My New Cab

[Don Piano]

Or you can cut a length of thin wood (like a 1x2) and attach it to one door on the inside, so when the other door shuts it shuts against the board (and you can put weather stripping on that)

[gonejah17]

Originally Posted by Don Piano

Or you can cut a length of thin wood (like a 1x2) and attach it to one door on the inside, so when the other door shuts it shuts against the board (and you can put weather stripping on that)

Yeah thats kinda what I did on the last cab. Check it out if u want or Ill post pics hjere later.

got it prettry set right now, gotta run and do some IT shit and hit the studio, but Ill be back in a few hours. Wanted to throw some pics up real quick

had to get ghetto with it w some aluminum tape, but if it aint ghetto it aint me

Ill explain exactly what I did when I get back, literally have no time lol

One thing I will explain is I put a temporary light trap on the cab exhaust, the filter is coming within the next few days and then Ill take it off. so everything from the whtie 4"elbow on is just temporary, ittl look much nice with the filter.







K so Im lightproof now and I might flip to 12/12 tofay or tomorrow.

Ill give more info in a little bit

[Don Piano]

. Do it to it. Glad yer light tight!

nice job man, looks wicked tight. thanks for the advice Don and Gonejah, i put some wood up and it works a lot better, just need to add some weather stripping to it.

[Dewave]

Gonejah

Look at the posts in Grow room designs, I posted something for ya.

[Don Piano]

H-Dubb, Glad to help. Was really a no brainer. Suprised the thought never crossed your mind. THE DOCTOR'S PRESCRIPTION: Smoke more pot.

Just playing with ya. Get the stripping and yer good to go now. Glad to hear it.

[FullMetalJacket]

Hell of a cab man...Nice clean and well thought out...

[gonejah17]

thanks man, took a few shortcuts at the end, but all is well -- I might clean her up a little here after I run this monster

Thanks for stoppin thru. Filter should be here tomorrow!!!

[FullMetalJacket]

Originally Posted by Don Piano

Hey IBowl, Paint the inside of the elbows with flat black spray paint. Just make sure to scuff the inside with steel wool or the like, first, and clean and dry it out before painting it. Depending how big your fans are for the extra intake. I am guessing that your fans are 3"-4" in size and Intakes should be about 1.25 times larger than your exhaust. So if you have a 4" fan, you need a 5" intake.

Hey gonj, whats taking them so long on that vent?
Good to hear that the light is cooling well though.

I dont understand the logic behind "Intakes should be about 1.25 times larger than your exhaust". I have read it alot and think it is incorrect. Your intake can be .5 the size of your exhaust as long as your exhaust fan can handel the extra Static Pressure. If you have a scientific explaination i would love to hear it.

I actually think it is a horrible idea personally, unless you can use one of those snazzy darkroom vents...they do have some air resistance so the larger size makes sense for them...

[Don Piano]

Been doing this a long time. I promise, a 5 inch passive intake and a 4 inch exhaust will have plenty of negative pressure.
people can actually use double the intake area as exhaust and they can still have negative pressure. Try it out. Reading will give you some knowledge, but doing will get you experience.
The only time you would use a smaller intake, is when using an active intake, this means when you are using a fan to blow air in as well as a fan exhausting out. That way you will never pump in more air than can be exhausted.

Read more.

Sorry to have to do this in your thread Gonej

One added note. I had two 3" intakes and one 4" intake, and had a 4" exhaust on my last cab, and still had negative pressure.

[gonejah17]

no worries man.

Check it out -- So I was like fuck it Ill try some co2, but with the co2 on and the exhaust off A) no negative pressure and B) the humidity rises (not too crazy but still)

What window locks are u referring to exactly?? Im thinking Im gonna need them if I plan on running co2.

Im pretty sick today -- get at u later

[FullMetalJacket]

I dont think this is a bad topic for the thread as these forums are aout sharing ideas..I am building a cab now and others looking for ideas search these designs...just dont want to mislead them in case they are reading as you suggest. Gonej if you mind ill surely move the discussuion elsewhere. I just found in my closet i listened to someones advice and had a passive 7" intake for a 6" exhaust. It was harder to light proof and i had better results when i changed it to a 4" passive intake. The air just rushed in/around faster. I also THINK certain fans have run at a peak at a certain level of resistance.

Im not trying to argue with you man and I have read alot of people saying the same thing you are already. Even a few respected growers. But no one can explain the logic other than they read it somewhere else or tried it. But when they tried it, it wasnt necessairly the intakes but some other variable that cause the better results. I agree if you use a cheap exhaust fan..you need a large intake. Or a fan like the one i see you are using in your attic where it can't handel any SP. I know you can have negative static pressure with a larger intake (im not an idiot).. you can even have negative static pressure without a door..but that does not mean it is better...

Thanks for the reading advice. I have read alot and do not think that reading is the solution to my problem. There are alot of people who just repeat things out there without thinking about the science of it all.... Your reading advice is also why i am just trying to clarify this. So that other readers don't stuble on your post and take that "Intakes should be about 1.25 times larger than your exhaust" at face value without considering other variables.

Trust me man i appreciate what you do on here and agree with most of what you say and you have helped me.. much respect. I just dont want people to take that at face value...

[gonejah17]

I dont mind at all, the more info the better IMO.

U guys are keepn it civl and mature and I think thats what its all about.

Just maintain the respect is all I ask.

[Don Piano]

and civil it will be Gonej.
High velocity air coming through the intake, causes air mixing or dilution.
Low velocity air coming through the intake, causes air displacement.

An exhaust larger than your intake will dilute
An intake larger than your exhaust will displace

[FullMetalJacket]

"An exhaust larger than your intake will dilute
An intake larger than your exhaust will displace"

are you talking about CFM or area of the exhaust intakes/exhausts?

what would you suggest for someone that uses carbon filters where the exhaust area is essentially large (due do the surface of the carbon filter)?

If I had a 12 ich exhaust pulling 200 cfm in an 200 sq ft room would a 6 passive exhaust not create a low encough air velocity where you still get displacement over dilution?

TY sir