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RatThing
Nuclear Dog



Registered: 09/06/17
Posts: 90
Loc: USA
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RatThing’s Over-Designed Laminar Flow Cabinet
#26863581 - 08/04/20 10:53 PM (3 years, 6 months ago) |
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RatThing’s Over-Designed Laminar Flow Cabinet
This design is intended to make it possible for total amateurs (like myself) to build a flowhood. I love the craftsmanship of great woodworking the same way I love the craftsmanship in a great Kung Fu movie. I have never studied Kung Fu. And I have never studied woodworking. So I am aiming for exactly the level of remedial craftsmanship that I believe I can manage without cutting off any fingers. I can use CAD. I don't own a table saw, but I can use a circular saw and clamps to make straight cuts in boards. I can use my electric drill to drill holes and screw in screws. And I can wire up electrical things. So in my typical style of massively over engineering everything before I start in the hope that I know what I am doing, I have taken the basic concept from Bod's Easy AF Laminar Flow Cabinet Build and then carefully modeled it up using CAD. I am pretty sure this is something I can actually build, and I’d like to think this design might also be helpful to others. In short, this is Bod's Easy AF Laminar Flow Cabinet carefully fleshed out with a detailed design and parts list.
The basic idea is to build one box to hold the big HEPA filter, and then join it with a smaller box to hold the blower and the prefilter. I am using 1x2” boards on the interior seams to provide strength, an air seal, and provide supports for screwing in the box sides. Using the 1x2” boards also allows me to build the flowhood any needing specialized woodworking tools or skills (such as cutting dovetails or similar fancy joinery).
Here is my design:
  
  
  
  
What I Used:
- FreeCad
- Dayton 1TDT8 Blower.
◦ Purchased “open box” from Amazon for $156 about two years ago. I’ve been busy. ◦ I designed the blower box to such that it should accommodate either the Dayton 1TDT8 blower or the Dayton 1TDT2 blower, as either once should work.
- Flanders Filters Pureform Alpha Cell High Capacity HEPA Pureform "nuclear grade" Filter.
◦ Model T-007-W43-05-IU-51-23-Z06306, 24in x 24in x 11.5in ◦ Stainless steel frame, front grill, and back grill. Somewhat heavy. ◦ Old stock, New, Unused, Unopened, Undamaged in original packaging. ◦ Purchased from ebay for $85 / $135 shipped. ◦ And yes I also bought this thing about two years ago. And yes, I really have been terribly busy. It will soon be put to its intended use.
- Wall Supports
◦ Made using 6 pieces of 1 in. x 2 in. x 8 foot boards.
- Walls (0.75" plywood)
◦ I require 2 sheets of plywood. One sized 8ft x 4ft. A second sized 4ft x 4ft. ◦ I bought a piece of 0.75” plywood, sized 8ft x 4ft, for about $50. ◦ I could have spent about $26 to buy the needed 4ft x 4ft plywood. Instead, I picked up part of a bed from a local thrift store (about $10?). The plywood, which was perfect and cheaper than new.
- Prefilter Air Filter (12"x20"x1")
- Dual gang electric socket, with a light switch and an electric socket.
- A panel mount IEC C14 AC Electrical power connector salvaged from some old computer parts I had in my basement. I have plenty of standard AC power cords, and this should work nicely.
- Two very heavy duty handles. Might need 4. Might decide to switch to using some wood pieces for handles. Or leave the handles off. Not yet sure.
Parts and Dimensions:
- HepaBox Walls
▪ 25.5”x24” HepaBox RightSize (0.75" plywood) ▪ 25.5”x24” HepaBox LeftSide (0.75" plywood) ▪ 25.5”x25.5” HepaBox Back (0.75" plywood) ▪ 24”x24” HepaBox Top (0.75" plywood) • 8 1/8” x 4 1/8” Fan Air Inlet cutout ▪ 24”x24” HepaBox Bottom (0.75" plywood)
- HepaBox Wall Supports – Requires 3 pieces of 1 in. x 2 in. x 8 ft boards
▪ 21 1/8” HepaBox FrontFrameRightSide Support (1"x2") ▪ 21 1/8” HepaBox FrontFrameLeftSide Support (1"x2") ▪ 21 1/8” HepaBox BackFrameRightSide Support (1"x2") ▪ 21 1/8” HepaBox BackFrameLeftSide Support (1"x2") ▪ 11 1/8” HepaBox LeftFrameTop Support (1"x2") ▪ 11 1/8” HepaBox LeftFrameBottom Support (1"x2") ▪ 11 1/8” HepaBox RightFrameBottom Support (1"x2") ▪ 11 1/8” HepaBox RightFrameTop Support (1"x2") ▪ 24” HepaBox FrontFrameBottom Support (1"x2") ▪ 24” HepaBox FrontFrameTop Support (1"x2") ▪ 24” HepaBox BackFrameBottom Support (1"x2") ▪ 24” HepaBox BackFrameTop Support (1"x2")
- Blower Box Walls
▪ 13”x13 1/8” Blower Box RightSide (0.75" plywood) ▪ 13”x13 1/8” Blower Box LeftSide (0.75" plywood) ▪ 24”x13” Blower Box Front (0.75" plywood) ▪ 25.5”x13” Blower Box Back With Air Inlet Hole (0.75" plywood) • 18”x10” Back Air Inlet cutout has 1 inch all around to support the prefilter. ▪ 25.5”x14” Blower Box Lid (0.75" plywood)
- Blower Box Wall Supports (1"x2") – Requires 3 pieces of 1 in. x 2 in. x 8 ft boards
▪ 10” Blower Box FrontFrameRightSide Support (1"x2") ▪ 10” Blower Box FrontFrameLeftSide Support (1"x2") ▪ 10” Blower Box BackFrameRightSide Support (1"x2") ▪ 10” Blower Box BackFrameLeftSide Support (1"x2") ▪ 10” Blower Box LeftFrameBottom Support (1"x2") ▪ 10” Blower Box LeftFrameTop Support (1"x2") ▪ 10” Blower Box RightFrameBottom Support (1"x2") ▪ 10” Blower Box RightFrameTop Support (1"x2") ▪ 10” Blower BoxTopRight (1"x2") ▪ 10” Blower BoxTopLeft (1"x2") ▪ 13” Blower Box BackLeftSide AirFilter Support (1"x2") ▪ 13” Blower Box BackRightSide AirFilter Support (1"x2") ▪ 24” Blower Box FrontFrameBottom Support (1"x2") ▪ 24” Blower Box FrontFrameTop Support (1"x2") ▪ 24” Blower Box BackFrameBottom Support (1"x2") ▪ 24” Blower Box BackFrameTop Support (1"x2")
I am attaching my CAD model in the hope it will prove helpful to others wishing to build something similar. I am about to begin actually building my flowhood using this design, so if anyone sees something I messed up or designed poorly, I'd be grateful for your feedback.
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Edited by RatThing (10/07/20 01:25 PM)
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RatThing
Nuclear Dog



