the open intake so it forced enough flow through your hood.

Think of it this way. If you take a straw, and blow through it, you get a decent stream on the other end. cut out half of the side of the straw, and blow through it. At the end you will get some airflow, but it will be significantly less with the hole in the center. So you would need to blow the open intake enough to force roughly 5-6" worth of air through your hood, and whatever was left through the open intake. It's not ideal, as I said, separate fans is ideal, but it's doable.

i would not get those duct fans. You will be disappointed in their performance, even the slightest amount of resistence (from trying to suck air from the box) will cause it to operate at much lower cfms than advertised. i wish someone had warned me about duct fans before i wasted 100 trying to go with them for my grow thinking they would do alright and be good enough. look into can fans or squirell cage fans.

darkdestruction420 said:

i would not get those duct fans. You will be disappointed in their performance, even the slightest amount of resistence (from trying to suck air from the box) will cause it to operate at much lower cfms than advertised. i wish someone had warned me about duct fans before i wasted 100 trying to go with them for my grow thinking they would do alright and be good enough. look into can fans or squirell cage fans.

Click to expand...

You sure you don't mean booster fans? Duct fans is not really a finite term and though technically it is more appropriate for centrifugal fans, it is often used to refer to the cheap booster fans you find at home depot. To give you an idea, a 6-8" booster fan is usually around $25-30. A 6-8" centrifugal fan is going to run you $80-$200. They are a little cheaper than can fans in general, and more properly fit for ductwork than a blower (a squirell cage fan). Anyway, long story short don't get suckered into a booster fan, they are meant to work in conjunction with a real centrifugal fan to increase the pressure in long lengths of ductwork.

Here is a good diagram so you can get a general understanding of the basics and start to think about the variables in your specific situation.

i was planning on buying

http://www.gchydro.com/detail.asp?product_id=xinline


should i try and purchase...

http://www.gchydro.com/detail.asp?product_id=XVORTEX


instead?

and another question...

the Vortex 4" inline fan moves 175cfm.

and the 6" moves 450 cfm.

the 6" is 40 dollars more.

Do i neeed the 6" or is the 4" suitable? my room is about 20sq ft

Obv the higher CFM the better, just match hood, filter and ducting and buy one of these if you want to turn it down.

yeah, that first thing you linked is a booster fan, you don't want it. The second one, the vortex, is a centrifugal fan (and vortex is one of the top brands). Doesn't have to be that brand, but that style is what you want. I would go with the 6", there are more budget brands where you could get 8" for the same or less. When it comes down to it the more the better, and in the rare case where you can give it too much, you can always get a thermostat control (~$50), or something like the above posters controller (which I have seen for around $20).

thanks for the advice. I checked out centrifugal fans online and they all seem pretty well. Alotta people said pay the extra money for the top of the line Vortex though(because of the 10 year wrty).

If i buy the 6" Vortex and have 1 exhaust and 1 intake it will move air in and out of the entire room about 3 times per min. Which i think would be pretty damn good.


SO if I put a "Y" clamp on the exhaust fan, so it breaks off to (2) separate 6" fittings, do you think i could hook a thermal airduct hose from the Yield master 6" AC fitting to one of the Y clamps, and have the other 6" fitting sucking out the other air?

just not too sure if this idea of mine will be effective enough for the exhaust

any ideas?

I know people don't read but I even posted picture. Sheez

that picture is the same layout i plan on doing. but whats the filter? carbon filter?

Cannifornia said:

that picture is the same layout i plan on doing. but whats the filter? carbon filter?

Click to expand...

Yes, it is

i was going to purchase that a month into the grow because im already gonna blow like 900 bucks on everything and id have to wait an extra 2 weeks for another paycheck.

how exactly do the filters work?

do you just stick it in the room?

or do you mount it on the opposite side of exhaust fan or what?

thats the main thing i dont know much info on

Cannifornia said:

i was going to purchase that a month into the grow because im already gonna blow like 900 bucks on everything and id have to wait an extra 2 weeks for another paycheck.

how exactly do the filters work?

do you just stick it in the room?

or do you mount it on the opposite side of exhaust fan or what?

thats the main thing i dont know much info on

Click to expand...

Look at the picture above, you place it on the opposite side of the fan so the fan sucks air through, and yes they work why else would people buy them?

You wont need one until you flower though, so you might be fine with out one for a while.

With a room setup of the picture above. Would it seem feasible to cool a 1000w hps (aircooled hood) and ventilate a 5x6x7h room with one 6" in-line fan? Would probably go no filter...

akdelta said:

With a room setup of the picture above. Would it seem feasible to cool a 1000w HPS (air cooled hood) and ventilate a 5x6x7h room with one 6" in-line fan? Would probably go no filter...

Click to expand...

Archimedes was know to say, "Give me a place to stand and I will move the earth".

It's all about the math. Solve the equation where E = 85*(Ambient temp of grow room), A = ? (Ambient Temp at passive intake, THIS IS THE MOST IMPORTANT VALUE), D = ? (Drag on fan of Carbon Filter), C = ? (Watts HPS), B = ? (CFM of fan)

So im gonna purchase the ValueLine fans because i guess they a bit quieter than competitors. which works for me.

and im also going to purchase the speedster fan controller too.

im going to buy a cheap 50$ duct fan for my light hood.

my question is, can i use the fan as exhaust fan and will it take the heat the bulb gives off and run it thru a duct hose to out of the room?

or would it be smarter to run the duct fan as intake and have duct hose running to light hoood?

i was going to do exhaust on light hood lemme know if this would work or not.

and FYI, im buying 2 (6") ValueLine fans, one for intake and one exhaust.

just thinking about duct fan on hood as intake to cool it down, or if i should exhaust fan to suck lamp heat out

any ideas?