The BubbleHead Gang

Dystopia

Dystopia

Active Member
grownavy1091 said:
Mostly that sounds perfect. i was just hearing alot of mixed talk about the cooltube acting like a magnifying glass and burning the canopy of the plants, but I think that the cool tube will be perfect. Quick question for ya, do I need 2 inline fans? Or can I just use 1? I'll be growing in the growlab 120 3' 11''x3'11''x78''. I hope the 400W HPS covers enough ground for the 4-5 plants I'll be doing. I apologize for all of the questions, this ventilation thing is kicking my butt. I really want to go with the 400 Watt for the Stealth Hydro dual spectrum setup, but I want to have it properly ventilated, feel me??
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Grownavy1091
If you go back to Post 308 on page 31 (https://www.rollitup.org/dwc-bubbleponics/220083-bubblehead-gang-31.html) you’ll see I diagrammed out two options for ventilation: 1) ventilate light and tent through one fan; or 2) ventilate light and tent separately using two fans.

Option 1 will work, option 2 is more efficient.

Sizing the fans depends on which option you choose. I’ll show you how I now figure fan sizing:

First, figure the minimum size of the fan using this formula:

Vrate = (3.178 x W)/(T2 - T1)

Vrate is in CFM (required size fan)
W is in watts( bulb)
T's are in degree F. T1 = inlet temperature, T2 = what you want tent temperature to be.

So let’s say you’re using a 400 watt HPS, your inlet temp is 72* F, and you want your tent to run at 80* F.

Vrate = (3.178 X 400)/(80 – 72) = 1271.2/8 = 159 cfm

So a 159 cfm fan is where you start.

Add 20% if you are adding a filter in line with the fan: 159 + (159 X .2) = 190 cfm

Add 5 – 20% for length of ducting, number of turns, etc. Let’s say you have short ducting with two turns, let’s add 8%: 190 + (190 X .08 ) = 205 cfm.

Add 25% if you live in a hot climate. 260 cfm.

So, if you’re going with option 1 (1 fan to cool light and tent) you would need, at a minimum, a 205 cfm fan if you’re living in a mild climate, 260 cfm in a hot climate. More is better, so I would go with like a 275 cfm fan.

If you’re going with option 2 (2 fans to vent tent and light), then you would split up the fans to equal 205 or 260. For instance, if you’re growing in a 4 X 4 X 7 tent, you have 112 cubic feet. If you want to swap out the air in the tent every minute (for the reasons I enumerated in post 308 ), you would need a 110 cfm fan. Add 20% if you connect a filter to that fan: 110 + (110X .2) = 132 cfm to vent the tent.

205 – 132 = 73 cfm; 260 – 132 = 128 cfm. That means you would need about a 75 – 130 cfm fan to cool the light. I would get two 130 cfm fans to vent the tent and light for option 2.

Hope this helps; I’m retired Air Force myself, always willing to help out a squid. bongsmilie
 
grownavy1091

grownavy1091

Active Member
Dystopia said:
Grownavy1091
If you go back to Post 308 on page 31 (https://www.rollitup.org/dwc-bubbleponics/220083-bubblehead-gang-31.html) you’ll see I diagrammed out two options for ventilation: 1) ventilate light and tent through one fan; or 2) ventilate light and tent separately using two fans.

Option 1 will work, option 2 is more efficient.

Sizing the fans depends on which option you choose. I’ll show you how I now figure fan sizing:

First, figure the minimum size of the fan using this formula:

Vrate = (3.178 x W)/(T2 - T1)

Vrate is in CFM (required size fan)
W is in watts( bulb)
T's are in degree F. T1 = inlet temperature, T2 = what you want tent temperature to be.

So let’s say you’re using a 400 watt HPS, your inlet temp is 72* F, and you want your tent to run at 80* F.

Vrate = (3.178 X 400)/(80 – 72) = 1271.2/8 = 159 cfm

So a 159 cfm fan is where you start.

Add 20% if you are adding a filter in line with the fan: 159 + (159 X .2) = 190 cfm

Add 5 – 20% for length of ducting, number of turns, etc. Let’s say you have short ducting with two turns, let’s add 8%: 190 + (190 X .08 ) = 205 cfm.

Add 25% if you live in a hot climate. 260 cfm.

So, if you’re going with option 1 (1 fan to cool light and tent) you would need, at a minimum, a 205 cfm fan if you’re living in a mild climate, 260 cfm in a hot climate. More is better, so I would go with like a 275 cfm fan.

If you’re going with option 2 (2 fans to vent tent and light), then you would split up the fans to equal 205 or 260. For instance, if you’re growing in a 4 X 4 X 7 tent, you have 112 cubic feet. If you want to swap out the air in the tent every minute (for the reasons I enumerated in post 308 ), you would need a 110 cfm fan. Add 20% if you connect a filter to that fan: 110 + (110X .2) = 132 cfm to vent the tent.

205 – 132 = 73 cfm; 260 – 132 = 128 cfm. That means you would need about a 75 – 130 cfm fan to cool the light. I would get two 130 cfm fans to vent the tent and light for option 2.

