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OfflineMichael903
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Registered: 01/12/14
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Upper Hole Placement for Best Humidity - Monotub
    #21287409 - 02/17/15 11:06 AM (9 years, 10 months ago)


So I thought I would share my recent discovery about hole placement with regards to monotubs.  I've made several monotubs since I've started growing and have almost always had problems with my tub not maintaining enough humidity. I use the standard 6 hole monotub (2 on top 4 on bottom), each hole being 1 1/2" in diameter. Stuffing the bottom holes extremely tight and lightly stuffing the upper holes definitely helped a little but I still wasn't getting the result I wanted. I wasn't maintaining enough RH and I wasn't acheiving the nice dry streaks below the holes.

Instead of placing the upper holes as high up as possible, try to move them down about 4 inches or so from the top.  I suggest anyone having problems to give this a shot as it has significantly improved my RH.

My theory as to why this helps:  The substrate itself gives off heat and water evaporates off its surface, which causes an upward air movement within the tub. This pushes the humid air up.  If the holes are placed way up high, too much humid air gets pushed out of the holes/lid up top.  By lowering the holes the air is likely bumping into the lid (some CO2 and humid air escapes) and the rest rolls back down the inner sides of the tub. On it's way back down the air current pulls the colder outside air near the upper holes (due to unequal pressures), which causes the dry streaks below the holes (which is nice because it means your tub is getting fresh air as well).

Edited by Michael903 (02/17/15 12:04 PM)

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OfflinecronicrMFacebook
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: Michael903]
    #21287592 - 02/17/15 11:48 AM (9 years, 10 months ago)

don't judge humidity using your walls, look at the surface of your substrate...if the are beads of moisture on the surface you got 99% rh on ghe surface where it matters


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OfflineMichael903
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: cronicr]
    #21287692 - 02/17/15 12:06 PM (9 years, 10 months ago)

Yep I have beautiful beads on the substrate.

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Re: Upper Hole Placement for Best Humidity - Monotub [Re: Michael903]
    #21288022 - 02/17/15 01:22 PM (9 years, 10 months ago)

Quote:

Michael903 said:
Yep I have beautiful beads on the substrate.



perfect:super:


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It doesn't matter what i think of you...all that matters is clean spawn
I'm tired do me a favor

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Invisiblemogul
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: Michael903]
    #21290290 - 02/17/15 07:34 PM (9 years, 10 months ago)

Quote:

Michael903 said:
Yep I have beautiful beads on the substrate.





Did your subs lack beads of water with the high hole system?


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The Universe has a much greater imagination than we do, which is why the real story of the universe is far more interesting than any of the fairy tales we have invented to describe it. -Lawrence Krauss

Whenever you're feeling stupid....just remember....there's still people out there who think the earth is 6000 years old and man rode dinosaurs.

How long did dinosaurs roam? The time gap between stegosaurus and t-rex is longer than the time gap between t-rex and man.

If geologic time was compressed into a year....man would be born on December 31st at 11:00 pm.

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OfflineMichael903
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: mogul]
    #21293240 - 02/18/15 11:56 AM (9 years, 10 months ago)

Yeah the higher the hole the worse it gets. I've seen a lot of monotubs on here as well and almost always see tubs with higher holes appearing more dry than those with lower ones.

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Invisiblemogul
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: Michael903]
    #21294615 - 02/18/15 05:01 PM (9 years, 10 months ago)

Interesting concept.....I'd like to hear more opinions on this.  I will be starting new tubs soon....and with the very dry air here it may be a good alternative.


--------------------
The Universe has a much greater imagination than we do, which is why the real story of the universe is far more interesting than any of the fairy tales we have invented to describe it. -Lawrence Krauss

Whenever you're feeling stupid....just remember....there's still people out there who think the earth is 6000 years old and man rode dinosaurs.

How long did dinosaurs roam? The time gap between stegosaurus and t-rex is longer than the time gap between t-rex and man.

If geologic time was compressed into a year....man would be born on December 31st at 11:00 pm.

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OfflineMichael903
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: mogul]
    #21301535 - 02/19/15 10:18 PM (9 years, 10 months ago)

Yeah I'm in Wisconsin ha. I'd say just don't go up as high as possible, but don't go incredibly low either.

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Offlinesilverstem
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: Michael903]
    #21301717 - 02/19/15 11:19 PM (9 years, 10 months ago)

Honestly I like putting my holes as high as possible that way my fae is perfect don't get so fixed up on RH. Monotubs are ment to have good surface humidity not so much humidity up high. Sgfc are different because the amount of surface humidity givin off by cakes is no where near the amount coir gives off.thats why we use perlite in sgfcs.


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OfflineKizzle
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Re: Upper Hole Placement for Best Humidity - Monotub [Re: silverstem]
    #21301954 - 02/20/15 01:05 AM (9 years, 10 months ago)

This got me thinking. Maybe condensation isn't necessarily a bad thing.

If the air flow is such that the air has more time to cool before it flows out of the chamber some the water vapor would be returned to the substrate in the form of condensation that would have otherwise simply been spent raising the RH of the outside air had the cooling occurred after leaving the chamber..


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