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simonjester44
Old AF



Registered: 03/22/13
Posts: 94
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Last seen: 1 year, 2 months
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24 x 24 Flowhood Design 1
#18293945 - 05/20/13 05:50 PM (11 years, 1 day ago) |
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I have salvaged a 1/3 HP Blower (BRAND NEW) from local HVAC guy ($50.00) and have a 24 X 24 X 6 99.99% that will be delivered tomorrow. I'll use a 20 x 16 x 1 95% prefilter attached to the blower housing.
I think I need the following cuts:
1@ 12" x 21.5" 1@ 25.5" x 25.5" 1@ 16.75" x 21.5" 2@ 30" x 24" 2@ 25.5" x 30" 2@ 12" x 16"


(the drawings should be to scale)
Question:
Can I expect that if I make a 24 x 24 space that it will fit well, or do I need to plan on an additional 16th all around to slide in the filter?
If I can get the correct flow on Medium Speed, can I run the unit on High just to clean the room, or will that damage the filter?
Take a look, it would be great if the community found some mistakes before I paid Blows to make the cuts on 100 bucks worth of PlyWood.
-------------------- "Never underestimate the power of friction as a construction adhesive."
Edited by simonjester44 (05/29/13 03:21 PM)
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Registered: 08/05/12
Posts: 1,108
Loc: FL
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18301020 - 05/21/13 09:46 PM (11 years, 29 minutes ago) |
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Hi,
Nice planning and graph... you look like you're on the right track.
For a flowhood that big, I'd use more expensive wood (like birch), which may exceed more than $100.
You definitely need to have a permanent place to set it down haha... that's a big guy.
Also, can you post a link and picture to the blower that you have? I'm curious about the specs... try to get a close up on the specs sticker on it and the wiring sticker (with the speeds, etc)
To answer your question, yes, you need to make room for the filter to slide in... but it needs to fit PERFECTLY.
your side panels should be 25 1/2 inches tall... so yeah I think you know what you're doing
Once you build the box, attach the blower, vacuum/clean it out, the last step is to literally slide in your filter (you may need a helping hand).
So keep the screws around the front loose, slide it in, then tighten them once the filter is perfectly in place.
Also, fitting a blower box on top is optional, and although it looks really good and is the easiest way to always have a perfectly snug pre-filter, it will make your flowhood even heavier...
Looks awesome though dude!!! 
Cheers from FL
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cubenpete
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: Mykes logos]
#18302378 - 05/22/13 05:39 AM (10 years, 11 months ago) |
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simonjester44
Old AF



Registered: 03/22/13
Posts: 94
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Last seen: 1 year, 2 months
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: Mykes logos]
#18303111 - 05/22/13 10:37 AM (10 years, 11 months ago) |
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Thanks for the input! Here are the pics you requested:
Filter:

Blower its supposedly salvaged out of a damaged and never used HVAC unit. It is super clean; ou can see my fingerprints are really the most "dirty" thing. The owner of the HVAC company said he didnt have the specs as it was integrated into the HVAC system from the manufacturer, but he said it should do 600cfm at 1" on Hi speed.:



-------------------- "Never underestimate the power of friction as a construction adhesive."
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fastfred
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18303829 - 05/22/13 01:11 PM (10 years, 11 months ago) |
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Good grab on the blower. I've been telling people to do this for years. I've gotten quite a few free blowers this way.
Looks like you're trying to put the pre-filter before the blower. I would not do it this way. You might need to regulate the speed a little bit more than the 3 wires give you. Blocking off the intake more or less is an easy way to do this.
I highly suggest making a good prefilter and putting polyfil in the plenum. On my units this seems to catch a lot of dirt and will make the HEPAs last a lot longer.
I've never bothered with laminar designs since I like nice big hoods to work in, but you can find a lot of info on this site. It's been discussed to death plenty of times.
-FF
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homo nosce te ipsum


Registered: 08/05/12
Posts: 1,108
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: fastfred]
#18306769 - 05/22/13 10:30 PM (10 years, 11 months ago) |
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Oh good points fastfred!
OP: assuming everything goes as planned, your final steps should be minor adjustments to the prefilter(s) to get that perfect laminar flow
here are some links to teks that you may be interested in too: Stonesun's Damion’s mushroompatch Evilmushroom's Misters
good luck! update with results!!!
cheers from FL
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simonjester44
Old AF



Registered: 03/22/13
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: fastfred]
#18332114 - 05/28/13 06:17 AM (10 years, 11 months ago) |
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Thanks for the tips and links guys.
I think I'll start without the blower hood. I can always add it later. I have plenty of polyfill so I'll give it a try.
More to come!
-------------------- "Never underestimate the power of friction as a construction adhesive."
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simonjester44
Old AF



Registered: 03/22/13
Posts: 94
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Last seen: 1 year, 2 months
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18332414 - 05/28/13 08:51 AM (10 years, 11 months ago) |
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Here are the board cuts. It turns out that there was no way to get only the bottom part of the flowhood cut without using two boards, so I got the rest of the cuts done too.
These cuts are only ROUGHLY to scale 
I will be adding one additional 25.5" x 25.5" cut to use to cover the HEPA, and it is included in drawing.
EDIT: Original drawing was wrong and did not include one of the 24" x 30" cuts. That was a $50 error.
Edited by simonjester44 (05/29/13 08:38 AM)
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Mykes logos
homo nosce te ipsum


Registered: 08/05/12
Posts: 1,108
Loc: FL
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18334667 - 05/28/13 06:15 PM (10 years, 11 months ago) |
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there's nothin wrong with extra wood
Looking forward to seeing this... are you planning on painting it and/or adding a nice trim? Do you have a lab desk to put it on, etc?

