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135 Re: Dust Collection




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This article is from the Woodworking FAQ Collection 2, by multiple authors.

135 Re: Dust Collection

From: jrdailey@cbnewse.att.com (j.rex.dailey)
Date: 1 Mar 91 20:02:32 GMT

In article <21752@as0c.sei.cmu.edu>, nhw@sei.cmu.edu (Nelson Weiderman) writes:
>
> Does anyone have any experience or opinion
> about using the central vacuum system of a
> house for the purpose of dust collection
> in a workshop? Are they generally powerful
> enough? Are there any drawbacks to be aware
> of? Are central vacs basically the same
> animal as dust collectors?
>
A few years ago I bought a new house and during the construction phase put
in a home central vacuum system. These normally use plastic pipe that
runs throughout the house. When chosing the vacuum system to "fit" the size
house I bought, I found out that a central vac system rates very high in static
pressure (mine is rated at 110 inches of water lift) with relatively low
air flow (110 cfm). This creates plenty of suction at the end of your vacuum
hose while not much cfm is required to carry the dust to the dust collection
unit.

Conversly, you want your woodworking dust collection system to be designed
to do just the opposite. You need vast amounts of cfm (mine is rated at
1100 cfm) to carry the heavier woodworking dust and planer shavings to the
collection unit. You don't need the suction because the cfm will pull the
dust into the hose due to the close proximity of the pickup hood to the
dust source. I built a small room in the garage where I vent the ductwork
to and I have my dust collection unit on a 55 gal. drum in this room. I
return the "clean" air back into the basement because it is air that has
been dehumidified.

One word of CAUTION!!!! I used metal ductwork for my woodworking dust
collection system because of the articles I read about dust explosions when
using plastic pipe (for woodworking systems only). I have read that you can
use plastic pipe, but it must be properly grounded. I didn't want to take
any chances. Most of the articles I have read about dust collection systems
have been from past issues of Fine Woodworking magazines and books.




 

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