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Invisiblebrindle foxx
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Registered: 11/11/18
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Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other?
    #26577967 - 04/04/20 07:42 PM (3 years, 9 months ago)

If I’m planning on doing lots of open air work- (innoc-agar-g2g pretty much all sterile work) will a Fan filter unit work? I like how they are sleek and cover a wide area but are they able to compete with a flow hoods power and resistance? Thanks for any input. I guess the main pro here would
Be the Fan filter is less expensive to purchase pre built. I’m not opposed to building my own FFU or flow hold either.


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Offlinerumfor69
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: brindle foxx]
    #26578004 - 04/04/20 07:59 PM (3 years, 9 months ago)

I've asked about this here too and hoped for an answer I did some research
and found a company in Canada that sells them for $300. Everything about
them says to me they work but with some limitations.

Check out this sponsor sight they sell the exact same thing with
the exact same pictures and they talk a little bit about it's limitations
https://fungi.com/collections/laboratory-equipment/products/self-contained-air-filtration-unit

Basically it sounds like you don't just wanna set it in a big open room
that has a high air particulate count. But instead use it in an already
air filtered space where the air has been cycled through a HEPA filter
multiple times before you turn on the ffu and start working. I'm guessing
though


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Invisiblebrindle foxx
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Registered: 11/11/18
Posts: 420 420 Posts!
Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: rumfor69]
    #26578016 - 04/04/20 08:04 PM (3 years, 9 months ago)

Quote:

rumfor69 said:
I've asked about this here too and hoped for an answer I did some research
and found a company in Canada that sells them for $300. Everything about
them says to me they work but with some limitations.

Check out this sponsor sight they sell the exact same thing with
the exact same pictures and they talk a little bit about it's limitations
https://fungi.com/collections/laboratory-equipment/products/self-contained-air-filtration-unit

Basically it sounds like you don't just wanna set it in a big open room
that has a high air particulate count. But instead use it in an already
air filtered space where the air has been cycled through a HEPA filter
multiple times before you turn on the ffu and start working. I'm guessing
though





I’ll check it out thank you! Yea I seen some growers using it in open spaces so I’m thinking it’s good enough? I like how low profile they are with a big area and possibly quieter? If a room has no windows,open door, air vent, fans it may just be all you need then.


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Offlinerumfor69
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: brindle foxx]
    #26578059 - 04/04/20 08:41 PM (3 years, 9 months ago)

That's my guess too. Here is the company I mentioned and no joke this
unit was listed for $300 a few weeks ago and is now double that lol


https://pharma-machineries.com/products/laminar-air-flow-ffu-hepa-filter-with-fan-or-motor-unit?_pos=6&_sid=87acf09ca&_ss=r


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Invisiblebrindle foxx
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Registered: 11/11/18
Posts: 420 420 Posts!
Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: rumfor69]
    #26578183 - 04/04/20 09:40 PM (3 years, 9 months ago)

Quote:

rumfor69 said:
That's my guess too. Here is the company I mentioned and no joke this
unit was listed for $300 a few weeks ago and is now double that lol


https://pharma-machineries.com/products/laminar-air-flow-ffu-hepa-filter-with-fan-or-motor-unit?_pos=6&_sid=87acf09ca&_ss=r



Needs


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Offlinerumfor69
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: brindle foxx]
    #26578196 - 04/04/20 09:47 PM (3 years, 9 months ago)

They say best offer pricing somewhere on their site too. If I order one
I'm definitely gonna call and ask them about the $300 price that it was.
They can be hooked together to so maybe they'd sell ya two for $600 and
you can have a 4'x 4' wall flowhood lol


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OfflineGrungeman17
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: rumfor69]
    #26578229 - 04/04/20 10:05 PM (3 years, 9 months ago)

The units you guys are discussing are positive pressure units/filters for whole clean rooms. These do not produce laminar flow. They will scrub your air in a given room and to a certain extent, if you.using one in a small area you are certainly better off any added purification you will help yourself. But the big thing is, the frequency of flow will be considered "turbulent" clean...but not in the unfied flow of a 1.0+ pressurized flow hood. These units cannot build pressure like laminar flow unit because there is not a plenum. I am new to flow hoods, with that said, im balls fuckin deep rn constuctiing my first one. Im having a blast. and the only  HVAC specs I accepted for my build were wcertified laminar flow specs. There are old threads where a Rabbit lays out HVAC pretty damn well. Its where everyone needs to start. Get away from the units for one day and just learn what and why on laminar flow. Those positive p. Units discussed are being used for the overall air in some top end mushroom farms, on top of the flow hoods.


