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Captain Cubensis
Bleeding HeartLiberal


Registered: 09/18/07
Posts: 648
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Which is better, fanning the inside or sucking air out via exhaust?
#7816633 - 12/31/07 11:03 AM (16 years, 1 month ago) |
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Would a continuous fan blade circulating air be better than just an exhaust fan sucking air out and in?
Seems like a gentle breeze fanning the tops of the casings 24/7 would be ideal?
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creamcorn
mad scientist



Registered: 03/13/06
Posts: 2,962
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: Captain Cubensis]
#7816921 - 12/31/07 12:34 PM (16 years, 1 month ago) |
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the point is to keep CO2 concentrations low
so a fan inside the chamber is just going to keep recycling the same CO2 laden stagnant air
its a bad idea for a lot of reasons: 1. a fan blowing right at your grow will lead to some undesired drying 2. a fan inside a high humidity environment (unless you purchase a specially designed one) will fail pretty quickly. 3. if you ever experience a contamination you're going to blow it around and spread it to everything
its real easy to provide fresh air to your grow without any sort of motorized gizmo. if its a rubbermaid tub, poke a bunch of holes around the sides at the level of your grow surface, and a couple in the lid. CO2 drains out the sides and oh so gently pulls fresh air through the top (a soldering iron works great to melt holes in rubbermaids without cracking them, smells a little...). use some creativity if your setup is different... a small opening in the top, and along the sides (or the bottom open in like a martha set up)
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Captain Cubensis
Bleeding HeartLiberal


Registered: 09/18/07
Posts: 648
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: creamcorn]
#7819741 - 01/01/08 11:34 AM (16 years, 1 month ago) |
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As far as the drying out part, the air the fan would be moving around is 100% humid, so how can 100% humid air dry anything out?
As far as blowing contams around, well wouldn't ANY FAE do that?
Certainly fanning manually with the lid off is as prone to said issue.
With a cool mist and proper hydration and misting of the casing layer, then what issues would a slow moving fan cause?
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veda_sticks
Cultivator




Registered: 07/29/07
Posts: 14,191
Loc: UK
Last seen: 4 years, 25 days
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: Captain Cubensis]
#7820098 - 01/01/08 01:38 PM (16 years, 1 month ago) |
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A fan blowing air into the fruiting chamber will not only be circling humid air but also introducing dryier air. Have u ever noticed that when you fan out a fruiting chamber humidity can sometimes drop for a short period of time??
When i fan my humidity can drop to 60% from fanning. I find it helps misting before you fan.
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thedefone
deus ex machina

Registered: 10/06/07
Posts: 1,883
Loc: Gondwana
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: Captain Cubensis]
#7820112 - 01/01/08 01:43 PM (16 years, 1 month ago) |
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Quote:
As far as blowing contams around, well wouldn't ANY FAE do that?
My guess as to why you would want the fan in the first place would be so that you can automate the set-up and not have to check it as often. So, if you were to get some green mold or something, that fan could blow mold spores all over your FC while you weren't looking.
Quote:
With a cool mist and proper hydration and misting of the casing layer, then what issues would a slow moving fan cause?
I guess my question is what benefits does it provide? Creamcorn is right when he says that a fan in the FC is just going to recirculate CO2
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Captain Cubensis
Bleeding HeartLiberal


