Our DIY oxygen concentrator briefly explained.

[@gautamdamodaran]

Really appreciate your efforts for sharing information the world needs right now. Love from India.

[@cavemaneca]

The cycling noise during operation is extremely satisfying.

[@video99couk]

I think it's alive.

[@badisbouchama1801]

I hate it , it bring back very bitter memories

[@chiragraval4799]

Thanks Mr.Dalibor you are such kind person, Your knowledge is incredible and awesome professional way machine building.

[@nviduumde3497]

Just a thought on the cooler setup: Should you run into Problems with the actual setup, it might be an idea to use a charge air Intercooler, as these are usually designed to handle positive pressure, also the can handle liquid (which in normal operation would be oil). Really good explanation on the machine and although it is purpose made, I really like the 'modular' aspect. Great job!

[@MrTurboturbine]

You could add a cold trap or a desiccant filter to the inlet on the system to remove moister.

[@LawpickingLocksmith]

I love this project. Airplanes used to carry oxygen tanks for the passengers in case of a decompression event. Nowadays just the pilots get bottled oxygen. Each drop down mask in the cabin has a chemical oxygen generator. People tell me that it has a stinging aftertaste. Since flying planes produce constant air pressure, one wonders if such air could be filtered to add clean oxygen to the cabin.

[@fairwitness7473]

I love this! Thank you so much for sharing!

[@jimurrata6785]

And I was just watching Technology Connections about those analog hygrometers, like you have in the funnel.

[@leosedf]

Put an SHT40 digital sensor where your analog one is, you will have high accuracy of temp and hum and really fast too

[@chiragraval4799]

Will you explain/elaborate this thing? Please I want to know more

[@zbdot73]

The sensor does have a heater, it only operates for 1 second, could that be a safety issue with almost pure oxygen? Doubtful but worth noting.

[@leosedf]

@@zbdot73 if you don't activate it I don't think it will be a problem, it needs a special command for it. Even so I doubt it will pose a problem and even if you need to run it you can do it when the machine is not running

@@zbdot73 the sensor needs to be placed on the input side, to measure the humidity of the air flowing into the system, not on the oxygen output... so no risks here

[@kevinmithnick9993]

For better working of your after cooler stage, you can try to make an envelope so the air is forced through all area of the cooling coil

[@safetydave720]

You are Genius. Thank you for this video.

[@markatherton7848]

Thank you for producing this video. I am also making my way through your other content and am learning lots. Regards from NZ, Mark.

[@TheEmbeddedHobbyist]

I have an oxygen concentrator for use with a smiths little torch, very relaxing sound as it switches tanks.

[@jackmclane1826]

You probably have found out by now. But the two throttle valves at the top of the schematic that you left out are actually somewhat important for efficient operation. They increase the pressure swing of the absorber columns and improve the mass of Nitrogen the columns can absorb in one step and can give off in the next. And I think the volume of the hoses at the feed side of the columns is unnecessarily big. That volume needs to be purged every cycle and consumes a lot of air. Having individual 5/2 valves directly at the columns would be more efficient.

[@GodBlessMeX]

Really appreciate for sharing the information. From Hong Kong.

[@daliborfarny]

Are you building your own oxygen concentrator? Post a comment here if you need help.. Good luck! EDIT: The link to the code for Controllino in the description was fixed. I also added info about the molecular sieves we are using.

[@edutate4808]

Hi, I'm Parthiban from India. Pretty impressed with your videos especially with your oxygen concentrator. Here due to the pandemic the oxygen supply is too low and requires some out of box solutions other than the liquid oxygen cylinders. It would be a great help if you can share your oxygen concentrator system schematics and other details so that we can try reproducing it locally. It might save lot of lives.

[@TheOwlman]

@@edutate4808 Check out the link in my comment... Edit: or go and take a look at oxikit dot com

[@crazystuffproduction]

@@edutate4808 kzbin.info/www/bejne/qqDFhqmbqLiCsNk

[@daliborfarny]

@ZolidL Water from the radiator is removed by the water separator (that grey thing with blue elements), the problem is only when you see water drops condensed in the hoses leading to the sieve beds or water leaking from the valves..

[@glasslinger]

Something is strange here. The cycle of this machine is different than the commercial machines. I use two commercial machines that are over 20 years old and have 20,000 hours on them and still produce over 90% concentration. There is no water handling at all in the machines and humidity has no effect on the output. (humidity is HORRIBLE here in Houston TX where I live!) Possibly the type of sieve is the reason. Mine use 13X lithium sieve. That is different than what is used here.

