Building another air cleaner

[@onjit]

Why have I been watching your videos for over a year I don't even do any woodworking or anything.

[@metamech7383]

Is it because Matthias looks so much like Rick Moranis?

[@TheDirtFighter]

DUDE!!! you are so right!!!...Strange Brew ehh, there's a mouse in my beer hoser

[@st_us]

I just love the small tips he mentions every now and then. I also never did wood working in my life

[@mikeabe]

Because Matthias is a genius

[@CSSIandAssociate]

Onjit dude you are so funny. However, our KZbin friend Mathias "Is Worth Watching" enjoy....

[@metamech7383]

Matthias, my wife hates you for giving me the idea to salvage things, but now I have so many cool motors, capacitors, transformers...I'm up to my 6th microwave find. Thanks to your motor explanations I've figured out how to reverse engineer motors. Think I'll use an old dishwasher motor and make me an air purifier like yours.

[@JosephLorentzen]

How did it turn out?

[@superjojo555]

his wife left him

[@Absfor30]

@@superjojo555 I just laughed soo hard at this comment I spilt my drink!

[@sjem618]

Hi Matthias, firstly I wanted to say that I think your projects are great! Concerning the efficiency of your fan, I do not know much about air fans. But I am a mariner on a tugboat so I know something about propellors. Normal cargoships have a propellor similar to your fan and are designed for maximal efficiency with minimal fuel consumption. However, I work on a tug, which means the propellors have to provide maximum pulling power. For obtaining this a nozzle is fitted around the propeller which enhances waterflow for more pulling power. I think that if you experiment with a nozzle fitted tight around your fan, you might get more suction. Maybe you have to sand off the ends of the propellor blades to make it fit more tight in the nozzle. I think they call it a ducted fan. Looks like it is a nice project to do on the wood lathe. ;)

[@ProdigalPorcupine]

Just a word of warning. If this is a typical cheap fan domestic motor, the bearings are often seriously prone to gumming up and seizing. I've kept my fans running by maintaining them when the speed starts to drop or they spin down too quickly when switched off, but it's a pain as they have to be dismantled, then the shaft and bearings cleaned and relubed. I can see wood dust causing problems very quickly, especially as it will be quite happy to stick to the oily bearings. Anyway, nice project as always, keep a close eye on the fan motor, though!

[@___echo___]

I don't know if that would be an issue in this case though, considering the air blowing past the motor will have just gone through the filter

[@lauravitoria2537]

Good afternoon! I know you're a busy man, but I want to share with you my happiness to be learning how to work with wood and you're part of this learning, thank you! The Google translation is not good, sometimes the texts do not make sense, for example I can not know what kind of wood you use, but overall has been very good. Once again, thank you!

[@kafeltz]

I learnt a lot when I took off the grid from my fan. The air wasn't far enough and I learnt that the grid and rings did this job. I really love to learn things that some engineer already knew before you.

[@droko9]

We just gonna ignore that perfect circle he cut?

[@piercenewby2406]

holy crap, i just watched that part haha

[@edgarquintana8200]

Best coment ever jajajaj

[@PT1040]

Wow, I chuckled at the rubber mounts at the end of the vid. Just a reminder of how much you really think about your ideas. Very cool! Makes me want to build one of these even though I don't have a shop yet!

[@JackMW1992]

I use box fans with filters in my apartment to keep the dust down since I don't have central air. I made cardboard baffles in all the corners to encase the fan in effectively a tight fitting tube of cardboard which now moves air through the filter much more efficiently.

[@monkeyvideo1029]

Matthias- I love your ingenuity and DIY approach to things. I wanted to pass on some info about your dust cleaners that many woodworkers are not aware of. My father was an engineer and woodworker and did a lot of research on the matter after a friend contracted a lung disease from dust particles. First the motor used is a fire hazard. As another viewer wrote the dust getting through or around the filter will collect on the oily 'open motor'. This is why furnaces and commercial dust boxes use a squirrel cage style motor, where the air does not pass over the motor (I actually use an old furnace motor in my shop dust collector). Second and equally important is the false sense of security that if you don't see dust I don't need a mask. Unfortunately, the big dust our body can filter out it is the fine dust we can't see that gets into our lungs and causes problems. So please use a squirrel cage motor design and a mask! BTW - there is a site by Bill Pentz taking about shop dust and has a lot of filtration information.

