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InvisibleCDS
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Fume hood exhaust question...
    #11316641 - 10/25/09 05:41 AM (8 years, 1 month ago)

So I'm building a fume hood to take care of the overpowering fumes that are ever prevalent in my lab... (The alcohol alone is almost enough to make me pass out)

I'm wondering if anyone has experimented with venting the exhaust into the sewer via the main vertical shit-pipe thing (the 3" PVC pipe that all the waste water goes to before it leaves the house)... I will install a Y fitting and hook the output of my blower to a reducing coupling to the pipe via some flexible dryer vent...

I don't see why it wouldn't work; I will be using an 8" inline fan blower (like the one used in Anno's flowhood tek), which generates about 700FPM @ 0" S.P.; I imagine that will be sufficient to move a good amount of air, despite the 8:3 reduction.

Does anyone know how to calculate the static pressure of ducting based on the length (and the size of a reduction) thereof?

Also if anyone has any experience with the aforementioned idea please let me know.

Thanks


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Re: Fume hood exhaust question... [Re: CDS]
    #11316875 - 10/25/09 08:08 AM (8 years, 1 month ago)

You're doing it wrong. Seriously.


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Re: Fume hood exhaust question... [Re: Doc_T]
    #11316976 - 10/25/09 09:13 AM (8 years, 1 month ago)

Wow!  Way wrong.  I don't know what to tell you.


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Re: Fume hood exhaust question... [Re: cne9999]
    #11322365 - 10/26/09 03:52 AM (8 years, 30 days ago)

Uhhhh... How about you tell me why you think it won't work...


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Re: Fume hood exhaust question... [Re: CDS]
    #11322695 - 10/26/09 07:13 AM (8 years, 30 days ago)

Well, to start with you shouldn't have fumes. Nothing in mycology uses anything that makes fumes.
Some vapor maybe, waft it away with your hand if you need to.


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Re: Fume hood exhaust question... [Re: Doc_T]
    #11325116 - 10/26/09 05:01 PM (8 years, 30 days ago)

Right before I put the bulk sub/ colonized grain in the tub, I clean it out with alcohol- if I do this anywhere other than in an enclosed room with no drafts, there is an increased chance of contams falling on my sub. After a few tubs the room is completely filled with alcohol fumes; wafting them away would be completely useless, the only remedy is to leave the room for long enough for them to settle, which is what I am trying to avoid...

Anyway I was simply asking whether or not my idea would work, not whether my procedure was correct or not. I'm just looking for a way to remove tainted air with a minimum distance of ducting. I know that real fume hoods use roof mounted blowers which create a negative pressure in long expanses of ducting; they also cost like $5k and up, and I have a few other things I need to buy first.

Specifically, I want to know if anyone knows whether or not sewers are under significant positive pressure... All drains, for example, have a U pipe in them so that they always have some water in them to block sewer gasses from coming up into the room - I'm not sure whether this happens because the gasses are lighter then air, or because of positive pressure in the sewer, or both - if it is the latter then this may not work, however if it is the former then it is simply a matter of whether or not the sewer pipes have sufficient volume to allow me to be able to vent the required volume of air through them, and if this can all be done while having the diameter of the source duct reduced to 3" (the diameter of the sewer inlet pipe).

Perhaps I should have been more specific initially, lol...

Thanks again!


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Re: Fume hood exhaust question... [Re: CDS]
    #11325265 - 10/26/09 05:28 PM (8 years, 30 days ago)

You don't need to go through all that. Wash the tubs with warm soapy water, air dry them.
But if you want to vent to the outside, sewer pipe would be the way to go- there's a gas vent after the U, if I'm not mistaken.

But it's sooooo not needed for mycology.


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Re: Fume hood exhaust question... [Re: Doc_T]
    #11325435 - 10/26/09 05:55 PM (8 years, 30 days ago)

vent it thru your drier vent.. or thru a window..
alcohol fumes are not big deal.. no need to send it to the sewer..

the main vent in your house that connects to your plumbing is a bad place for it..

every time someone flushes  they will smell your alcohol fumes.


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Re: Fume hood exhaust question... [Re: CDS]
    #11325481 - 10/26/09 06:03 PM (8 years, 30 days ago)

Quote:

CDS said:
I'm wondering if anyone has experimented with venting the exhaust into the sewer via the main vertical shit-pipe thing (the 3" PVC pipe that all the waste water goes to before it leaves the house)... I will install a Y fitting and hook the output of my blower to a reducing coupling to the pipe via some flexible dryer vent...






It would probably just take the path of least resistance and travel backwards and up to your roof vent.  You should be able to access your vent systems behind any sink.  It's usually only 2" so you'll need a powerful blower to move enough air to help.
RR


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Re: Fume hood exhaust question... [Re: RogerRabbit]
    #11327742 - 10/26/09 11:04 PM (8 years, 29 days ago)

My take is that if you have fumes, other than alcohol, you’re doing something wrong.  I can't think of anything I use that creates nocuous fumes; maybe one time when I killed some substrate and it came up smelling like ammonia but that's about it.  The hobby is a clean and innocous hobby.  Especially if you try going organic as I alwyas have been.