[@glasslinger]

Interesting! This concentrator operates a different way than those I am using. I wonder if this is why this design seems to be so sensitive to humidity. I have no problem at all with humidity affecting the output of mine. (Humidity here in Houston TX is AWFUL in the summer!) The sieve in my machines is over 20 years old and is still working fine. Great job on the machine!

[@xpiyrw2374]

How is this one different that yours. ?

[@glasslinger]

@@xpiyrw2374 Mine works on pressure selective separation. The sieve canister is compressed with fresh air. The nitrogen binds more to the sieve than the oxygen. The pressure is released through two valves. The first is the oxygen valve, which lets the pressure drop while the oxygen is expelled. Then the valves switch and the pressure is allowed to bleed all the way down as the nitrogen is expelled. The oxygen goes to the outlet, the nitrogen back to the atmosphere.

[@jhyland87]

Amazing work... I'm so jealous. I wish I could make this >_

[@peterciurea7771]

I wonder if it's possible to also capture the "exhaust" air. In theory, just as you are concentrating Oxygen in the gas you keep, you are, in effect, concentrating Nitrogen in the gas you exhaust. So could the same machine be able to generate nitrogen? i suppose sending it to a further cooler for Liquid nitrogen or collecting it as a shielding gas for welding/laser cutting?

[@glasslinger]

Nitrogen is a reactive gas at high temperatures which is why it is not used in welding.

[@xpiyrw2374]

@@glasslinger nitrogen is used as a cheap "shielding gas" in MIG welding.

[@linuxranch]

Dalibor, what is your cold tap water temperature? You may be able to lower the dew point of the incoming air using a water to air heat exchanger. Alternatively a refrigeration cycle might work if water is expensive or scarse. You can buy commercial air driers. In the US they are common in pneumatic control systems. A silica gell bed with a color change indicator could be used as well. A two bed system would allow you to regenerate the wet bed, while it's neighbor was in use. There are also automatic water drains that have a float that drains water without wasting oxygen. What are you using for fuel gas? It looks like you are using acetylene. We used to use hydrogen as a fuel gas. With no carbon there was less contamination of things like the wires going through the tube seal. Since you need both o2 and h2, what about using electrolysis to generate both gasses at once?

[@GoalOrientedLifting]

I never knew that I wanted to make a machine like this, before i saw this video. But I'm gonna make an ozone machine first

[@ejoep]

Thanks sir this will help many people survive the pandemic.

[@travismiller5548]

Great build! Have you had to rebuild compressors yet? if so- are you wishing you had put them in a more servicable location? I'd like to build something similar someday, but I might put the compressors on top? Thanks!

[@richardohare7708]

I used to work on o2 concentrates as part of an ozone disinfection system. This looks exactly the same and is well built. They should be sending lots of these to India etc. Rather than relying on bottled gas. Its getting the sieve beds or getting hold of Zeolite that could be hard to get

[@user-qf6yt3id3w]

Interesting how 'EEPROM failure' is one of the fault conditions. I wonder if they're doing frequent writes to it? I remember those 8 pin serial EEPROMs used in embedded systems would die from that.

[@andymouse]

That's right, only a finite amount of read/write cycles...cheers.

[@daliborfarny]

It is usually 100 000 cycles for modern EEPROM, I would consider it a serious bug if an oxycon needs to do this amount of writes :-)

[@twobob]

@@daliborfarny if you store "Breathe in, Breathe Out"... you would get 5 days )

[@guilldea]

Beautiful work

[@mikemiller659]

As a O/2 consentrator service tech for many years I see Invacare sieve beds..a heat exchanger mand air compressors

[@davegeorge7094]

I think your wrong on the 85% concentration, it should 95%. Thanks for showing a well built, no cheap stuff, elegant system. Brilliant use of seperate high pressure pilot valve design. That must be custom modification, valves don't have pilot port unless you really shop around?

[@chrispate4512]

excellent video, thank you, its got me thinking.......

[@abhishekkuksal5700]

What type of Zeolite Sieves(grade) you use? Please share some insight on it as well. Thank you

[@HomeDistiller]

I was going to ask the same thing 😂

[@trkadam58]

JALON Lithium Molecular sieves JLOX 101

[@daliborfarny]

I added this info to the description.

[@abhishekkuksal5700]

@@trkadam58 Thank you

[@abhishekkuksal5700]

@@daliborfarny Thank you soo much!

