Gravitational ventilation - methods for dust and (maybe by the way) suspended du

Hello!
I live in a block of flats, in the city, in addition on the ground floor. I have long recognized the fight against dust as a loss - no matter how much I get when cleaning, soon after all all black elements are gray and cats from dust fly across the floor like dry bushes in wild west films.
Recently, however, I am thinking a lot about the famous smog because it is loud everywhere, and I began to wonder if I could do something to improve the quality of air in the house and by the way cover the problem of dust. No one at home has any allergies etc., but with the increase in awareness of what we are breathing, the internal need to respond in any way increases.
I began to think about using window ventilators as filters, which probably get 99% of pollution into my apartment. Ventilation generally works great - it pulls in the kitchen and bathroom, and all fresh air ventilates beautifully "fresh" air.
Now yes - I considered:
1. Installation of the filter fleece used in vacuum cleaners inserted under the vent, yesterday, even with the inflow of ventilation in the middle of the night, I installed two such "devices". I'll take it off in a few days and check what has stopped on them. The solution has one minus - it significantly limits the air flow and it seems to me that I would either have to use the nonwoven fabric already in the ventilator from the inside or mill more holes in the window frame (currently only 1/3 of the ventilator cross-section is used in the factory, I suspect that according to with a project because if the whole air flowed, I probably wouldn't be able to keep the apartment warm). This solution also does not solve the topic of suspended particulates.
2. Installation of Ventboo filters http://www.ventboo.pl/. They don't convince me something, I don't know why, theoretically the producer gives about 90-95% of dust filtering and there is nothing about smog, etc. Generally, it looks a bit like a marketing gimmick - a thin film, which because it stops something , after a while it turns black and the user is excited that "it filters so well".
3. The same as above, only with the use of the pollen filter used in cars. Theoretically, this should stop everything, including bacteria etc. in the activated carbon version. By the way, even the carbon version has a white outer layer and it would be known after what time to consider replacing. In addition, the solution would not be expensive - you only need the largest filter, just remove the frame and cut into strips.
The MANN filter producer gives very promising info: https://www.mann-hummel.com/en/corp/news/news...83f1bf086b4fe21f4ec8cb&tx_ttnews[tt_news]=682
4. Also like the above solutions, but using a filter through which air enters the engine. Certainly a very cheap solution and it seems quite effective, although it can give a lot of resistance.
5. And the same thing again, but with the use of a filtration nonwoven soaked in activated carbon, used e.g. in hoods or recuperators (e.g. https://pureventfilters.eu/filtry-plaskie-weglowe/535-filtr-plaski-weglowy-g4- 396x245.html)
6. I like this idea the most, although the implementation can be a little complicated. I was thinking about using a hepa filter (e.g. h13 to capture over 99% of impurities) that is used in vacuum cleaners. The only problem is that it will stand out a lot and you would have to make a somewhat aesthetic "can" in which you could place such a filter. The advantage is the low price - a dozen zlotys, and a large cross-section of air flow.

If any of you have similar thoughts, feel free to write. Or maybe you already have some solutions of your own, or there is something ready on the market that I haven't reached?

Best wishes
Peter

A little update. There was not enough time to do something "more specific", so about two weeks ago on impulse I put under 3 ventilators a piece of a regular inlet filter from a vacuum cleaner and here is the effect:

I do not know to what extent it is dust and to what extent particulate matter, I only know that quite a lot of it considering the time in which my "devices" were mounted, and that it was a period when there was no smog as such.

When buying vacuum cleaner bags, I read their theoretical parameters, which look promising, hence the new idea was born:

This is a plain strip of non-woven fabric cut from a vacuum cleaner bag. It's nice that one bag was enough for all 5 ventilators in the apartment and the fact that when mounted in a way from the photo a very large filtering surface was created.

After some time I will remove the covers and send a photo.

Regards
Peter

I am still fighting, though I still have little time. After 10 days of installing the filters from the vacuum cleaner bag, the following accumulated on them:



I noticed that the clean pads put on clean at the time when there is no smog threat, change the color much more slowly than those assumed when the concentration of suspended dusts is above normal. Since the idea was created, I have processed 5 such sets. I would add that this black "something" smells very strongly of smoke / soot so they are probably suspended particulates, just the question whether only PM10 or PM2.5 can be captured.
In the meantime, I noticed a significant decrease in ventilation efficiency, but all in all I expected. Hence another idea, also based on the same material. The old zelmer vacuum cleaner tip and a piece of pipe sheath came to the rescue:





At the moment, I do not care about aesthetics, although it is almost unobtrusive behind curtains. After a month of installation, the interior does not differ much from the previous version, but you can still feel a large air flow, filtering area about 20x larger than before. If you need to "screw" the air flow a bit (as for example in severe frosts) just roll up the bag and fasten it with a rubber band

Regards!

I have had recuperation since January. I am currently filtering exhaust and supply air sequentially:
1. filtration mat with Allegro G3 on the intake screen and exhaust air diffusers. I gave the funnel on the mat a funnel glued with hot glue and this solution is several times cheaper than the original funnels and has a larger capacity.
Here I described and photographed:
https://www.facebook.com/groups/329438764201077/
2. G3 or G4 filter mat in duct filters in front of the intake and exhaust recuperator connectors
http://allegro.pl/filtr-kanalowy-fko-200-mm-okragly-wklad-eu3-i5820342745.html
this is my filter. The cost is PLN 100.
3. Filter fleece directly on the recuperator filter - probably there is no class, but I see that it is gray, i.e. something stops.
4. M5 filters in the AirPack Home recuperator.

This set of filters initially catches a large amount of contaminants, which is necessary for applying more accurate filtration.
I plan to use a more accurate filter to catch suspended dust by installing it on the supply air connection, i.e. behind the recuperator.
The easiest and most expensive will be to give a factory solution for 1200 PLN with a F8 pocket filter and a pressure switch showing filter wear. New filters are around PLN 200.
Unfortunately, this solution has such a problem that it is very expensive. Paying 1200 PLN for a simple box is painful. I am looking for a cheaper solution.

In my opinion, gravitational ventilation cannot be effectively filtered. This requires multi-stage filtration or very frequent filter replacement, which will quickly get boring.

@Jan_Werbinski
What about smells coming from outside? There are no problems with this?
At alledrogo I saw some active carbon mats or something, but does it work ....

idepopizze wrote:

@Jan_Werbinski
What about smells coming from outside? There are no problems with this?
At alledrogo I saw some active carbon mats or something, but does it work ....

There are no smells, because I have installed correctly: away from sources of smell, away from the street, away from sunlit walls, at a suitable height from the ground.

And you don't have any ambitious smokers or grillers behind the fence?

I have a window near the place where I plan to set up an air intake (north wall, about 5 meters above the ground, always shaded, on the opposite side of the street) and from time to time, however, smoking residues reach there.

I have smokers and barbecue lovers. The former are on the windward, but before the air reaches the building, to the leeward air intake it is impossible to feel anything. The grills are leeward.
Since the recuperation was started, the necessity of closing the windows disappeared, when the neighbor came out on the first bubble and woke us up with the stench.