Floydism

Stanley blower exhaust..do it!

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Good luck on your crops everyone !

Journal-1:bagseed (male/failed)
Journal-2: Hashberry/Orangebud (current)

xtensity

So wait I don't use an intake fan.....?

What if air escapes through the open holes, marijuana odor? Or do I put a carbon filter over both holes ducting?

Stonewallace

Just like ya said
If your exhaust is running through a scrubber then the only air that's going to escape your cab is through the (scrubbed) exhaust. All the other air is just gonna get sucked in. voila no smell, only one scrubber, only one fan

Unless you mean open holes in the ducting or somehow through the hood? I don't have this problem and this is what I do.
scrubber=>(ducting)=>hood=>(ducting)=>fan=>exhaust
enough air is pulled in under the panda plastic I don't have any need for even an intake hole, much less a fan. There is no smell outside my cab.

Even if I had no scrubber, I would use some sort of vent filter or particulate filter to keep dust from gunkin up my fan. They can get gritty and nasty and noisy suckin dust.

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Stonewallace

and I ain't tryin to be accessory to this thread hijackin' but have you tried exhausting(using the fan to suck) the hot air out as opposed to blowing cool air over the light? Hot air rises, it doesn't make sense to me to blow cool air through your hoods, you should be pulling the hot air out. You could replace it with the squirrel cage if you want but it's not necessary. This is just how I do it anyway with my smaller set up.

I use approx 350 cfm on about half speed with a speedster for my 400 watt light and my cab stays nice and fresh. It's just a suggestion anyway I realize 2k of watts is gonna build some serious heat.

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xtensity

Wait so does a scrubber suck new air in also?

Can you explain how they work lol.

er What's scrubber vs carbon filter.
So I can just use 1 fan with a carbon filter sucking air out and it should create a vaccum and I wont need more air being sucked in with an intake fan? I don't want any smell to escape

Shouldn't I also have the fan always running if I don't want air to escape? What's the speed I should have it at based off container dimensions

Stonewallace

I use the term scrubber and carbon filter interchangeably, I think they're the same thing, at least when I say it they are. I'm referring to a carbon filter, like this.

I don't know exactly how you calculate what is required for your specific dimensions/wattage of your HID. But the fan would have to be running 24/7 exhausting air to prevent "unscrubbed" air from leaking. It will start smellin when your fan stops runnin'

This is exactly what I was trying to convey. You just said what I do and it works fine on my space which is approximately 4 x 4. One wall of my flowering room is made of panda plastic, so air can come in from underneath where it isn't stapled down. So I don't need an intake hole because the vacuum sucks fresh air in. It's called negative pressure, and a lot of people do it.

The only air that escapes is through my exhaust and is scrubbed air. So no "weedy" air comes out except MAYBE a little when I have it all opened up and I break the vacuum.

The only exception would be if your cab is like so solid and wooden on all sides with no cracks so that air wouldn't be able to seep into the vacuum at all. Or maybe if your grow is pretty big and that amount of air coming in wouldn't be enough.

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xtensity

So you can't smell it at all until you go to open the cabinet and break the vaccume? If you're just in there to water how long will it take before your room stops smelling like weed?

Also when you did this.

scrubber=>(ducting)=>hood=>(ducting)=>fan=>exhaust

What's hood?

Do I also need a fan blowing the plants to go ALONG with the the exhaust fan? Are they connected or something?

I would think be like......

<-ExitHole<-Carbon Filter<-Exhaust Open Hole <-

Arrows representing what the air goes through and the vector of it.

Stonewallace

Totally right, you can only smell scrubbed air which doesn't have hardly any scent and isn't smelly it smells like carbon I guess. I don't know how long, not very long (< hour?) I'm also kinda used to the smell of weed. It's a pretty fragrant plant, why would it matter if your room smells like weed for a few minutes? I mean...for someone that is growing it and I would imagine smoking it? If you have concerns like that you should really think about where you're going to be able to dry it once your done...because that is the most fragrant part of all in my opinion. But maybe it's just because I hardly smell em in my cab.....
OH and you had another thread about this right? you're growing with two cfl's in an enclosed rubber container? You would have to cut an intake hole at the bottom of one wall, probably under the exhaust if it's rubber it would be all completely sealed off. It wouldn't have to be very big but as long as one fan is exhausting no air would escape your intake it would only pull it in. I think usually people say intake should be twice the size of exhaust but look it up before you quote me. Are you planning to keep EVERYTHING enclosed in a rubber container? A scrubber, centrifugal fan, and two lights would be about all that would fit inside it...without your plants anyway. Plus unless you find a deal the scrubber and centrifugal fan will easily run you over $250 this whole thing does not seem practical to me. I would say if you're minds set on it with something that size just stick any fan in one side and a hole in the other to blow air through it and maybe get some air freshener?

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xtensity

I've got the math worked out... I can have 2 low rider 2 plants in there under LST bent at angles growing on top of eachother with lights hovering over them, lights clipped to the side of the pots, with cords running to outlet behind the crate. The Exhaust fan and
I can make my own carbon filter for cheap, or buy one from hope depot for like 40 bucks lol?
I've looked at how they would fit in the crate. The Fan to blow them would be clipped onto the side of one of the pots near the light, not in the way of the plants. The carbon filter, ducting, and exhaust would all be in the little 5-6 inch space next to the pots. It being a very small crate I planned on getting something like a 3 inch inline fan and getting a small carbon filter for that shouldn't be to much. Centrifugal fan?

Can I also not dry in the crate..? Drying takes 1-2 weeks? I can be without growing for that long lol.

2 Low Ryder 2 plants can easily produce me an ounce at 14 grams a plant or so. which is very low amount to produce. I smoke like hardly.... 3/10 gram aday and I'm good, and that keeps me buzzing for a while. So I should have time to keep this 1 o, dry it, then put it in jars to prepare it(forgot word), then get next grow started.

Anything wrong/impossible with what I've said here?

Do I really need a fan blowing on the plants in a 1.5x1.5x1.5 foot crate? Like I'm sure the vacuum effect would create enough wind in there. Wrong? Right? Correct me if I am wrong lol.

Stonewallace

Anything's possible. I don't know if they make inline fans less then 4 inches. You could check into some DIY scrubbers, but mine is not very big and it's about 19 inches tall and not DIY. I don't mean to discourage you either. It could work without an oscillating fan in a cab that size if you had your intake and exhaust on opposite sides so that air would pull through the whole thing. You could dry in the crate the same way i suppose if you were able to hang lines through it. There's very little you can do to make your room not smell like weed when you're trimming it though...

Your exit hole is your exhaust hole, btw since you have no hood which is like this



You would just put a scrubber in there and have the fan suck air through it and exhaust it out your uh "exit hole"

Hope it helps, good luck

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