[@baradeithel]

That radiator would introduce lead to the system. Car radiators were popular with moon shiners for making Booz but it would contaminant the finished product. I think they dip them in molten lead to seal them. But anyway that was my only concern

[@daliborfarny]

This one is new, I don't think it contains lead (considering RoHS and other regulations - even though lead is allowed in automotive)..

[@hotcyr]

It was true for the old copper radiators that were soldered with lead (many decades ago) but he is using a modern all aluminium core rad with plastic end caps. No lead in there.

[@glasslinger]

Lead is a SOLID not a gas! DUH!

[@kokoferi3767]

How much pressure it maksimum for inlet sieve bed?? Is it ok if 8 bar??

[@fasted8468]

Is there a relationship between the pressure of the air in the zeolyte that absorbs the nitrogen and its effectiveness? Is the reaction responsive to pressure or not, is there an ideal pressure? I can hardly describe my head is killing me. Hope you understand

[@omarbadawoud2373]

thanks for all this good information

[@DubDado]

we say Dado for Dalibor in croatia, its me :-) greetings from graz/austria

[@TheOwlman]

Oxikit, whose channel is kzbin.info/door/Hh-VoQp4_IM_m6r_40oJQQ, is another source of information and an open source design. Edit: The Oxikit design is intended for medical use and is designed to use easy to obtain parts.

[@sammyd7857]

What is the use of a valve parallel to an open line

[@honeysingh-yk1xb]

Are you using equlizer valve at output to reverse the pressure to exaust nitrogen from zeolite cylinders ?

[@dansv1]

Does the air going into the machine come from outside the room, and is the excess nitrogen exhausted outside also?

[@daliborfarny]

No, it is all done locally from/to around the machine.

[@dansv1]

@@daliborfarny It doesn’t make it harder to breath for the people in the room?

[@daliborfarny]

@@dansv1 We have this machine in a separate room, the workshop where the oxygen is combusted with propane (burners) is ventilated (fumes extractors).

[@japlavaren]

hi, nice work, I really like your videos. But as I understand it - you disassembled 6 working machines to just move components to one base? What is advantage of this - I mean why you just did not connected all 6 machines outputs together?

[@sheep1ewe]

You need to make some minor changes (like the valves and storage outlet, etc) as he talked about here in order to make the work seamless in a chain, he also added the externa cooler and the improved water separation, etc. If You plan to use a smaller unit, like for glassblowing experiments or something like that You can of course chain up two or tree modifyed machines after those internal modifications.

[@daliborfarny]

Hi, thank you! The original machines were not working properly - leaking valves, bad sieves etc.. they were stopping all the time, leaving us without oxygen in the middle of work :-). Also, they were occupying lot of space.

[@pexafo6694]

Seems like more convenience to have them all in the same place with a single output, and he mentioned that they had to be modified anyways to remove unnecessary safety features.

[@BigBoy4005]

This unit uses jellybean parts that can be had all over the world in the space of a week; the Invacare parts are almost impossible to find cheaply on a normal day - right now it would be truly impossible with the pandemic. The pilot-operated spool valves (plastic) in the original are prone to failing and intermittent sticking.

[@ayushyaagrawal4052]

How much o2 rich air is used to clean the slieve ( how much % of o2 made is to be bleed back ) I am trying it please tell

[@Bro4mIndia]

Hello, need help.. I have build one based on 1/6 hp compressor and 2 zeolite bed using RO membrane each filled with 1/2 KG zeolite 0.3-0.8mm. unfortunately I see no pressure building up in the beds and out put is still the same 21% purity only! I have used RO parts and value controlled by Arduino relay coding..!! Is it something Wrong with my zeolite ? Or how much zeolite should be used in each bed & how much should be the bedsize.?

[@chetantelang6588]

Which type of valves have you used in these concentrator we are also working on the medical concentrator just need some help

[@omsingharjit]

4:48 if it saturated with N how it desaturated ? Without doing any treatment like heat treatment or else ??

[@Thermoelectric7]

Pressure in the zeolite tank is released to atmosphere, nitrogen leaves due to the lower pressure. Equalization valve helps to purge any excess out when regenerating.

[@vaibhavarghode2211]

Very good explanation sir. Please can you share the details of Molecular sieve (Zeolite) used in the column like 3A/4A/5A/13X, which one to be selected and its respective mesh size.

[@TheExplosiveGuy]

1mm diameter 13x.

