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Offlinerobertc5271988
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Registered: 12/18/14
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Advice on my martha tek before I get started please!
    #20994264 - 12/18/14 01:51 PM (9 years, 4 months ago)

First off, I would like to thank all the experienced growers for their wealth of information, and for all the help they have given noobs such as myself!  I have read many threads and studied many teks, which I could not have done if it wasn't for all your hard work.  Now, I just need a little bit more help from you... please and thank you in advance. Also, I hope I'm posting this in the right place haha.

    I will give a little description of what I have so far.  I bought a 4 tier mini greenhouse, an ultrasonic humidifier, a mini fan, a hygrotherm, two pc fans with 12 v adapters, timers, and a waterproof 6500 k rope light.  This is not including the materials, ingredients, and other supplies to actually cultivate. This is just the stuff for the Martha. I can post pics if needed, just would have to take them.  It's not at my house so it might take a little while if they are needed/wanted.

  I set up the GH on legs to raise it, put a layer of plastic on bottom with a hole in the middle, and placed a weight in order for the condensation to drip into a pan. The US with a mini fan blowing up are on the bottom shelf, while they are both hooked up to the hygrotherm.  They both turn on at the same time so that the fan rotates the humidity from the US.  The rope light has a sticky back that sticks to the plastic of the GH extending from the bottom of one side, goes up along the top and back down to the bottom of the other side. This is hooked up to a timer for 12/12 on/off.  I already have the fans wired to the adapters, and also put DAP silicon around the exposed wires.  They are not hooked up to the GH as of yet, but will also be put on timers.  I was thinking of turning them on for a few minutes about every 4-6 hours.  The rooms in the building each have their own thermostat, and the heat in each room can be different from the others.  So for that room I would just keep it at where it needs to be during colonization and then for fruiting.

    Now, for the questions.  I was going to cut holes for the fans in the GH, but did not want to make a mistake in doing it after all the money and effort.  They are 120 mm fans at 74.48 cfm, two of them.  I was thinking of putting one at the top right blowing in, and one on the bottom left blowing out (I read that doing it the reverse is hard on the fans as the air inside the GH is heavier than normal air).  I was wondering if I should cut big holes the size of the fans, smaller holes, maybe just slits or poke holes where the fan is at?  Should I use some sort of filter? Will the filter get moldy from absorbing the moisture?  How long should the fans run (dimensions are 62Hx27Lx19W inches) and how often for FAE?

  I know Martha's are best for bulk, but I want to start out with pf tek cakes with added gypsum (not many, just to see if I'm successful).  The hygrotherm allows to get up to 95% humiditiy.  I would dunk and roll the cakes, and then put them in trays on top of perlite.  After being successful, I would move to bulk using Damien's Coir tek with added gypsum to trays, and Hawk's 50/50 casing tek.  Also, I would lower the humidity as I read not as much is needed for bulk trays.  Curious about whether to keep them in the trays, or take them out of the trays after colonization though?  I will do my first bulk with pf cakes as I already have all the stuff needed for that, then I will do another grow with wbs cakes.

  I'm starting with the Martha tek as i really like the idea, the automation, to tweak things, and I'm an electronic/gadget freak haha.  I would love any other recommendations, even if not pertaining to my questions.  Any type of criticism is acceptable.  Although, I decided against the coolmist for FAE as space and finances are factors, and already had the pc fans with adapters.  If this setup does not work, I will consider the coolmist.  Thanks again for any and all help!  And of course, this is for legal edible mushies...

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Offlinerobertc5271988
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Registered: 12/18/14
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Re: Advice on my martha tek before I get started please! [Re: robertc5271988]
    #20994627 - 12/18/14 03:03 PM (9 years, 4 months ago)

Upon doing more research I learned the formula for air exchange...

n=60q/v

n = number of air exchanges per hour
q = fresh air flow in cfm
v = volume

So, n=60*74.48/18.40625 [(62*27*19)/(12*12*12)=18.40625 cubic feet]
n=242.7870967742 air exchanges per hour, divide that by 60 to get 4 air exchanges per minute.  So, should I run it for one minute every 4 hours?

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OfflineCaesare
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Registered: 11/16/15
Posts: 28
Last seen: 7 years, 1 month
Re: Advice on my martha tek before I get started please! [Re: robertc5271988]
    #22533157 - 11/16/15 03:25 PM (8 years, 5 months ago)

good luck, you are more advanced than I.  But i suggest turn the bag upside down and you dont need a drip pan.  Just fold over the top (that was the bottom)

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OfflineMr Pink
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Registered: 07/11/18
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Last seen: 4 years, 5 months
Re: Advice on my martha tek before I get started please! [Re: Caesare]
    #25416779 - 08/27/18 12:44 PM (5 years, 8 months ago)

I’m also building a Martha. I had a lot of questions, and found most of the answers in RR(Roger Rabbits’ notes. He says as much FAE as possible. Also I think it was there, I read that most of your airborne contaminants are within three feet of the floor. That’s why I put my fresh air intake fan on top of the GH. I know that’s not much help, but RRs note will be if you take the time to read them. Amazing source. I’ll be buying his dvds very soon. Good luck.

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InvisiblebodhisattaMDiscordReddit
Smurf real estate agent
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Registered: 04/30/13
Posts: 61,891
Loc: Milky way
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Re: Advice on my martha tek before I get started please! [Re: Mr Pink]
    #25416929 - 08/27/18 02:14 PM (5 years, 8 months ago)

I would suggest finding relevant threads not ones that have died years ago. And all the people that posted in it haven't logged in in years. 
Don't bother digging up old dead stuff. Set the search to look for new relevant and/or time tested results prove stuff. Check out my search engine TEK in my links(in my signature)

Ive never seen a martha do as impressive as some tubs. And any martha grows ive seen that were impressive were done by experienced growers. And on top of that they're way less automated.
Worrying about calculating air exchanges is ridiculous unless you're trying to run a farm and grow hundreds of pounds a month.

You can grow a couple pounds a week with 4 tubs on rotation in a corner of a room and all you need to do is mist a couple times thru fruiting. No humidifier to fill and clean. No martha to clean. No condensation and water to wipe up and worry about.

Marthas are really best left for people with more than a few grows under their belt, you'll have a dick of a time trying to dial it in based on what you read about and think mushrooms want rather than dialing it in based on experience. If you aim for 99% humidity most noobs using tents grow a bunch of contamination.

If you design a fruiting chamber based on reading that you need X amount of air exchange and such and such a humidity you're going to have a bad time. Especially if you've also never grown a mushroom before and have no experience to base a design off of

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