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Thread: Dust extraction choices
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10th March 2012, 08:56 PM #16GOLD MEMBER
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This from BP's site...
After helping hundreds configure the ducting for their shops and doing these calculations, almost all small shops need only 6” ducting and fall into one of four categories. Those with no ducting who move a 10’ flexible hose between machines end up with about 4” w.c. resistance for their systems. Those with shops sized about the same as a one-car garage with ducting end up with about 6” of resistance for their ducting. Most hobbyists have shops sized about the same as a two-car garage and end up with about 8” of resistance. Those with three-car garage sized shops have about 10” of ducting resistance. Those with larger shops must do the detailed calculations themselves. Most small shop owners should go through using that calculator to verify their shop needs. When using this calculator note that it allows you to add in other system overhead that affects our airflow and blower needs:
From here...Bill's Cyclone Dust Collection Research - Dust Collection Basics
Under the heading of "1. Resistance Calculation".CHRIS
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10th March 2012 08:56 PM # ADSGoogle Adsense Advertisement
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15th March 2012, 05:28 PM #17
Hi Jim
here is my 2 cents
if you are using large amount of mdf in your work and making lots of fine powder everyday then yes I suggest you invest in so personal protective gear.
If you are mainly using real wood on a amateur level a few hours per week then I think the risk is overstated from a health risk perspective. I am a health professional and I am yet to meet someone who suffers ill effects from breathing too mush saw dust
By all means dust extraction keeps your shed tidier but from a health perspective i think the risk is overstated by BP and others for commercial gain
Regards
Andrew
(exception here is if you are working nast exotic timbers)"All that is necessary for evil to succeed is for good men to do nothing"
(Edmund Burke 1729-1797)
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15th March 2012, 06:43 PM #18.
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Well it sounds like it's time you met someone who did - so let me introduce me.
I disagree that you have to be exposed everyday over a long period of time to be affected by MDF. I spent 3 consecutive days working with MDF outside on the back lawn and I lost my sense of smell for 6 weeks. It was deadly serious - everything tasted foul and I could not drink beer. Even after 6 weeks my sense of smell and taste was not right and it took about another 6 weeks for it to be back to normal again. It might not sound like much of a problem but let me assure you it was no fun. I have since been able to work with it OK without any problems (maybe I'm now desensitized) but I always keep a DC running in the background to keep the shed well ventilated.
The other issue is that no one knows before hand if they are allergic to specific wood dust or not. For some people all it takes is a single contact with wood dust from a specific type of wood to trigger a problem. eg look at this Silky Oak poll.
As someone that has worked with dust control since the mid 1980s, what I see are large number of woodworkers that think they have their dust emissions under control when they are so far from any control that they might as well have none and in some cases all they are doing is making things worse.
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16th March 2012, 03:04 AM #19GOLD MEMBER
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