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teladi
FUNKSOULBROTHER


Registered: 06/27/17
Posts: 1,189
Loc: South Africa
Last seen: 6 months, 8 days
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Flowhood build: Comments/Criticism please
#25251307 - 06/06/18 03:34 AM (5 years, 8 months ago) |
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I'm redoing this whole post, please ignore.
I need to reduce my loss to contamination, hence this post. I would appreciate feedback. Current design, trying to be reasonably movable:

Not pictured are interior beading and framing for support and sealing. Blower dimensions aren't exact, but on the conservative side.
Prefilter
- Washable wire support pleated panel filter
- G4
- 595 mm x 295 mm x 48 mm
- 60 - 80 Pa
Filter
- Laminar HEPA Filter
- H13
- 610 mm x 305 mm x 8 mm
- 90 Pa
Blower Fan
- 350 W Forward Curved Centrifugal fan
- Expected air flow on Low @ 150 Pa: 360 l/s = 1224 m3/h -> 1.8 m/s WRONG!
- High will maintain similar air flow at 400 Pa (expected max of HEPA filter is 250 Pa)
- Approx. 90 dB noise

Chassis to be made from 16 mm plywood. Frame, beading and supporting structures TBD. To be finished with white PVA. Sealing with silicone. I've tried to restrict the design so that I only use a single 2440x1220x16 plywood sheet. 18 mm is currently on special and going for cheap, so I may adjust for that.
Primary filter will be removable, mostly held in place my negative pressure from the blower.
Power supplied via C13/C14 coupler. Lighting via an LED strip above main work chamber.
The plenum for main filter is a little on the large side. I may reduce it slightly to increase the size of the working area.
1.5 Lp(A) @ 1m/90ish dB is loud. I'm hoping having the fan entirely sealed will reduce its noise to something less irritating.
Estimated final weight: 40 kg
The only concern that I have is the blower. 350 W is a helova lot of heat dissipation to be contained inside a wooden box. The blower has thermal protection. It is listed as being usable within a cabinet, so I assume the design draws air from either side, including over the motor - to act as cooling.
Uses: All sterile work: Agar, LC, Grains, some PF. Grain jars are 165 mm in height. 305 mm should be enough vertical space in the work area to do G2G. Most of my work tops are 800 mm deep, with this thing on top, I should have enough working area.
When not in use, it will be covered, with something placed on top to protect the prefilter.
Am I making any obvious mistakes? Thanks in advance!
Edited by teladi (06/06/18 10:30 AM)
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teladi
FUNKSOULBROTHER


Registered: 06/27/17
Posts: 1,189
Loc: South Africa
Last seen: 6 months, 8 days
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Re: Flowhood build: Comments/Criticism please [Re: teladi]
#25251311 - 06/06/18 03:49 AM (5 years, 8 months ago) |
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Oh, cock. l/s is not the same as m3/h. Gonna fix that.
Expected air flow on Low @ 150 Pa: 360 l/s = 1224 m3/h -> 1.83 m/s
That's a bit high. God damnit teladi, you must be one of the few idiots who grew up with the metric system, and are still confused by it.
Required air flow: 300 m3/h - 350 m3/h = 0.0833 m3/s - 0.0972 m3/s = 83.3 l/s - 97.2 l/s @ 150 - 170 Pa.
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Edited by teladi (06/06/18 03:56 AM)
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merch137
Genetic Resevoir



Registered: 12/17/17
Posts: 1,072
Last seen: 5 years, 2 months
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Re: Flowhood build: Comments/Criticism please [Re: teladi]
#25251359 - 06/06/18 05:07 AM (5 years, 8 months ago) |
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I'm building a glovebox for painting and secondarily now mycology, its simple two gloves enter into a large 30 gallon sterlite tub flipped upside down and lid sealed on. It has two intake ports both are high flow hepa filters, and vents the air via duct out a window.
Really simple design that should do the trick for mycology, its original use is for airbrushing and using nasty vocs in the house like carbon fiber resin.
IDK the idea of a glovebox for painting seemed good, and then i looked at mycology thinking about it and it just seems like the ideal type of still air box or flowing air box.
-------------------- Those that know their mushrooms say...[...] Amanita. [quote]sublimistri said: id probably just trip it out then make them a friend and grow my own belladonna secretly to dose them on. [/quote] [quote]sublimistri said: this is the exact reason I wanna grow belladonna, because ima get that bitch back. [/quote]
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,890
Loc: Milky way
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Re: Flowhood build: Comments/Criticism please [Re: merch137]
#25251376 - 06/06/18 05:28 AM (5 years, 8 months ago) |
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Looks alright except the attached gloves and vent need to go
Hepa filtered air is absolutely useless if its turbulent. It will just take contamination off of surfaces that can only be sanitized and whip them around.
There's a reason we use a simple still air box. Because when you build the fancy one like that it doesn't work as well.
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merch137
Genetic Resevoir