[@mogbaba]

You are not only very talented but have a nice sense of humor as well.

[@freesaxon]

love the simplicity of the anti vibration mount

[@krishnasheela]

I am a mathematician,I get attracted towards all your videos for you use precision in all your works to bring out beautiful objects!

[@tjfSIM]

There is something very satisfying about this video, how all the pieces slot together so neatly. You are a master craftsman Matthias!

[@Femmpaws]

Matthias nice work I have done the box fan thing as well. What I found is if you pit a ring around the fan blades about 30 to 40 mm deep and clear the tips by about 5 mm you should stop the losses. The other trick is to put the ring past the fan tips by 10 to 15 mm so the fan is blowing through the ring so it acts like a venturi. You would need to round the corners for better air flow. This is the trick I used on box fans to clean the fiberglass dust out of the air from grinding.

[@Odood19]

I duct-taped the grill of my box fan to round the corners on the front, and pressure holds the filter to the back. It's a great way to de-must a room

[@frollard]

Your air filters inspired me to design one for our makerspace 3d printer room; using a squirrel cage bathroom fan for static pressure, it holds 2x 20x25x5 filters giving not a tonne of airflow but enough to positively pressure the room with clean air. With the door on a closer the workshop dust will stay on the dirty side and the printing room can stay clean.

[@txkflier]

Another great video, of course. Hanging it using pieces of inner tube was pure genius..

[@9nine917]

Wack on the motor to align bearing, was a priceless tip! Thanks a lot for this. Also, if I may suggest, you could gather all of those useful tips and put in one video. Similar to what Jimmy Diresta did... I personally referred back to his videos quite a few times, which made my life easier in many occasions.

[@dogface6040]

I've tried this, and there are some limitations to the concept. (I'm a mechanical engineer in the AC field) My first hesitation is the purpose of the setup: health or dust spotting of the work. Health: you really want to get rid of particles in the 1--10 micron range, and a "furnace filter" won't touch that stuff. I know MW used a dust sensor, but those generally don't measure this size particle. If you used a better filter, that little prop fan won't push any air through it anyway. Actually, in the particle size mostly noticed, the air clears by itself because these particles react to gravity. They seem to "gravitate" to my freshly finished surfaces! The other problem is that the fan isn't designed to "pull" large amounts of friction, similar to what a filter (even a light grade furnace filter) produces. Simply put, the fan won't produce. My model was a 20" box fan (easier fit to the 20/20 filter). I got a little air out of it, but not enough to do any good. Commercial dust collectors have fans that will produce air flow through filter friction. These units will produce enough air changes in the space to be effective. However, their filters may not be effective on low-micron dust sizes. You really have to know filter technology to understand the relative effectiveness. If I wanted air filtration for health reasons, I'd look for "merv 15" rating or higher. What do I do, oh expert that I purport?! I have a fan in the middle of the garage that points to the garage door. I open the door (and the side door), run the fan for 15--20 minutes and that "blows out" the space. I also use a central (portable) dust collector with a bag "rated" at 1 micron.

[@JEKMills]

Yeah I was thinking along the same lines. Particularly when MW said 2 fans should clear the room twice as fast. I'd be amazed if that was true, since most of the air clearance will be due to the dust settling due to gravity. I'd expect the second fan to have very little impact. Also as you say the fan will pull almost no air through the filter as soon as it starts to clog. A better solution would be to push the dusty air outside.

[@lunardust201]

an axial fan is not going to have enough pressure to filter anything either!

[@dogface6040]

Every fan produces SOME air! Small prop fans ("axial" includes some in line designs used in clean rooms and high pressure) have blades and tip speeds intended to produce high volume at low pressure. They're great for ceilings and room air movement. They die quick if they have any pressure. They also do poorly when constrained (like duct, filter case) because the blade design is meant to throw air at an angle off the blade, not just straight forward. So, dimensional constraint (like a duct) lowers their effectiveness, and then pressure (filter) knocks it further. I got some air, but barely. What can work is to blow air from a relatively clean area of the room across the work area, which pushes particles away from the work; no filter. You have to blow into a large enough area from the work to let the particles settle out. This explains why the "dead zone" in my shop room is knee deep in dust. As long as the work area is clear, I'm ok.