cheers from SWFL
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simonjester44
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: Mykes logos]
#18334747 - 05/28/13 06:30 PM (10 years, 11 months ago) |
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I just applied for a job in Key West.....
I dont think I'll paint it, but I'm likely to stain it. The wood is red oak, so I bet it will look good. I have some brass screws and a counter sink bit (I think I saw that in stonesun's tek) However, I do not think I will go as far as trimming it out like stonesun...That's a lot of work and purely aesthetic.
Wood will be ready in the AM.....
I dont have a desk per se, but we have a large glass table.
-------------------- "Never underestimate the power of friction as a construction adhesive."
Edited by simonjester44 (05/29/13 07:34 AM)
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simonjester44
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Registered: 03/22/13
Posts: 94
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18338810 - 05/29/13 03:02 PM (10 years, 11 months ago) |
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I was able to get the cuts done for free at the local HomeDespot. They were free but some cuts were off by as much as 5/16. This made for some poorly fitting joints. Some of the close ups are to show this.
I also ended up with another prefilter and a dish towel over both prefilter to get the things to settle down on medium. So thats a towel + 2 inches of 95% HEPA as the prefilter.
Thanks for looking at this thread and let me know if you have any questions.
Time for a beer!
Edited by simonjester44 (05/29/13 03:34 PM)
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mycoelf
Agent Of Chaos



Registered: 06/26/09
Posts: 555
Loc: hyperspace
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18340453 - 05/29/13 08:39 PM (10 years, 11 months ago) |
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Quote:
simonjester44 said:

Time for a beer!
This pic says it all, Nice job Jester, Id advise to get a coat of finish on that so you do not accidentally have some sort of mold move in and make a home in the wood of the flow hood, cut off the potential nutritive source so to speak.
-------------------- Mycoelf Sterility is a process that can be likened unto infinity, which is a long walk, the closer to the end you start before beginning, the more achievable the goal of infinity becomes. Remember, cleanliness in next to goddessness
      
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mycoelf
Agent Of Chaos



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Loc: hyperspace
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: mycoelf]
#18340473 - 05/29/13 08:42 PM (10 years, 11 months ago) |
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Oh yes, you should run your hood a minimum of 1/2 hour before session, that cage does some serious air, more like 1000-1500 CFM, you wont hurt your filter running it higher pressure, but you will create turbulence that is less then ideal, run it like the pic I quoted and that will be perfect
-------------------- Mycoelf Sterility is a process that can be likened unto infinity, which is a long walk, the closer to the end you start before beginning, the more achievable the goal of infinity becomes. Remember, cleanliness in next to goddessness
      
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Registered: 08/05/12
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: mycoelf]
#18345545 - 05/30/13 07:40 PM (10 years, 11 months ago) |
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Quote:
mycoelf said: Oh yes, you should run your hood a minimum of 1/2 hour before session, that cage does some serious air, more like 1000-1500 CFM, you wont hurt your filter running it higher pressure, but you will create turbulence that is less then ideal, run it like the pic I quoted and that will be perfect 

That is one sexy beast right there!!! Nice job!
cheers from SWFL
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TheCyndicate
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: Mykes logos]
#18354769 - 06/01/13 06:33 PM (10 years, 11 months ago) |
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Cyn
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simonjester44
Old AF



Registered: 03/22/13
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: TheCyndicate]
#18382440 - 06/07/13 10:23 AM (10 years, 11 months ago) |
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Just one last update.
I poured this (and about 30 others) plate in front of the new hood.
Once it was cool and set, I opened the lid and left it there for 10 minutes.
This is a front and back picture of the plate after one week.
So I'm fairly happy.
  

-------------------- "Never underestimate the power of friction as a construction adhesive."
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mycoelf
Agent Of Chaos



Registered: 06/26/09
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18383450 - 06/07/13 02:35 PM (10 years, 11 months ago) |
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-------------------- Mycoelf Sterility is a process that can be likened unto infinity, which is a long walk, the closer to the end you start before beginning, the more achievable the goal of infinity becomes. Remember, cleanliness in next to goddessness
      
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ely2121
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: mycoelf]
#18393528 - 06/09/13 06:17 PM (10 years, 11 months ago) |
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Do you have final numbers on the estimated cost of this build?
Well done job, and one I will be shamelessly copying in the near future 
How much you think it weighs in the end? Three cheers to you mate
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simonjester44
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: ely2121]
#18397280 - 06/10/13 01:06 PM (10 years, 11 months ago) |
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Here are the approximate costs:
Filter: $140.00 Blower: $50.00 Wood: $105.00 Hardware: $10.00 Caulking: $7.00
It weighs about 75-90 pounds. (I'm guessing really) It is not too heavy that I could not pick it up by myself if only it were not so bulky. Not possible to move by myself for that reason.
We found a place to put it so that I only have to rotate it to use it.
Thanks for everyone's kind words, and be sure to check out the other builds linked up in this thread for more ideas.
Standing on the shoulders of those before us!
-------------------- "Never underestimate the power of friction as a construction adhesive."
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Spawny
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: simonjester44]
#18429860 - 06/16/13 09:29 PM (10 years, 10 months ago) |
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Damn nice job! I had plans to make a 24x24" filter but didn't realize how big the thing would end up being. I have the filter still too!
-------------------- Trolls are trolly.
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svenoldb
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Re: Critique My 24x24 Flowhood Design Before I Build [Re: Spawny]
#18465499 - 06/24/13 02:02 PM (10 years, 10 months ago) |
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Yeah nice job, congrat and have fun
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