[@717Fang]

Best to use 5A

[@0ptimusWalrus]

With another oil-less compressor you can pump into larger, high pressure O2 tanks. Oxygenfrog, highvolumeoxygen, and OnSiteGas are commercial versions but a homebuild is easy, especially if you already did this.

[@wantanmee8716]

Nice. What about molecular sieve regeneration?

[@peterciurea7771]

just heat them up in an oven every year or so , depending on usage levels - good to go

[@nelsonreis8285]

@@peterciurea7771 Can you explain that more in detail? Does it reallywork?

[@peterciurea7771]

@@nelsonreis8285 yes. It's what they recommend in turbo molecular pumps. They tend to not mention it in concentrators because they want you to come get the cylinders refilled. Just make sure you have a way to remove and replace the sieves and still have the cylinder airtight- you don't heat them in the aluminum tanks, it will weaken the aluminum. Pop them in a steel vessel, heat to something like 400F for a couple of hours, drive out all moisture and adsorbed gas. you might need to reactivate them with acid if they are really bad- there are tutorials on how to do that on youtube

[@merspodeg3969]

thanks for the really helpful content, you think it's possible to upgrade a 5 lpm oxycon to 20lpm or more, instead of chaining a bunch of fives? is it the compressor or the size of the sives or what? just trying to feagure it out! thanks again for sharing your knowledge

[@fss1704]

It's all about the compresors.

[@Fullscreen007]

Awesome Video, this is the shit, i love on KZbin, greate Community with greate ideas! This is definitely my next project in my Garage! Have i replace the Molucular sieves some time or hold it for ever? And can i use empty fire extinguisher as oxygen storage? What Model is the Kompressor From Thomas you have?

[@WoodyONeal]

What was the highest purity achieved and at what liter flow?

[@eazanhan6366]

In this video, it achieved around 90% and the flow is more than 10liter. The molecular sieve can reach 93%±3 .

[@squeezedoz]

What would you estimate the cost at of this system? Do you see elements that are not necessary or can be made to the lower cost?

[@glasslinger]

I think cycling cylinders in parallel would work and eliminate compressors and valves. Of course the compressor you use must supply enough volume. The commercial high volume systems tend to use one compressor and larger beds.

[@chiragraval4799]

Sieves bed is we use three compartment as 1/2/3 compartment fill with following grade so it is more cheaper solutions? Compartment 1 filling up with 13X HB Compartment 2 filling up with Zeolite 13x Liz Compartment 3 filling up with Zeolite 13x HB. Lithium base Zeolite need more efficient filtration for medical oxigen. Lithium is R-Active property right?

[@triprjt7857]

how do you make the cylinders for sieve bed assembly?

[@glasslinger]

@@triprjt7857 Buy them! They are cheap! www.healthproductsforyou.com/p-inogen-at-home-replacement-column-pair.html?gclid=EAIaIQobChMIz7HMzJ_O8AIV8hplCh2xXQ-JEAQYBCABEgJtIfD_BwE

[@chiragraval4799]

@@triprjt7857we try to develop trial is ongoing

[@chiragraval4799]

@@glasslinger thanks for this information

[@167mm167]

awesome ...

[@abynarainsingh]

where to buy oxygen meter?

[@MetalDetectingOutWest]

Thank you for your informative video. I am in the process of building a prototype Oxygen Concentrator Machine, with optional Oxygen and Nitrogen Tank Refill Ports. All connections will be built with quick change connections, for easy maintenance. Unit will have digital gauges allowing manual adjustments to Oxygen / Nitrogen concentration, Humidity, air temperature, and air flow. Unit will have an optional Bluetooth / wifi app for Android and Apple devices.

[@ErikAnders]

Wow ❤❤❤

[@nigelsmith7955]

Excellent video, I guess you used the compressors from the original units as they came with, and saved you some money. However in your cart could you replace the six for say two larger capacity compressors but still feeding the same manifold? The 3 way valve was an excellent idea, you could add moisture sensors inline to each tank that could over ride the valve port and close that unit and light a service lamp! (One of yours of course 😊)

[@chiradeepbanerjee2229]

please give the sources of zeolite.

[@daliborfarny]

Added to the description.

[@backspace27zul]

how many watts of the air compressor motor?

[@abhijitnaskar5011]

in our country now we are facing oxygen issue due to pandemic situation , can you help me out with raw metrical for build this ??