[@ivanilarionov1893]

That's totally true! I built myself air cleaner from a centrifugal fan with capacity 600 cubic meters per hour, and 2 filters 29x29 cm - one for coarse filtration and the second is class F8, which corresponds to merv 14. Anything below that just generates noise...

[@tmkrick]

That sounds like good advice but I've blown a vornado fan (somewhat underpowered) through a crappy filter (300mpr) and it still ends up removing the small (< 1 micrometer) particles according to my dylos meter. Seems to work.

[@arandafotografia]

Another one?. You have the cleanest shop in the world!. Greetings from Spain.

[@troyna77]

I like that handle idea as well as the rest of your filter fan.

[@itsgeegra]

Almost no knowledge of woodworking but your videos are radical and I'm learning a whole lot! Keep up the good work!

[@OneManBandWoodworks]

New plywood today, pocket screws tomorrow...

[@slendy9600]

LOL

[@markm0000]

Nah I still believe that was reclaimed plywood from something that was fairly new.

[@larsmark]

I don't know why, but the first time I saw pocket holes being used I was a bit disgusted. Its just a really boring way of jointing stuff together. So I guess I am an anti pocket hole guy...

[@grayem76]

it is ok to have a chaos corner matthias you're still 90% cleaner than me and my shed i think i have more spiders than materials but im a metal worker still love to watch your videos

[@rdouthwaite]

My designated chaos area IS my shop! ;-)

[@عليكريم-ل1خ4و]

+Lavre لحه

[@chriss2031]

Just incooperate the spiders into your projects. :P

[@ismaelvarela7638]

Im not a wood or metal worker but i enjoy these videos

[@loadzofhobbies4219]

is he at yours?

[@mattpaff7819]

I don't know why but I really enjoy watching you make these air filters!!!

[@rolandvos]

A dedicated chaos area is a must have... I have several I cherish. Thanks for the nice video.

[@SavvasPapasavva]

Lol chaos area. I'm making a pleated air filter at the moment, and happen to put the baffle in line with the fan. Should hopefully have the video up at the end of the month.

[@pixelkatten]

Don't be embarrassed about having a chaos area, Matthias! It's the neat freaks you have to look out for...

[@dpmakestuff]

Nice build! I think my favorite part was the mounting solution. First time using that?

[@SHcinema]

Yeah, loved the mount!The most efficient way to have done this airflow wise would have been to make a duct for the fan that attached to the back of the baffle which would be on the face of the box. This wouldn't allow any reverse flow at all can can be done to a standard box fan as well.

[@howardwhite9773]

Chaos area? I think that defines most of the work spaces for the rest of us...

[@nickguy6820]

Yep. His chaos area looks like my "designated clean spot".

[@andrewkrohn9846]

The inner tube as vibration dampeners is awesome

[@CorvanEssen]

The air being pulled in from the side is probably just due to the speed of the air being blown away. The fast air has a lower pressure so the air around it wants to move in. Bernoulli stuff. Nice build :)

[@matthiaswandel]

Yes, like I said

[@CorvanEssen]

+Matthias Wandel sorry. I guess I missed that

[@BenjaminEsposti]

Congrats Matthias, you just built a "bladeless" fan. X'D

[@scorinth]

Nice beat at 1:59. Can't wait to hear that sampled and put into a track.

[@robin888official]

I know, right? How about a collaboration with Andrew Huang? %-)

[@MrTooTechnical]

Nice video. I was in your basement twice. And I saw the chaos area. Your right, it hasn't changed at all

[@kenwest7300]

I knew you weren't happy with the power on the last air cleaner! Thanks for the videos, they are great!

[@matthiaswandel]

Actually, the last one I built was much more powerful, but it was for my other shop.

[@NeonsStyleHD]

Same thing happens with prop planes. If you park the plane on gravel an start the engine, the prop will pick up gravel. This is something you shouldn't do because it damages the prop, and nicks in a prop can unbalance it, and the last thing you want if your prop flying apart when you're flying.