Registered: 09/06/17
Posts: 90
Loc: USA
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Edited by RatThing (10/30/21 09:22 PM)
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cekoxa
Fpv pilot


Registered: 07/03/14
Posts: 145
Last seen: 2 months, 24 days
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Re: RatThing’s Over-Designed Laminar Flow Cabinet [Re: RatThing]
#27458295 - 09/06/21 01:34 PM (2 years, 5 months ago) |
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thanks for the effort. good job
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RatThing
Nuclear Dog



Registered: 09/06/17
Posts: 90
Loc: USA
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Re: RatThing’s Over-Designed Laminar Flow Cabinet [Re: cekoxa]
#27524543 - 10/30/21 07:23 PM (2 years, 3 months ago) |
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Thx! I should upload pics of my (actually built) flowhood... [---uploading pics from a while ago---] Done.
It came together just as planned and works perfectly. The design is perfect. I have had exactly zero contamination since using it. I love having the switch and the power socket up front. It would be beautiful as well as functional, but I chose to use cheap plywood from the local thrift store. So it probably won't win any beauty contests, but it does just what it is supposed to do.
Edited by RatThing (10/30/21 08:39 PM)
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m0n0id


Registered: 10/08/21
Posts: 88
Last seen: 2 months, 6 days
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Re: RatThing’s Over-Designed Laminar Flow Cabinet [Re: RatThing]
#27524610 - 10/30/21 08:34 PM (2 years, 3 months ago) |
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Quote:
RatThing said: RatThing’s Over-Designed Laminar Flow Cabinet I love the craftsmanship of great woodworking the same way I love the craftsmanship in a great Kung Fu movie. I have never studied Kung Fu. And I have never studied woodworking.
Laughing my ass off. Well done!
One feature you (and others) might want to add is a panel to cover the filter's exhaust side when not in use, that way dust can't settle on it when in storage (to be blown out later when you're setting up your work environment).
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RatThing
Nuclear Dog



Registered: 09/06/17
Posts: 90
Loc: USA
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Re: RatThing’s Over-Designed Laminar Flow Cabinet [Re: m0n0id]
#27524631 - 10/30/21 08:50 PM (2 years, 3 months ago) |
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Quote:
m0n0id said: Laughing my ass off. Well done!
One feature you (and others) might want to add is a panel to cover the filter's exhaust side when not in use, that way dust can't settle on it when in storage (to be blown out later when you're setting up your work environment).
Thx! The location (in the corner of my basement "mush room") fortunately has very little dust or airflow. And the flowhood never moves from its fixed location, even when not in use. But I'll absolutely grant that a dust cover would be a fine addition. Great idea.
Edited by RatThing (10/30/21 09:00 PM)
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anatomality
Nothern Counterpart



Registered: 05/31/20
Posts: 1,354
Loc: North East
Last seen: 12 days, 2 hours
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Re: RatThing’s Over-Designed Laminar Flow Cabinet [Re: RatThing]
#27524647 - 10/30/21 09:14 PM (2 years, 3 months ago) |
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Everyone got nice things. I need a bigger place...
Beautiful work my man.
-------------------- “The strength of a person's spirit would then be measured by how much 'truth' he could tolerate, or more precisely, to what extent he needs to have it diluted, disguised, sweetened, muted, falsified.”
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