Registered: 09/18/07
Posts: 648
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: thedefone]
#7823121 - 01/02/08 10:35 AM (16 years, 30 days ago) |
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Quote:
thedefone said:
Quote:
As far as blowing contams around, well wouldn't ANY FAE do that?
My guess as to why you would want the fan in the first place would be so that you can automate the set-up and not have to check it as often. So, if you were to get some green mold or something, that fan could blow mold spores all over your FC while you weren't looking.
Quote:
With a cool mist and proper hydration and misting of the casing layer, then what issues would a slow moving fan cause?
I guess my question is what benefits does it provide? Creamcorn is right when he says that a fan in the FC is just going to recirculate CO2
There are 10 holes drilled at the bottom of the FC, near the Cool Mist intake, which provide plenty of fresh air, so CO2 is virtually eliminated.
In fact, the 10 holes are providing so much fresh air that it can't keep the Rh above 92 or so, about 4 inches above the casing.
So with a light misting twice per diem the casing layer is in a near constant state of evaporation, with continuous fresh, oxygenated air replacing the itself above the casing.
Correct me if I am wrong, but evaporation is a key pinning trigger right?
So wouldn't a state of continuous, and consistent evaporation of the casing layer be ideal, providing it never dries out proper.?
Isn't continuous fresh air circulating above a casing good?
My question is, how do I achieve 100% humidity?
My foaf's Cool Mist can only get it to 90%.
Too many holes, or a crappy cool mist?
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thedefone
deus ex machina

Registered: 10/06/07
Posts: 1,883
Loc: Gondwana
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: Captain Cubensis]
#7823172 - 01/02/08 10:49 AM (16 years, 30 days ago) |
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Is this the same tub as the one in the other thread? You could try an ultrasonic to raise your RH...
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I am become death, the destroyer of worlds.
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: Captain Cubensis]
#7823215 - 01/02/08 11:02 AM (16 years, 30 days ago) |
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You keep asking the same questions and arguing about it. Perhaps we should lie to you and tell you your plan will work, so that we can see you fail.
That wouldn't be very nice though. Air circulation provides no benefit whatsoever and will only serve to dry out your substrate/casing and spread around contams. And no, you can't get 100% humidity and maintain it, so it will dry out your stuff.
Your plan is a solution in search of a problem, and will lead you to nearly certain failure. Take the wisdom of people with far more experience than you and quit posting the same arguments in multiple threads just to argue with the very people who are trying to help you.
-FF
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Captain Cubensis
Bleeding HeartLiberal


Registered: 09/18/07
Posts: 648
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: fastfred]
#7823242 - 01/02/08 11:10 AM (16 years, 30 days ago) |
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Quote:
fastfred said: You keep asking the same questions and arguing about it. Perhaps we should lie to you and tell you your plan will work, so that we can see you fail.
That wouldn't be very nice though. Air circulation provides no benefit whatsoever and will only serve to dry out your substrate/casing and spread around contams. And no, you can't get 100% humidity and maintain it, so it will dry out your stuff.
Your plan is a solution in search of a problem, and will lead you to nearly certain failure. Take the wisdom of people with far more experience than you and quit posting the same arguments in multiple threads just to argue with the very people who are trying to help you.
-FF
I really didn't think anyone was arguing at all, we are discussing.
If you are suggesting that air exchange is not important, then maybe you should do a search on it first.
Air exchange is not my idea by a long shot, and every mod will confirm to an extent that air exchange is a pinning trigger.
They may disagree with the benefit to constant, that is what this debate is all about.
If you can keep your casing layer moist via misting, then what is being dried out exactly?
How fast can a 90% humid air dry anything anyway?
I am sure there are peeps who know the answer to that!
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fastfred
Old Hand



Registered: 05/17/04
Posts: 6,899
Loc: Dark side of the moon
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Re: Which is better, fanning the inside or sucking air out via exhaust? [Re: Captain Cubensis]
#7823365 - 01/02/08 11:33 AM (16 years, 30 days ago) |
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What you are talking about has nothing to do with FAE. What you are talking about is blowing around stagnant air inside a FC.
People here get into a trap where they start with too much FAE which dries their substrate/cakes/casing and produces low humidity with wild swings, so then they start misting. Using misting to compensate for low humidity may work somewhat, but it's far from optimal.
If people would simply drill a couple holes, fill them with polyfill, and fan for about 2 seconds once or twice a day they'd get better results with far less work. All the fanning and misting going on may make people feel better and more in control, but it's just creating more work and can lead to a number of failures.
Anyhow, you've crossposted this same idea into multiple threads and you've been told that it won't work quite a few times by experienced growers, so how about letting it go already?
-FF
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