[@ismaelvarela7638]

I dont have any idea how you do your stuff but I can see you are a very dedicate man... some day ill hope to be like you.

[@CommodoreFluffy]

I love these videos, really interesting stuff about the flow direction. Maybe if you want to limit inefficiencies from the venturi effect you could install a diffuser on the outlet? Alternatively a long exit tube would decrease negative outlet flux, and could be easily fashioned from a bucket.

[@CSWilsonDraws]

I really like your ingenuity. And we all need a little "designated chaos area". :)

[@southsidedojo2]

That tells me you have a real shop. Not a studio. Keep up the awesome work!

[@firstreviewer8966]

Not only do these box fan filters work they work very well. I did not build the 4-sided fan filter, but I will now….Here is the proof they work in cleaning the air….A few months ago my wife told me that she was not breathing very well while sleeping. So, I started putting new filters in our duck system more often, but it didn't seem to help her. I then built a box fan filter with a 24-dollar hepa-filter attached. Then not only did my wife sleep better, but our cat, that we had been giving daily allergy medications to for the last 4 years, because it coughed and sneeze, has not sneeze or cough one time in 4 months since we started using these simple filters. Thank goodness no more cat medicine. Give these simple filters a try I think you will be glad you did. I attached my filter to the box fan by using painter’s tape. If you put the filter on the box fan where the air enters the fan you really do not have to use much tape the air stream keeps it in place. Best of luck! FR.

[@joeny1980]

Love the precision of your work. Fair to say that though this is a much more elegant build, a box fan with a baffle added to it could give you similar performance?

[@IncogSkbb021]

I like your idea of using a box fan. I'm going to do that plus what you did. I have a smaller oscilating fan that the motor broke and i will put that into a box fan that is 20" x 20" that I have, that the plastic fan blades are breaking off of. If I take the box and use it as my enclosure, all I will have to do is make a slot in the back to slide in and hold the filter in place. After that all that would need to be done would be to make a baffle for the front since we're using a smaller fan blade. Thanks for the ideas!

[@Pacwind31]

Matthias, you rocked it as usual. Brilliant.

[@1crazynordlander]

I haven't heard the term "interference fit" since tech school!

[@videblu]

I think it's a good idea to use a blower style design. They're much better for static pressure so that you don't have that backflow through the fan blades. I think that'd make your air cleaner more efficient!

[@matthiaswandel]

No, see previous replies

[@ejrupp9555]

how long did you use it before you noticed it really didn't do anything and you were better off just putting it in a window and blowing it out?

[@BradleyMakesThings]

Awesome, Matthias! Love how your videos are part woodworking, part diy and part science class. Great stuff!

[@dmmflys]

I always enjoy your videos thanks again. As for the flow of air at the tip of the blades that is caused by the low pressure created by the blade. The different pressure will naturally try and equalize the high pressure air will move around the tip of the blade. This may also explain your problem with air seeming to get interference from the filter. Some smart engineers figured out a couple ways to help slow the migration of air but on a existing fan blade I'm not sure how to apply those methods. One way is winglets - take look at newer commercial airliners. Thx again for a very cool video.

[@dmmflys]

New commercial airliners wing tips. That's what the weird bent looking thing at the tip of the wing does.

[@g81atherton]

Wow man, you really do make some elegant looking stuff. I'm gonna have to try this.

[@ujayet]

This is awesome!,, not just the fan making but the workshop... if i have a work shop like that, i would spend all my free time in it., time to play the lottery!

[@hanvyj2]

I'm halfway through making one of these after watching your last one a few months ago, really useful.

[@moninum]

How about making a shroud on the baffle? I´m always thinking about air flow on the CPU fan of my computer, it´s similar, the air is sucked in in the middle of the fan but on the outer part it flows backwards as it turns into rotation. Adding a short duct on the intake helped a lot.

[@michaelr5594]

You can actually combat the re-circulation issue by placing your baffles about 2-3 centimeters in front of your fan. It will cause the venturi that was mentioned in an earlier comment. Placing the fan far enough behind the baffles so that the cone of the fan would not fit the hole will actually cause more air flow.