[@abhi135636]

I have a few questions sir kindly help if possible :- I am trying to design a PSA device capable of producing oxygen of 90-95% concentration at 60 l/min I have gone through many resources and have chosen zeolite 13X as the molicular sieve as its economical and somewhat available then zeolite LiX which i know is better but expensive so I want to know the total amount of zeolite 13X that will be necessary in kg for this project I have chosen a pressure of 120-130psi for the adsorption cycle and thinking of cycle time of 20-30s do i have to keep the adsorption chember at that pressure(120-130 psi) for the whole time (20-30 seconds )or i can just start collecting oxygen as soon as that pressure reaches during desorption cycle will normal atmospharic pressure be sufficient or i will have to apply negative pressure In my design to reduce humidity I am thinking of using silica gel chamber but you are using just condensation in your design is silica gel chamber not fisible?

[@glasslinger]

The 13X sieve is not sensitive to humidity like the lithium sieve used here. You do not have to pump the oxygen out, it will flow by itself by virtue of the pressure used to charge the sieve bed. Note that there is an upper pressure limit to the process. Going above this pressure is useless, producing no more oxygen but using up power. This could overheat your sieves.

[@swarnenduray9582]

I am from India. I made a concentrator following oxikit.com. But I have problem regarding moisture condensation in air line... please suggest.

[@McTroyd]

He shows this in the video. Output from the six compressors gets sent through a car radiator on the side of his machine. The pipes through the radiator are oriented vertically. When the air is cooled, water drips down (and out a port on the bottom), dry air moves up. He also runs it through an additional water separator before the air hits the zeolite tubes.

[@swarnenduray9582]

@@McTroyd thanks a lot sir

[@McTroyd]

@@swarnenduray9582 No worries.

[@pradeepkumarsundararaman6520]

sir great video i am also from.india i hv plan in mind hence hv a question would like increase the pressure of purified oxygen say upto 2.5 bar ( v humans inhale oxygen at 1.013 bars at sea level) Now can v do this for increasing the purified oxygen pressure to such level. Then this will act as Hyperbaric oxygen which has other medical purposes sir can u reply n if so how to do this

[@eazanhan6366]

It can't do like that

[@martinanonys3202]

with another compressor added to the output, you can make any pressure you want. that's how 2,500 psi oxygen tanks are filled!.

[@raghavendrasooda5368]

sir may I Know the compressor model number and brand name

[@sammyd7857]

actually the car radiator is designed for around 25 psi

[@devinurtsyani]

I'm from Indonesia, we r in big trouble right now. Delta variant is everywhere, each of our friends start to die... Could you explain about the bed sieve, how you make it? Especially the top of it, the black one. We try to build oxy concentrator too

[@eazanhan6366]

And the oxy molecular sieve in this video is also supplied by us.

[@hp5683]

11:35 Equalising valve company name and model please?

[@KallePihlajasaari]

I think he said is was salvaged from the O2 concentrators that were the source of the sieve beds. It is just a simple valve used to quickly pressurise the fresh bed before pushing compressed air in. He said they removed the flow restrictors from the O2 output lines so the valve may not even be needed but using the restrictions and the valve improves the efficiency/concentration somewhat.

[@hxka]

Huh, so "oxygen concentrator" is a bit of a misnomer, they're really nitrogen removers.

[@sheep1ewe]

Yes, those are very simplifyed, they are originaly designed as medical respiratory equpiment (like for persons who suffer from silicos infection or lung cancer), not for producing industrial grade purifyed oxygen.

[@SeanBZA]

Yes, I used a similar capillary tube permeable membrane unit to generate high quality nitrogen to be used as an inert fill gas for a packaging line, which worked out cheaper than using tanked or cylinder nitrogen, and which had a break even point after 6 months. Just needed a 6 bar supply of very clean air, so had a cascaded series of filters for it. First 2 were regular air filters from the pneumatics supplier, to remove oil and water, and then a 0.3 micron filter after that to get more out. Then 2 cascaded ultra filtration units which got the feed air down to the desired cleanliness. I used to change those filters every 3 months, throw the first one away, and move the second one to the first bowl, and put the new one in the final position. The first filter would be dirty, but in general the second would stay very clean. Took the oxygen down from 21% to around 2%, though you could get to 99% but only at lower flow rates, so the 98% with a higher flow rate was better, as it was able to purge the packing area more effectively, and the product entering there would get most of the oxygen removed from around it during the pack cycle, and finish off at around 4% oxygen, which made shelf life a lot better. Yes i did use an oxygen sensor, but after the testing it was not used again, as it only has a operational life of 6 months once opened to air, as it is an electrochemical cell, and replacement ones were extremely expensive, as it was EEX rated.

