Noob's guide to growroom set-up : a work in progress

Thankyou Rhizome for doing this.. It is very informative and have learned alot so far.

If I do start a grow room will definitely use this thread as a guide! :thumbsup:

read article in one breath. Thanks for the help...after searching it was the answer I was looking for.

Using a dedicated system to cool your lights, would one simply leave out the light multiplier in the below equation to figure out the exhaust fan size?

Quote:

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Originally Posted by rhizome

We have a 4x4x6 room. Our total duct length is 13'. We're using a filter. Our math now looks like-

4x4x6 room= 96 CF. Divided by 4 minutes is 24 CFM required.
24 CFM + 130% ( 10%x13')= 55.2 CFM ( I'm gonna round to whole CFM, to try to minimize decimal over-runs)

(55CFMx1.5)x1.5= 124 CFM â?? to allow for our two 90 degree bends.

124 CFMx1.3 ( to allow for air velocity lost to the filter) = 161 CFM.

So we're looking at a 161 CFM fan.

But wait- we haven't even thought about how our light's going to effect this. We could go off into a discussion of determining system effeciency by measuring intake and exhaust temperatures so that we could calc differential temperatures, but I don't know how to make the little â?? deltaâ?� symbol on my laptop keyboard, so I'm gonna skip that and assign yet another load factor...

For a 250HPS- multiply by .75
For a 400- multiply by 1
For a 600, multiply by 1.3
For a K, multiply by 1.6.

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sorry to multiple post.

to cool 2 600 watts in the supersun with the above dedicated system for the lights would one need just a booster fan or an inline fan such as a can fan?

I have been looking around for 70 cfm fans and am unable to find any at this point. let me know.

Quote:

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Originally Posted by el chupanebre

Using a dedicated system to cool your lights, would one simply leave out the light multiplier in the below equation to figure out the exhaust fan size?

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Yep, that'd work.

Inline cooling 2 600's, I'd be looking @ a six inch inline.

I'm cooling one 600 with a 4" fan and ducts, and it's just not quite enough. Switching to 6" soon, along with re-routing ducts so there are less bends (a big factor). Also I find that the only way to get a 600 nice and close to the plants is to have dedicated light ventilation. And you need it if you are running CO2. If I could only give one bit of advice it would be to not skimp on ventilation. For HID, you really need to spend as much on venting as lighting.

Nice write-up rhizome.

Rhizome that is some thorough learned you making me. Your efforts are so very appreciated. I am going to be taking my second stab at setting up a room in the upcoming months and will use this information, or at least what i understood(doh).
I was trying to cool 6 600W with a 10 inch canmax. With ducting that looked like a yankee stadium pretzel. not sure it was really doing the job (another doh)

Great information!

Gotta love growing outdoors :) Most everything is free cept the labor.

What about incorporating parent room(s) inside your work area. Like for mother and father plants. Start up budget required = ? Best sources for economical(energystar type stuff) equipment = ?

What kind of increase in the power bill should someone expect?

Lets say for a daily smoker or a medical user.

This is a permalink to an instruction for calculating your power bill from a grow:
http://boards.cannabis.com/basic-gro...ml#post1885957

Combine that with the information Rhizome gave on the first page, referring to 'three Marley types', and you have yourself a figure.

rhizome . . . great information...thanks!