[@YvanR0Y]

Instead of a thin baffle around the fan, you can try a short section of duct. For example, in situations like yours, I've backed the thin baffle with styrene foam insulation. 1 inch foam is all that is needed to start reducing the vortex of air that forms around the fan blade tips.

[@OwenTownend]

The effect you found with the string near the edge of the propeller blade is the tip vortex. To reduce it you could add a short tube or 'duct' around the prop. There's a nice explanation of the effect here: kzbin.info/www/bejne/eZbaZn18bdZpm7s Basically you have a lower pressure on the filter side of the propeller which is sucking the air back inside at the edge where there's no blade (or baffle) in the way.

[@steubens7]

scrap inner tubes are so handy.

[@Peteworth]

Yes!!

[@alaric_]

thumbs up for the chaos area :D

[@nc3826]

I had to double check if I was still on your channel Matthias. I see a lot of great projects you designed, but never anything that was this simply straight forward and effective before. Nice to know you can do simpler concept too without to much over-engineering. Nice job.... But with that being said I still would like to see a cyclone ie thein baffle version. Like by turning on its side and placing the inlet on its side with round inner wall with reversed the air flow. And few other modifications. But it wouldn't be that much more complex would it??? Ok its easier to think up this stuff then to make it work :) Keep up the good work. You inspire us. I wonder what next project you do, that will be commercialized like your world changing pantorouter?

[@BronkBuilt]

What about adding a filter to the front so if any air is pulled in it will go through a filter?

[@tenpennyguy]

Lots of clever ideas and work methods wrapped in this, besides being useful for itself. Time to upgrade my own box fan + taped-on filter!

[@LiL000JoE]

You are so talented and your videos are such a satisfying pleasure to watch. Thank you for uploading! :)

[@ClickerQuiz]

like number 5,300! I've seen photos of air cleaning rigs like this before on the internet, but this is the first instructional video for making one that I have come across. Thank you for making and posting this.

[@min2oly]

instead of or in addition to baffle.... why not build more of a wind tunnel... would this prevent air from entering from the front?

[@j.wildoutdoors8483]

I've done something similar but with the fan to the wall. It can pick up the dush way better that way rather then just what little bit comes between the wall and the fan.

[@theonlyname4utoob]

Matthias, does putting together those box joints feel as satisfying as it looks?

[@Greighps]

I promise to god your the coolest dude I've ever seen. Seriously. I could only dream to be this damn crafty. you got another subscriber buddy!

[@1g2002541]

I'm thinking of a box fan with two filters on both side. So it would reduce or eliminate the air sucking issue.

[@DoRC]

do you think it might be better to have the fan facing the other way so the filter faces the room?

[@matthiaswandel]

No. See previous replies

[@DoRC]

+Matthias Wandel pshew. had to dig deep to find it but yeah that makes sense.

[@trackguy1]

What tools would you recommend buying for someone who's interested in getting into doing DIY projects? All I have right now is a cordless drill w/ some drill bits, but I'm already seeing so many tools in your arsenal for your projects. What would you say is the bareminimum of tools you need?

[@matthiaswandel]

woodgears.ca/beginner

[@FluffeeKay]

LOL!!!

[@hugorafaelchavezfrias4548]

Gracias matias :)

[@DJ_Dett]

Tighten the casing screws in an incremental criss-cross pattern to maintain alignment on those motors.

[@rdouthwaite]

Or... hit it with a mallet.

[@mikec555555]

That issue with air coming from the front around ends of fan blades is easily fixed by just putting the filter in the front instead of the back. All I do is tape a filter on the front of a 20 inch box fan (tape around all 4 sides). Now 100 % of the air passes through filter. No tools needed, takes about 1 minute to make.

[@Tresla]

your air cleaner videos are my favourite

[@simonwiess3873]

If you want to reduce the fan pull around, make a tube a little longer than the total height of the blade, and as close to the blade tips as you can machine it, glue that to the wood face panel, and set the face panel to be about 1/8th inch above the highest point of the blade. If you wanted to shoot for perfection, you would turn the edges of the fan blades on your lathe so its a perfect circle to fit in your tube, but you're probably not looking to make a ducted fan :)

[@Mienecus]

Brilliant testing!!! However, you lost me; what is the front (I would think the side with the filter, succkimg in air from the dusty workshop) and what is the back (the air is now sucked on from the wall and blown into the workspace)?