[@sheep1ewe]

@@SeanBZA That was genuinly interesing, i was actualy trhinking about exactly this on another place.

[@bill200262]

@@SeanBZA thank you for your kindness please will you be so kind to facilitate information about this project

[@DeadeyeDaily]

Funny how that works, huh? It's the same thing, described in different ways.

[@bloviatingbeluga8553]

Technology Connection would have a fit over your humidity meter haha

[@NiHaoMike64]

Some compressed air dehumidifiers work in a very similar way but with silica gel instead of zeolite. Would it be possible to have it deal with the moisture issue by adding silica gel cylinders ahead of the zeolite cylinders?

[@richardohare7708]

The zeolite absorbs the nitrogen in the air which is drawn in from atmospheric air, and the output from the sieve beds I'd just pure oxygen. Silica gel is used to remove moisture. It is different so I wouldn't think you can use silica gel.

[@glasslinger]

The amount of silica gel required would be huge! It absorbs water slowly so to handle the flow of the machine you would need cubic feet of it! Then you would have to have means to dry out the silica gel regularly. The radiator method is much more suitable.

[@abdellahtech4630]

Please sir, how is the air coming out of the compressor cooled to produce cold oxygen for us. What do we use? I would like the name of the device please and the names of all the materials used in the oxygen concentrator. Thank you in advance for your efforts.

[@lorenzo42p]

turn it off, you're sucking all the air out of the room! neat machine

[@nathantron]

This is not something general medical staff will be able to manage. This machine once setup in a production environment should be isolated and be operated by a single knowledgeable individual.

[@sootikins]

Is your collection block and pressure gage rated for oxygen service? People trying to copy this system need to understand that concentrated O2 requires special fittings, piping and manifolds (etc) and everything must be perfectly free of oil, solvents, etc. ("oxygen clean"). Concentrated O2 can and will cause spontaneous combustion of incorrectly spec'd, designed and cleaned piping systems! It is far more dangerous than you'd think.

[@daliborfarny]

The oxygen here is never above 2 Bar, what you wrote applies to oxygen under high pressure.

[@sootikins]

@@daliborfarny Thanks for explaining. I would still advise people to be careful to keep things clean. In my youth I succeeded in making grease ignite spontaneously by sticking the tip of an unlit oxy-acetylene torch into it and turning on the oxygen valve. I'll admit I had to really work at it to make it happen though.

[@ZebbMassiv]

Oxygen Frog is already a product

[@sto2779]

Just looking at that machine gives me a heart attack lmao seems like its worth a brand new car lol

[@VentureWelding]

Looks like 15k worth of parts.

[@karhukivi]

Be careful to position the air entry where it cannot pick up vehicle exhaust, or otherwise you might be concentrating some carbon monoxide with the oxygen. This has happened to divers compressing air for their cylinders with fatal outcomes.

[@indiappeoxygenconcentrator1531]

I have for sale in delhi . 10 Lts

[@omsingharjit]

You is great but not easy to build

[@DanielBrownsan]

EVEN IF you are right, I feel like you shouldn't be making these claims. MEDICAL-grade oxygen is, at least not obviously, your specialty.

[@KallePihlajasaari]

He repeats more than once that this is for oxy-fuel torches for working hot glass and not to defeat the safety systems in the medical units if using it for breathing oxygen.

[@antidecepticon]

This is fun and all but can we appliy this knowledge to owning our own land and tools of defence and not be injected every 4 months

[@DonnyHooterHoot]

Oh ya sure I'll just build THAT! lol In my basement.

[@jeffproulx3388]

The sad part is most people think they can't do things like this. Yes you can build this in your basement you just need to put the work in.

[@DonnyHooterHoot]

@@jeffproulx3388 LOL! Ya sure! LOL!

[@kening95]

Totally impractical buy one..

[@miro2424]

6 oxygen concentrator machines in one. No noise suppression what so ever. Nothing special. Produces the same output.

[@daliborfarny]

This machine has its own small room with 1m thick walls - that's the noise suppression :-)

[@glasslinger]

@@daliborfarny Yea, I'm busy making the molds to make the 1m thick walls for my concentrator room! (grin!) Not everybody has a CASTLE for a shop! Great idea on the concentrator but I think you are using the wrong sieve material. I have no problem with moisture at all with my machines and the humidity here is AWFUL in summer. The 13X sieve is drastically cheaper than the lithium stuff and seems to not be bothered by moisture.

[@micaxito]

@@glasslinger what is the highest humidity range you have? Here, in pacific coast it tops 98% relative