Cheap Air Filtration System / Filtrer l’air à peu de frais

J’ai été inspiré pour ce projet lors d’une émission du réseau PBS de la télévision américaine.

La qualité ou le degré de filtration est déterminée par les filtres.

Mon besoin étant limité à la poussière, j’ai acheté 8 filtres comme ceux-ci, lesquels sont normalement utilisés dans les fournaises à air pulsée. Les meilleurs filtres peuvent capturer les virus (pensez COVID-19 entre autre), le pollen, les odeurs, la fumée, etc.

I got inspired for this project while watching a program on PBS network in the USA.

The filtration degree or  quality is determined by the filters. My need being limited to dust, I bought 8 of those filters, which are normally used in air furnace. The best filters can capture viruses (think COVID-19 as example), pollen, odors, smoke, etc.

Premièrement, les filtres sont rassemblés ainsi, le flot d’air (cercles) vers l’intérieur du cube.

J’ai utilisé le pratique ruban de conduit.

First, filters are gathered as shown, the air flow (circles) towards the inside of the cube.

I used the handy duct tape.

Ensuite tous les joints sont scellés, et ce partout (flèche) !

Then all joins are sealed, and that everywhere (arrow)!

C’est un bon début.

It’s a good start.

Le dessous est scellé avec un carton bien d’équerre.

Notez également que tous les coins sont bien scellés.

The bottom is sealed with a square cardboard.

Also notice that all corners are well sealed.

Le ventilateur est installé sur le dessus, le flot d’air vers le haut ou l’extérieur du cube, et fixé avec le même ruban.  Pour un ventilateur rond, un carton comme celui du dessous, serait découpé en conséquence.

The fan is installed on top, air flow up or towards the outside of the cube, and secured with the same tape. For a round fan, a cardboard such as the bottom, would be consequently cut.

Tout le périmètre doit être scellé.

All the perimeter must be sealed.

Des languettes de ruban plus étroites sont idéales pour les coins  ronds (pensez ciseaux).

Narrow tape strips are ideal for the round corners (think shears).

Et voilà ! Le tout étant très léger, la poignée du ventilateur est amplement suffisante pour le déplacer.

That’s it! The assembly being very light, the fan handle is more than adequate to move it.

Après quelques jours mes sinus se portent déjà mieux !

After couple of days my sinuses feel better already!

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Soyez toujours prudent et bon bricolage !

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Always be careful and Happy Woodworking !


18 Responses to Cheap Air Filtration System / Filtrer l’air à peu de frais

  1. Paul says:

    Serge, thanks for another great idea, I’ve seen alot of guys just tack a filter to the side of the fan, but it doesn’t last long. This is definitely cheap, they put those filters and fans on sale all the time.


  2. josee says:

    Vous êtes un génie 😃


  3. Loren Haas says:

    Serge, I used a very similar arrangement in my home in Napa, CA during the terrible fires we had this summer. It worked very well and I now keep a stash of these filters on hand. Fortunately my work place are very well ventilated so I do not need this in my shop.


  4. Mark Butler says:

    Serge, I could have used this last week. I have a dust filter system mounted on the ceiling but I was refinishing my workbench and although I have a hose on my belt sander connected to my dust collection system the dust was flying everywhere. I tried the filter on a box fan years ago, but like you said, the filter plugs fast and there is not enough air flow to do the job. I still have the fan so all I need now are the filters.

    Thanks for sharing this. Hope you are keeping well.
    Cheers Mark


    • Serge says:

      Hi Mark, I’m glad I saw that PBS TV program showing the how-to and and explaining all relevant explanations. And I agree, a box fan with a single filter is not efficient at all.
      I’m fine, thanks for asking, and I hope you are doing well too. One benefit of being older is the fact we are (should be) wiser during this pandemic. Lol

      Liked by 1 person

  5. yanoukdesign says:

    Bonjour Serge, j’espère que tu vas bien (d’une manière générale). Intéressante ton idée (j’ai déjà subi une opération des sinus…). Par contre, quel genre de ventilo (le truc carré que tu mets au dessus) utilises-tu ? A bientôt.
    Ps : pour le reste, je me suis mis au soudage Tig. Ceci augmente beaucoup le champ des possibles dans mon atelier. (Et on peut souder sans étincelles).


    • Serge says:

      Bonjour Yannick,
      Oui je vais bien en général, et mes sinus se portent mieux !
      Voici le lien vers un ventilateur semblable, lequel contient tous les renseignements pertinents pour répondre à ta question. Mais il faudra voir ce qui est offert sur le marché français.
      Ta nouvelle Tig te “soudera” sans doute dans ton atelier plus longtemps !! Lol Amuse-toi bien.
      Au plaisir…

      Liked by 1 person

  6. Sam says:

    simple, cheap and effective


  7. Serge, I love your postings. This is an easy good idea. The main problem is that dust in a shop can plug that up in one day which becomes very expensive since the filters are so expensive.

    Liked by 1 person

    • Serge says:

      Good point Pops. First, I made mime for the house (think dust and dog). My former house was heated with a central furnace and duct system and I was missing that filtered air. When I saw the sample on TV I decided to make my own and then shared the idea and how I made mine.
      Years ago I’ve equipped my shop with a dedicated store bought air filtration box to be hung on the ceiling, which is very efficient because it has three speeds and two stage filters. The first stage captures larger dust particules while the inner one, which is kind of a deep divided pouch, captures very fine dust down to 1 micron (in my memory don’t fail!).
      Since high performance filters (MERV 13 and up) could be expensive, a solution may be using the same two filter stages mentioned above, by staking two 1″ think one each side of the four sides, one being a cheap one on the outside and a better one on the inside. Throughout the years I’ve been using the store bought one in the shop (Delta), I never had to change in expensive inner filter.
      That said, does a shop need to be filtered up to such high level filtration? In fact, I still use a good duct mark when I’m sanding and turning!
      I believe it’s a matter of ones budget and expectations!

      Liked by 1 person

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