[@matthiaswandel]

It's important to blow air into the shop to stir the air. The fine dust I'm concerned about floats everywhere, so it doesn't matter where you suck it from.

[@Mienecus]

Thanks, now I understand

[@JPGuay]

Would mounting it sideways provide a better airflow ? The intake is now facing the wall... A test maybe ???

[@matthiaswandel]

That would be worse. It's important to stir the shop air, otherwise, the air cleaner keeps circulating the same air without cleaning the shop air

[@kmatthewj]

Would it not be better? Because right now you are just blowing a stream of air across your workshop and pushing the dust away from the filters. It could make for an interesting video.

[@Don.Challenger]

The air the fan forces away must be replaced and the replacement flow must come from that shop - out goes the cleaner air in comes the dusty air supposing the filter operates.

[@anonymous_friend]

Great videos. I am curious if by shortening the axle you lose torque? Kinda like how a longer screwdriver gives you more torque.

[@bunberrier]

Designated Chaos is one of my favorite bands!

[@kurtisnelson78]

Wouldnt it be more effective to have he filter side facing the shop as more of the dust would be in the centre of the room. Or putting the second filter on the other side from the first to clean the air from multiple angles?

[@vitriolix]

I was thinking the same thing... that was clean air is blasting against the wall too instead of dusty air. Will cut down on the amount of dust accumulating behind the fan that you'll have to clean out

[@starvingpoet81]

The way shop air cleaners work best is if they're placed against and parallel to a wall - the idea is to get all the air circulating in the room in order to get the most 'new' air over the filters.

[@vitriolix]

good point. if it's blasting the fresh air at the wall that will mostly bounce back and recirculate right near the fan instead of circulating the air in the room

[@THEtechknight]

I always liked your ingenuity. Nice!

[@mmohon]

Perfect timing on your project with the plywood box joints, that perfectly demonstrates something I had questions about. I was planning on building that cool flip over tool box you demonstrated, and I was going to use birch ply from the home depot with some box joints I cut with a router. Is that the "cabinet grade plywood" they sell? Cause they usually only sell 2x4 sheets in either birch or what I guess is pine. Any thoughts on using ply like that for that tool box?

[@matthiaswandel]

I don't know. At my local home depot they have "russian birch" which is baltic birch.

[@redhonu]

Hi Mathias, the reason why the air is going backwards is that one the outside side there is an area if hi pressure, and an the inside there is an area if low pressure. And because she flows from hi to lie pressure, the air flows backwards. if the motor and fan are accurate enough, you could build a duct for the fan. that could greatly increase performance. there is probably better and more information on this topic if you search electronic ducted fan or EDF because it is used in modelling airplanes.

[@matthiaswandel]

It sucks air from the side even without the filter

[@imbly]

It seems to me that a tube around the fan blades would solve the intake problems next to them. I would like to see the difference with and without it if you think it is worth doing.

[@TravisInCanada1]

Hi Matthias great idea using the inner tube suspension mounting. Question though, if the objective is to clean the air does it really matter if it is re circulating the from the front of sides? You want to filter all of it anyway.

[@matthiaswandel]

true, but any air that comes in from the front didn't go thru the filter. I want to maximize airflow through the filter.

[@luizgueiros]

to me you are the best. watch your videos for my inspiration to work.

[@Cpedro1685]

I always see people mounting these units near a perimeter wall. Unless you are using it directly above a specific work station, do you think it would be more efficient if centrally located in the shop? Assuming we are referring to a smaller shop, like a two car garage for example.

[@jdniedner]

Before you have built a radial type fan before with your air siren. These fans can move much more air than a propeller fan, and generate better pressure. Would you consider making one to possibly replace the several propeller type filter systems you have now?

[@matthiaswandel]

A prop moves more air, but at a lower pressre

[@BenjaminEsposti]

5:50 Invest in a small assortment of heat-shrink tubing. I think it's neater than electrical tape, and won't come apart nearly as easily as electrical tape does.

