Not sure.. but when mine comes in I will test the blow-thru and suck-thru to see which works best.. some say one way, some say the other.. it really comes down to design of the fan and the fluid dynamics of the setup.I'm still considering getting foylon which is 95% reflective but that's gonna be pricy.Maybe I'll upgrade to that after a grow or two.
Any other suggestions aesthetically?
And how much CFM will I lose running a fan through a filter?
heh, all looks great. You'll want to swap your cooltube fan direction to blow through the cooltubes rather than suck. Drawing heated air unnecessarily over the fan motor would... well.. suck. The fan motor needs cooling air, too. If it is at the head rather than the tail, the fan motor will run cooler.Also, this is my rough sketch for my new growroom. It is based on Al's SOG model, and it will be a freestanding room inside a buddy's garage.
I will construct the room out of 2x4's and plywood. I decided to put a wall between the flowering area and the rest of the room in order to decrease the amount of air I have to move, and to increase reflectivity. I will also line the walls of the flowering and mothering area with foylon.
In the space above the clonebox (about 5 or so feet), I am going to have a storage cabinet for all my growing supplies, so the room will be a completely self contained weed factory. I might even put a replica of Al's DIY Bud Dryer in there too so I'll never have to leave.
Oh, and ANY SUGGESTIONS ARE MORE THAN WELCOME!!! If any of you see a way to improve this operation in the space provide, please feel free to tell me!
Plywood is OK as long as you can keep it protected from spills. If your op's humidity is high enough to damage ordinary underlayment grade ply, it's too damn humid! Your op's RH should be running 30-50%.
Foylon's interesting stuff. I haven't seen it locally as yet. They make some interesting sales claims. Would like to see those claims tested (by one of us, thanks), but they seem confident that it is both visible and infrared reflective and even recommend it to stop heat loss through greenhouse floors. Fascinating, Captain.I'm still considering getting foylon which is 95% reflective but that's gonna be pricy.Maybe I'll upgrade to that after a grow or two.
Any other suggestions aesthetically?
If it's an axial fan- most of it. Axials are not suitable for use with filters. Pick a centrifugal for that job.
You haven't read through to the part of the thread where I worked out that my trays are actually 820mm^2 or 2'8" something and not 4' square.
I am not accustomed to use of feet & inches and simply misestimated when I wrote the lead post in the thread.Well, that too, but isn't that a given? This is a cannabis forum, fer fuck's sake.
I've read subcool's growroom 101 thread and he swears by it.Foylon's interesting stuff. I haven't seen it locally as yet. They make some interesting sales claims. Would like to see those claims tested (by one of us, thanks), but they seem confident that it is both visible and infrared reflective and even recommend it to stop heat loss through greenhouse floors. Fascinating, Captain.
Would an inline fan count as a centrifugal fan? Axials are just computer fans, correct?
correct
, but not all inline fans are centrifugal though.
Yep, having 4 separate trays & tanks allows you to do stuff like dose wk 5 plants with PK-13-14 for 1 wk only without dosing all the other plants sharing their tank.
I noticed a few things. One is the number of doors. Skip the doors, seperate the areas with panda film curtains. You will save your self a lot of money if you view this as an area needing to be insulated, like you would insulate any living space. Forget the plywood, it isnt necessary. You can install Styrofoam or any other closed cell formula product on the outside of the 2x4 wall you construct, put batts of insulation between the 2 x 4's and install panda film as your inside moisture barrier. Unless you are going to pull a permit and make it living space you will not need plywood or drywall on the inside, those are for fire retardation in occupied spaces. This makes it easier for any changes you have to make in your electric and plumbing systems, you don't have a wall to have to cut holes in. Cut a little flap out of the panda film and staple it above all of you recepticles, let it hang down over them, its not waterproof, it will stop spray from hitting them. VVI'm still considering getting foylon which is 95% reflective but that's gonna be pricy.Maybe I'll upgrade to that after a grow or two.
Any other suggestions aesthetically?
For many years, my rooms were simply hanging curtains of panda film attached to a lightweight rectangular timber frame screwed to the ceiling.
nah, dead easy. Just overlap a couple inches where joins have to be made and glue it with silicone sealant. Use tape to temporarily hold the pandafilm together until the silicone sets up.
I was thinking of just putting up the frame and lining it with visqueen, but this is going to be a permanent structure. I also hear that it is difficult to make a lightproof seal with panda film alone.
I don't mind cutting a few holes if it means better stability and reliability.
Sorry about that. So that means a 600w 90k HPS falls well short of ideal for a 4' by 4' area ( about1200mm^2) and provides an average amount of light for a 3' by 3' area?You haven't read through to the part of the thread where I worked out that my trays are actually 820mm^2 or 2'8" something and not 4' square.
Very true. However, in my case, I'm just a shithouse carpenter and lucky things stick together or stay apart...
I'm hugely lucky if all I get is a few small air leaks instead of a breeze... 
Agreed.
No, I'm sorry for not measuring it before quoting the figure!
You'd grow plants, for sure, but I think you may begin to get somewhat ordinary production on the fringe of the light coverage with a 600 over 4x4. It would be on the lower end of what I might suggest for a 4x4 table.