I am wondering whether this really makes sense to build an air-cleaner
instead of just buying one ready-made. I built an air cleaner using
various design elements from different sources. It is useful in
keeping air clean. But I don't think I have saved much money. The
reason is that I didn't have a used blower available, I didn't have
suitable scrap wood to build the case, I didn't have suitable nuts and
bolts, and I didn't have a spare on/off switch with timer. This means
I ended up buying everything _new_. The cost added up.
I chose to build at that time because I didn't find an air-cleaner
that can filter down to 1-micron. Guess what -- not soon after I
finished building the air cleaner, I found that Grizzle is selling an
air cleaner that can filter down to 1-micron!
My opinion is that building an air-cleaner only makes sense if you
have specific need (need a specific filter or something), and you have
spare parts available or can be obtained in low cost.
One more thing: If you choose to build it, please build it light. I
built mine like a tank with overly beefy plywood and MDF. Now it is so
heavy that it requires two persons to lift it. Oh well...