[@connivingkhajiit]

But it can be a real bitch to install

[@ShaneMatthews27]

I just found your channel an hour ago and I already love it!

[@yunus6009]

3 years ago

[@gbusrt6592]

entrainment will help the air flow, you need to guide the air perhaps. a small circler collar around the fan should help, kinda like showing the air were you want it to go if you look at a hover craft driving fan you get the idea, it in a tube to train the air and reduce turbulence

[@thericher]

Thanks, was recently thinking about an air filter in my workshop, I have an old fan so might give something like this a try.

[@EcoMouseChannel]

If you don't have any chaos, then you aren't actually working, just cleaning your shop all the time.

[@jmiller2488]

Great job, but I can't tell if you mounted the capacitor upside down in which case the electrons will leak out.

[@KenWmo]

As an engineer I can tell you that you HAVE to mount the capacitor upside down to prevent leakage. The bare electrons are lighter than the gasses in the atmosphere and have to be contained in a cup to prevent their escape 😮 Matthias, I really appreciate your videos and designs.

[@matthiaswandel]

That's about as good as most of the engineering advice I get in the comments :)

[@handdancin]

im thinking the rate that dust is cleared from the air doesn't scale linearly with the number of collectors, so running them both is probably not clearing the air "twice as fast". any guess on what it actually is?

[@matthiaswandel]

It depends on how you measure. yes, in the same amount of time as one removes half the dust, both won't remove 100% of the dust. But both together will remove half the dust in half the time that one alone would remove half the dust.

[@handdancin]

right, that makes sense. i wonder, as the dusty air passes through the filter, does it remove the same % of dust (more or less) as the overall dustiness of the air decreases? in other words, is the half-life constant. seems like the nature of the filter's construction might suggest its not, but i'm sure my intuition on this is pretty terrible. might be cool to test empirically.

[@grotekleum]

Thanks for showing that. What would happen if the fan blades had the baffle extend say half an inch over the blade tips; would this prevent air being recirculated from the front?

[@matthiaswandel]

Possibly. But I didn't ant to make a new baffle.

[@mlk4343]

Does it matter as far as efficiency that the filter side is at a close distance from the wall?

[@matthiaswandel]

No

[@dogface6040]

YES. For a 20/20 filter, I'd space it about 3--4" from the wall. Otherwise, the center of the air filter doesn't get any air, and the total air flow in the filter/fan is reduced.

[@onionrings5650]

No

[@jeffstanley4593]

Another great video Matthias. Oh yeah, I loved the chaotic corner, I would be right at home, just extend it to my whole work area. You know what they say though, "a clean desk is the sign of a sick mind". Just exchange workshop for mind.

[@Gaehhn]

If you want to find out if a box or something similar is rectangular you should measure the lengths of the diagonals and see if they are the same. It's way more precise than measuring with a square. Especially if the sides are bent in- or outwards it can easily mislead you to thinking that something is square even if it isn't.

[@matthiaswandel]

True, but a square is so much more convenient.

[@Gaehhn]

I always carry a folding ruler in my pocket when I'm working and I'd have to get a square from my workbench which is mostly not where I assemble things. I prefer to glue most things on trestles/stands (I don't really know which term is normally used in English) because then I still have my workbench free for other things.

[@Gaehhn]

That's basically exactly what I was saying only in reverse. Most of the time it's more important for me that the entire box, frame or whatever else I'm building, is rectangular than the corners being exactly 90°. Also if you're building bigger things like wardrobes, cupboards and such you would need a pretty big square (Why do you even call it that? Then again the word we usually use in Germany is "Winkel" which directly translates to angle.) to see if it's a little crooked. And if you add doors to a crooked wardrobe you will see that it's not rectangular very soon. Matthias, could you make a video about how you can test if your tools are correct? Like drawing a line with your square then flipping it over and see if it still aligns.

[@timd3395]

Air flows around the blade (wing) tips from the high pressure side of the blade to the low pressure side. Aircraft wings have wingless to limit this flow for the same reason.

[@timd3395]

wingless s/b winglets (auto-correct fail)