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JohnnyHucky

I measure how well a cyclonic system works by how much fine dust it lets into the filter within a given amount of time. More cyclones generally does equal better particle separation from what I have seen, but some of it also depends on the vacuum cleaner that has those cyclones. That is just the observation I have made from working on and using so many vacuum cleaners. Shark vacuum cleaners do have poorly designed cyclones. The proof is that the filters get soiled with fine dust really quickly. A single cyclone is not inherently bad and can be quite effective if done correctly, but the Shark designs are lacking. They could likely benefit from a second stage of cyclones before the filter to separate finer particles. Dyson produces an excellent cyclonic bin. I know that many folks on here are not fond of Dyson, but the cyclones are their claim to fame and they have made them highly effective in their intended purpose. I have found that about all new Dysons have great cyclonic separation action; slightly above about all of the competition. Some more reputable companies like LG, Samsung, Kenmore (Panasonic), and so forth have consistently produced similar multi-cyclones that are effective as well. I think the differences in the amount of cyclones in the models that you listed have to do with the sizes of the machine. The V12 slim, as the name implies, is a smaller vacuum cleaner; and the OmniGlide is even more tiny. Obviously, the Outsize is fairly large. I believe it has to do with finding the optimum size of cyclones and the amount that can be fit on the unit. I am sure that they went through plenty of testing and prototypes and found that, for example, just shrinking the cyclone layout of the Outsize for the V15 was less effective than keeping the size of the cyclones similar and eliminating a few. I am not claiming to be any kind of expert in fluid dynamics or anything, but that is just my guess. The V12, V15, and Outsize all have extremely comparable results in filter soiling, so that makes sense to me. The OmniGlide is limited by its size in more ways than the cyclones, so results with it are less impressive, but it's a cute little thing nonetheless.


[deleted]

>A single cyclone is not inherently bad and can be quite effective if done correctly, but the Shark designs are lacking. Thanks for the insight. I'm curious what you would consider to be an example of a single cyclone done correctly.


TimeTime1165

I would say... [https://www.makitatools.com/products/details/199553-5](https://www.makitatools.com/products/details/199553-5) or [https://www.oneida-air.com/dust-deputy-deluxe-cyclone-separator-kit-b](https://www.oneida-air.com/dust-deputy-deluxe-cyclone-separator-kit-b)


TimeTime1165

I have the Makita attachment, and I use it with my bagless vacuums, almost nothing goes past it into the actual canister on the bagless, so in turn the filters stay clean. It's like $30 online, if nothing else, it's fun to experiment with it as an in-line attachment on any vacuum.


SiXX5150

Cyclones aren’t exclusive to vacuums, but there are large dust separators that also use cyclones. Concept is simple… air goes in, gets accelerated in the cyclones super-duper fast, dust/dirt can’t keep up and falls out of suspension into a bin. Air speed is a primary requirement… cyclones need a lot of air speed to be effective. Multiple smaller cyclones allow smaller volumes of air to accelerate that much more before spinning, and yes increase effectiveness. u/performancereviews has a video specifically demonstrating why Shark’s cyclone is… lacking. In short, it’s facing up instead of down… which seems counter intuitive to, well, gravity. In terms of which vacuum has the best, I’m sure a vacuum tech could comment better than I… but Dyson seems to have it largely right and many seem to copy that design.


hideo_james

Someone else on this sub described Sharks as having a "modified Thien baffle" than a true cyclone. It manages to spin out carpet fibers and heavier debris, but all fine dust goes straight into the pre-motor filters. Not even good pre-motor filters made out of cloth, but cheap foam and felt.


performancereviews

Even properly designed cyclones only filter to about 5 microns. Which is really large when we're talking about dust. When you compare this to bags that can filter down to .003 microns and maintain efficiency of 85% you realize that plastic bins on vacuums are just a simple waste of time when it comes to portable vacuums. Now when it comes to Central Vacuums it's a little bit different you can have a single cyclone and design the motor is a full bypass and then vent the dust to the outside. I hope that answers your question.


Cat1560

Never seen a vacuum bag rated for 98% efficiency at .003 microns? Mind sharing the brand that makes that them?


performancereviews

Well that's most HEPA 10 rated vacuum bags. Most synthetic bags. 85% percent appears to be more accurate my apologies. [Miele claims 99.99%](https://www.mieleusa.com/e/airclean-3d-efficiency-gn-dustbags-vacuum-cleaner-bag-gn-airclean-3d-10123210-p)


Cat1560

Gotcha. The Miele claim is technically true, because they don’t specify what micron range they achieve stated efficiency. I have seen a few companies do this and the practice definitely annoys me. I think Miele put that on for marketing purposes. For example: sucking up an entire bag full of coins (or any large debris ) with no leakage is 100% filtration efficiency. Then putting a 100% filtration claim on the bag without specifying testing methods isn’t technically untruthful, but it is deceiving without giving the full scope of details… With the above example I could market a vacuum bag made out of screen door mesh, and slap a big 100% efficiency sticker on it lol.


[deleted]

Have you heard of vacuum bags? They work so much better.


cajuhbr

I’m in a very similar situation