Hope this helps; I’m retired Air Force myself, always willing to help out a squid. bongsmilie
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Dystopia, thanks again, I totally forgot about that post, u pretty much answered my question back then. squid eh? well we won't get started on the air force. lol ( really wish i went there any way uncle sam treats ya'll like royalty compared to the rest!) but thanks for the formula, I might have to go with option 1 until I get a little more cash. thanks again, if you show me how to rep ya, I'll be more than happy to
 
purpdaddy

purpdaddy

Well-Known Member
nikk said:
yeah man i feel you,im a couple of weeks into this grow right here,it is what it is tho,huh.
you remember who this is right?
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yea this is nikkelz..i remember ya..they banned the other name right?you gotta watch what you say round here.
 
nikk

nikk

Active Member
purpdaddy said:
yea this is nikkelz..i remember ya..they banned the other name right?you gotta watch what you say round here.
Click to expand...
yes sir,but i learned my lesson,this time im flying straight,i finally invested in a hps,im gonna give it another week before i fire it up,my last grow was good to me,got great reviews from my peoples,they put the pressure on me to do another one,the only difference is im growing something that i picked up outta the country....punta roja ftw.
oh and even tho im not a true member of the bubblers,i consider myself a diplomat,because i own a bubbleponic system but i hate labels...lol
 
Roseman

Roseman

Elite Rolling Society
grownavy1091 said:
I've got a question for the bubbleheads, and I don't mean to interrupt with my question, but which reflector do you all think would be good with the growlab 120? a cooltube, or regular hood? I wanted to do a cfl grow, but seeing that I could do the entire grow with just one light sounds alot more appealing, I just want to make sure I've got all the right fans/blowers, etc. that I need. Please help!!! lol
Click to expand...

get the cool tube.
 
Roseman

Roseman

Elite Rolling Society
This is the BubbleHead Gang Thread.

I'd like to get the BUBBLEHEAD gang more organized and more recognized too..

I'd like to have a BubbleHead Contest. I'll provide some shirts or grow stuff as prizes.
Any ideas? Suggestions?

I'd like to see someone take over the BUBBLEHEADS SOCIAL GROUP. I started it, not knowing what I was doing, but will gladly delete it and let someone else take over.

I'd like to see everyone have the same signature logo, instead of us using two different ones.

I'd like to nominate Mostly Crazy For Chief BubbleHead or President or CEO of the Board of Directors.


THE BUBLEHEAD GANG!

Right click the BubbleHead Logo, save it to your computer, then upload it to your signature.

By adding this bubblehead Logo to your signature, and claiming membership to the BubbleHeads, you agree to be very helpful to newbies with DWC and Bubbleponics with patience and caring and make all other BubbleHeads proud to be a member of the gang. If you do not know the answer, go get someone else from the BubbleHead Gang to help.

THE BubbleHeads get a 10% Discount at www.stealthhydro.com by using the word BUBBLEHEADS as a Discount Coupon.
Send this invitation to anyone you like to invite in, and know that they know DWC and Bubbleponics.

May the Bubble Force be with us all.
 
Roseman

Roseman

Elite Rolling Society
We will have a BubbleHead Gang Meeting, here, on this site, Monday at 9:00 E.S.T.
to discuss our Mission Statement and membership.
Mostly Crazy has agreed to be our Chief Bubblehead, if he is acceptable to everyone and everyone agrees.
We will discuss all that then, Monday at 9:00 p.m EST.
Here:
The BubbleHead Gang - Marijuana Growing
 
Roseman

Roseman

Elite Rolling Society
edsthreads said:
Nice to see your still a big fan of DWC Roseman I am still using the DWC method after 3 years growing & have never looked back - hydro rules!

Glad to be a part of the Bubbleheads gang..
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Just like SpongeBob Squarepants,, we grow under water in bubbles!
 
Roseman

Roseman

Elite Rolling Society
Knickers said:
I'm a very new member here, but a long time reader, and I would like to be a part of a group that nurtures new growers and provides an open forum for the more experienced. I beieve that the BubbleHead Gang do just that, and as I have made the move from AG to DWC I'd like to join in the fun! As such I have added the bubbleheads avatar to my sig and look forward to sharing pictures of my current grow when I get back home tomorrow!
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Welcome to the gang, please download and display our logo.
 
Roseman

Roseman

Elite Rolling Society
i4204lyfe8424 said:
When's this meeting at and whats it all about?
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On this thread, Monday, tonight, at 9:00 pm EST we will nominate Mostly Crazy as Gang leader or what ever title the gang likes best. We will also try to have a Mission Statement or Purpose. It 's a deomocracy gang.
 
Dystopia

Dystopia

Active Member
grownavy1091 said:
Dystopia, thanks again, I totally forgot about that post, u pretty much answered my question back then. squid eh? well we won't get started on the air force. lol ( really wish i went there any way uncle sam treats ya'll like royalty compared to the rest!) but thanks for the formula, I might have to go with option 1 until I get a little more cash. thanks again, if you show me how to rep ya, I'll be more than happy to
Click to expand...

Yeah, option 1 is cheaper, but we’ll see how you feel after you hear a 275 cfm fan, especially if you go with a cheap one! You will also need to make sure your tent inlet is sized appropriately to handle a 275 cfm fan. For me, things are much easier and quieter when I vent my light separate from the grow area. I’ve spent twice as much on my setup then I needed to because I tried to go the cheap route the first time around…

Leave it to the pointy heads to figure out the math, though, lol! I spent a couple of years at Keflavik NAS in Iceland, there was a lot of flak about how much better the living conditions were for the AF personnel versus the Navy. And when I was in Saudi during the Gulf War, while the other services were living in tents in the desert we were up in the mountains living in a walled compound with air conditioned mobile homes, pool, tennis courts, miniature golf course, paid access to a resort on the Red Sea for diving, and every Friday they’d fly in a pig for roasting on a spit. I lived better then than I do now, lol!

Click on the scales at the top right of this post to rep.
 
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