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InvisibleinskiM
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: Grungeman17]
    #26579815 - 04/05/20 03:40 PM (3 years, 9 months ago)

Quote:

Grungeman17 said:
The units you guys are discussing are positive pressure units/filters for whole clean rooms. These do not produce laminar flow. They will scrub your air in a given room and to a certain extent, if you.using one in a small area you are certainly better off any added purification you will help yourself. But the big thing is, the frequency of flow will be considered "turbulent" clean...but not in the unfied flow of a 1.0+ pressurized flow hood. These units cannot build pressure like laminar flow unit because there is not a plenum. I am new to flow hoods, with that said, im balls fuckin deep rn constuctiing my first one. Im having a blast. and the only  HVAC specs I accepted for my build were wcertified laminar flow specs. There are old threads where a Rabbit lays out HVAC pretty damn well. Its where everyone needs to start. Get away from the units for one day and just learn what and why on laminar flow. Those positive p. Units discussed are being used for the overall air in some top end mushroom farms, on top of the flow hoods.




Incorrect, fan filter units produce laminar flow very nicely because they employ special baffle systems inside the plenum which evenly distributes the air flow over the entire back surface of the filter.

My Laminar Flow Hood is built around one of those units and it works perfectly at 90-100fpm with even laminar flow over the entire surface of the filter, the information you have is old, outdated and not correct.


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Offlinerumfor69
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: inski]
    #26580090 - 04/05/20 05:52 PM (3 years, 9 months ago)

I was really curious about the information. The many different companies
that sell these things call them laminar flow fan filter units. It's such
great news to hear a TC uses one of these and enjoys the success from it.

Thank you inski for bringing the light. If I can ask can you recomend a
supplier to buy them from. That one I found in the link above seems solid
but more information here I think would be great for everyone now and in
the future with the extreme price jacking happening on prefab flowhoods.


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OfflineGrungeman17
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: rumfor69]
    #26581503 - 04/06/20 11:31 AM (3 years, 9 months ago)

If you get on youtube, there's a guy from fresh cap mushrooms, a full on mushroom bussiness he covers this and was stuck in this facat himself. He covers a few things about it. And there differnces. He employs both, I always felt like it would proably work, i wasn't sure how it would without a plenum, that question is answered. obviously it does. But the primary use is it is a positive pressure system for a room. That is it's intended use. If your getting 90-100 thats not bad. But i wouldnt want that number to drop. Do prefilters mount nicely? I dont see how the old information is incorrect persay...just something else may also work. But with that said, im about to complete a flowhood build for 300.00 flat. Those fan filter units will cost about that used. You could get one with more or less life on it hard telling. I had the choice. I chose a conventional flow hood. Do what works for ya. Oh btw, if anyone wants a find since I decided to build my own. https://www.ebay.com/itm/322517979676


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Edited by Grungeman17 (04/06/20 11:40 AM)


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OfflineGrungeman17
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: Grungeman17]
    #26584198 - 04/07/20 02:29 PM (3 years, 9 months ago)

Litterally hope no one checks out a lab grade flow hood for 385.00 obo In that link, You shouldn't doit.


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Offlinerumfor69
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: Grungeman17]
    #26584216 - 04/07/20 02:40 PM (3 years, 9 months ago)

Meh if I buy it and it doesn't work I'll just use it to filter my
beer and sauerkraut farts while I sleep


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Invisiblefilthyknees
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: rumfor69]
    #26584324 - 04/07/20 03:43 PM (3 years, 9 months ago)

I know tedsdead uses a ffu.

Seen here doing many bags, I think he'd mention having issues with it :shrug:

https://www.shroomery.org/forums/showflat.php/Number/26573335


--------------------
But if you're in a hurry, and really got to go
If you're in a hurry, might have to find out slow
That it's one thing to try and another to fly
You get there quicker just a step at a time
It's one thing to bark, another to bite
The show ain't over till you pack up at night


Edited by filthyknees (04/07/20 03:54 PM)


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OfflineWaveydoctor
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Re: Fan Filter Unit (FFU) vs Laminar Flow hood what is the consensus thoughts on one or the other? [Re: Grungeman17]
    #28517155 - 10/24/23 09:26 PM (3 months, 2 days ago)

Fresh cap built his flow from outdated/ rough estimates. Even the famous stamets cultivator book is wrong on sticking to the filters known SP. RR has noted this along with many other Myco enthusiasts/elites as understanding has grown over time.
I recall people posting about having their work blow about.
Most of the helpless Myco community probably have mismatched filter-fan, fuelled by an abundance of misconceptions. (Actually reflects a shroud of vision in the race  to assimilation , human behaviour ay)
Not to say it didn’t work , was a huge stepping stone I bet but More so a rough estimate (probably based on some kinda rational calculation) to todays understanding & aim on precision.

Iv only just noticed this is an almost 4 year old post but I’m not deleting this now lol
May be helpful to a future aspiring hood craftsman ,who knows.


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