You might also have an aversion to alcohol.  Try something a bit less nocuous.  Try simple soap and water as mentioned earlier.  Then oust or Lysol. 

But creating a fume hood for a bit of alcohol tells me your using too much alcohol.

Just my


--------------------
  Say hello to my little friend.    and...      From Sonny
     
AFOAF's Coffee Experiment  //  Rye Berry Cakes  //  My FOAF  //  I killed my baby Cubes!
Get a freaking camera!  //  Roscoe 'Fatty' Arbuckle  //  I love P.c.Burma!


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Re: Fume hood exhaust question... [Re: cne9999]
    #11330114 - 10/27/09 10:09 AM (8 years, 29 days ago)

Roof vent... I didn't even think about that... But that makes sense- Do all buildings have roof vents? I know the main drainpipe is 3", but could the roof vent pipe be less or are they one on the same?

Also will soap and water kill trich and cobweb spores???

(I'm sure I do use more alcohol than I need to, but I'd rather use too much than not enough. Also I like how the alcohol evaporates quickly and leaves the tubs dry; if I would use some other less volatile cleaner then I would have to let them air dry which would leave them open to contams; either that or use a lot more paper towels to dry them (but how do I know my paper towels are sterile anyway))


-Thanks


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Re: Fume hood exhaust question... [Re: CDS]
    #11330132 - 10/27/09 10:17 AM (8 years, 29 days ago)

Quote:

CDS said:
Also will soap and water kill trich and cobweb spores???





No, neither will alcohol. But both will remove spores from surfaces. Then wash them down the drain.

By the time you get to the spawning stage, you don't need to be 'sterile'. Just clean.


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Re: Fume hood exhaust question... [Re: Doc_T]
    #11330156 - 10/27/09 10:25 AM (8 years, 29 days ago)

Quote:

Doc_T said:
No, neither will alcohol. But both will remove spores from surfaces. Then wash them down the drain.

By the time you get to the spawning stage, you don't need to be 'sterile'. Just clean.



Thanks Doc, you beat me to it. 

CDS - - What Doc said...  :cool:


--------------------
  Say hello to my little friend.    and...      From Sonny
     
AFOAF's Coffee Experiment  //  Rye Berry Cakes  //  My FOAF  //  I killed my baby Cubes!
Get a freaking camera!  //  Roscoe 'Fatty' Arbuckle  //  I love P.c.Burma!


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Re: Fume hood exhaust question... [Re: cne9999]
    #11330230 - 10/27/09 10:49 AM (8 years, 29 days ago)

So spores are far more resilient than bacteria and viruses?

That's why alcohol will kill the latter but only 250F heat can kill spores?


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Re: Fume hood exhaust question... [Re: CDS]
    #11330261 - 10/27/09 10:56 AM (8 years, 29 days ago)

Yup.  Spores are like little hard-shelled seeds but not seeds.  They are very resilient.  The best way to get rid of them is wash them away.  Or filter them away.  Or vacuum them away.  Or wish them away, oh forget that last one.  Or do all of the above!  :cool:


--------------------
  Say hello to my little friend.    and...      From Sonny
     
AFOAF's Coffee Experiment  //  Rye Berry Cakes  //  My FOAF  //  I killed my baby Cubes!
Get a freaking camera!  //  Roscoe 'Fatty' Arbuckle  //  I love P.c.Burma!


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Re: Fume hood exhaust question... [Re: CDS]
    #11330275 - 10/27/09 10:59 AM (8 years, 29 days ago)

Quote:

CDS said:
So spores are far more resilient than bacteria and viruses?

That's why alcohol will kill the latter but only 250F heat can kill spores?




Iodine solution will kill spores too. But it's not necessary, soap and water does what you want.


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Re: Fume hood exhaust question... [Re: CDS]
    #11330288 - 10/27/09 11:01 AM (8 years, 29 days ago)

jesus how much alcohal are you using here?


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Re: Fume hood exhaust question... [Re: nastos]
    #11330328 - 10/27/09 11:10 AM (8 years, 29 days ago)

It's probly more an issue of the size of the room- it is very small, therefore after 30 or so sprays of iso, the air is pretty toxic...


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Re: Fume hood exhaust question... [Re: CDS]
    #11330390 - 10/27/09 11:26 AM (8 years, 29 days ago)

your spraying it into the air?


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Re: Fume hood exhaust question... [Re: CDS]
    #11330482 - 10/27/09 11:46 AM (8 years, 29 days ago)

Quote:

CDS said:
So spores are far more resilient than bacteria and viruses?

That's why alcohol will kill the latter but only 250F heat can kill spores?




No.

We pressure cook to kill bacterial endospores.  Fungi spores and live bacteria are killed by temperatures at or below boiling.

If your alcohol is evaporating away fast, you're probably using 99%, which is ineffective, and may also create an explosion hazard.  70% alcohol has much more contaminant killing power.

As said already, if it's fruiting chambers or bulk substrate trays you're cleaning, simply wash them out with soap and water. Save the alcohol for your gloved hands when doing sterile work/inoculations.
RR


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