Registered: 12/17/17
Posts: 1,072
Last seen: 5 years, 2 months
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Re: Flowhood build: Comments/Criticism please [Re: bodhisatta]
#25251404 - 06/06/18 05:49 AM (5 years, 8 months ago) |
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That is not my build, mine is 30 gallon and will have actual hepa vents on teh sides and vented straight out the window (its for painting vocs)
Please note it can be closed off and used as a sab if I had to, but knowing of the term flowhood I figured there may be some kind of positive to flowing the air like I would during painting.
Mine looks like a 4 inch duct coming out the top/back. Gloveports are 3d printed and on securely hepa ports are 3d printed and on securely. Front has polycarbonate window that is velcroed on.
Its currently alying around the house in parts as I have to patch the hood I used it for hydroponics.
Now that you mention it the attached gloves may not be best (but my ports are 3d printed so they can be exchanged), may just make a cardboard sab. reading attached gloves in context of contams dont sound good. in terms of dealing w/vocs it does. I'm not making a second one of these and my painting one will have attached gloves or ill make the 3d printed ports interchangeable.
I havent read enough on flowhoods to commment properly on yours, never needed a sab or flowhood.
-------------------- Those that know their mushrooms say...[...] Amanita. [quote]sublimistri said: id probably just trip it out then make them a friend and grow my own belladonna secretly to dose them on. [/quote] [quote]sublimistri said: this is the exact reason I wanna grow belladonna, because ima get that bitch back. [/quote]
Edited by merch137 (06/06/18 05:59 AM)
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,384
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Re: Flowhood build: Comments/Criticism please [Re: merch137]
#25251455 - 06/06/18 06:35 AM (5 years, 8 months ago) |
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Teladi that flowhood filter is only 12 inches tall (610 mm) that is not enough height for an enclosed flowhood IMO. You won't be able to easily do much, such as grain to grain transfers with bags or maybe even g2g jars will be a chore. That's some low headroom. Also that blower looks friggin' huge compared to the filter size but I didn't look at the specs. The overall design is really good though if you are good with the size.
Edited by sandman420 (06/06/18 06:50 AM)
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teladi
FUNKSOULBROTHER


Registered: 06/27/17
Posts: 1,189
Loc: South Africa
Last seen: 6 months, 8 days
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Re: Flowhood build: Comments/Criticism please [Re: sandman420]
#25251821 - 06/06/18 10:27 AM (5 years, 8 months ago) |
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Yeh, it is a bit tight for G2G, but doable. I'll consider the 610 mm x 475 mm filter (18 inch height).
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thegiantwithin
Stranger

Registered: 05/16/18
Posts: 78
Last seen: 4 years, 6 months
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Re: Flowhood build: Comments/Criticism please *DELETED* [Re: teladi]
#25251999 - 06/06/18 11:58 AM (5 years, 8 months ago) |
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Post deleted by thegiantwithin
Reason for deletion: Because
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inski
Cortinariologist



Registered: 02/28/06
Posts: 5,746
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Re: Flowhood build: Comments/Criticism please [Re: thegiantwithin]
#25252082 - 06/06/18 01:02 PM (5 years, 8 months ago) |
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Make sure you get an H14 filter, H13 is not good enough.
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teladi
FUNKSOULBROTHER


Registered: 06/27/17
Posts: 1,189
Loc: South Africa
Last seen: 6 months, 8 days
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Re: Flowhood build: Comments/Criticism please [Re: inski]
#25252143 - 06/06/18 01:35 PM (5 years, 8 months ago) |
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Quote:
inski said: Make sure you get an H14 filter, H13 is not good enough.
I've seen conflicting information on this, but I'll take a TC's word for it. This H13 filter was suggested as for being use in a flow hood, but I'll jump up to the H14. Cheers!
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teladi
FUNKSOULBROTHER


Registered: 06/27/17
Posts: 1,189
Loc: South Africa
Last seen: 6 months, 8 days
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Re: Flowhood build: Comments/Criticism please [Re: thegiantwithin]
#25252145 - 06/06/18 01:36 PM (5 years, 8 months ago) |
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Quote:
thegiantwithin said: If the hood is just going to sit somewhere permanently think about building it into the cabinet it sits on. I'm currently building this into mine.
I put the blower and 2'x2'x1' HEPA filter in it's own box in the cabinet under the countertop so they're out of the way. Then along the back edge of the counter & hood I cut a 4' wide by 3" deep slot cut through to below. Ducting underneath brings in air from outside, through the blower, and connects via ducting to the slot in the counter. The filtered air comes up through that slot, but behind a 4" deep 'mesh' that's made of 1/4" squares tubes which gets the flow back to laminar again.
This way it doesn't necessarily matter what sized filter you have as you can make the opening in the counter more or less whatever width you need. The mesh along the back will re-laminate the air flow as it comes back out. This leaves you with way more counter space for a full height, width, and depth flow hood to work in.
I can't have anything too permanent yet, but I'm going to think about this idea. Thanks!
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teladi
FUNKSOULBROTHER


Registered: 06/27/17
Posts: 1,189
Loc: South Africa
Last seen: 6 months, 8 days
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Re: Flowhood build: Comments/Criticism please [Re: teladi]
#25254398 - 06/07/18 02:47 PM (5 years, 8 months ago) |
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Quote:
inski said: Make sure you get an H14 filter, H13 is not good enough.
The H14 filters I can source locally - at least after a day of looking - are much larger and the price jump is huge. I'm going to go with the H13, but simplify my design to reduce costs. Since I will be using this in a smallish room, I'm confident that re-circulation of air inside it will reduce chances of contamination.

Going with first option. Fan to deliver 0.448 m/s.
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Edited by teladi (06/08/18 12:47 AM)
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