Not everyone is looking for another construction project when they want to
filter their air. For $150, they get something with known performance
characteristics and they get it now. Some people have limited time
available in the shop and might want to spend it making sawdust instead of
an air cleaner. That said, I built one from a blower my neighbor the HVAC
guy gave me, which works fine with the small exception that the blower is
going out (could be why the furnace it was in was replaced). No worry,
though....he can get me another one.
While building one could be great fun, it takes up valuable
Few homemade machines would have variable speed, timed shutoff, or a
remote control, all features that I've found useful. If they did,
they'd probably cost more to build than buying the Jet unit. Also,
many of the shop made units seem to focus on "found" blowers. Paying
for a blower changes things significantly.
$150 for a decne tair cleaner seems like a bargain compared to
building something of comparable capacity. A box fan does not have
anywhere near the air flow of a real blower, so while it may work for
your case, its never going to be as effective as the commercial unit.
OTOH if you can get a decent blower there is nothing to prevent you
from making something that would be as effective. The key is getting
a decent blower, the rest is reltively straightforward. If you can
find a used blower for free, its probably worth building your own. if
not, I would opt to buy something.
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