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ventilated floor for dust collection?

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Forum topic by skogie1 posted 03-14-2018 11:27 AM 1488 views 0 times favorited 31 replies Add to Favorites Watch
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skogie1

119 posts in 1563 days


03-14-2018 11:27 AM

Topic tags/keywords: dust collection shop design

In the next year or two I will have the opportunity to build my dream shop. One idea I’ve been toying with is perforating some areas of the floor and drawing air through them for dust collection. Basically, I’m trying to achieve a downdraft for dust collection in an attempt to keep it funneling down and away from my breathing. I’ll of course have the usual hookups for the machines, but as a method to rid the air of floating dust this seems promising. I haven’t worked out any of the details yet. Anyone have any thoughts on this idea, positive or negative? Ever see it done or tried it yourself? Thanks in advance.


31 replies so far

View cabmaker's profile

cabmaker

1740 posts in 3008 days


#1 posted 03-14-2018 11:33 AM

I have not seen that done….Seems that that arrangement may create a vortex that you would be in the middle of

I also don’t see any reason to not use a nice cyclone system that already exists

By the same token however,,,,,thinking outside the box is what made this country great,,, I say go for it !

View Redoak49's profile

Redoak49

3662 posts in 2188 days


#2 posted 03-14-2018 11:36 AM

I think it would take a lot of cfm to do this. Better to get the dust at the source.

View RandyinFlorida's profile

RandyinFlorida

257 posts in 2267 days


#3 posted 03-14-2018 12:38 PM

I’m intrigued. I don’t think you would need all that much cfm. You are not trying to suck up (down) all the sawdust; just the fine particulates.

-- Randy in Crestview Florida, Wood Rocks!

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LittleShaver

420 posts in 819 days


#4 posted 03-14-2018 12:42 PM

Sounds fascinating. I’m picturing a floor of pegboard. Would need lots of support, but it sounds interesting. I would have to have lift out panels for recovering dropped fasteners.

-- Sawdust Maker

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dhazelton

2793 posts in 2496 days


#5 posted 03-14-2018 01:10 PM

I think of my hot air furnace’s filter – if the furnace is on while I scoop a cat litter box I can see a cloud of fine dust headed for the intake and know that it’s headed that way – when I change filters it proves the point.

SO – I think if you do this just with normal HVAC ductwork and use a furnace blower motor with squirrel cage fan you can make it work just fine, and I think it would clean the air really fast. But you’ll have to change or clean the filters often.

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eflanders

318 posts in 2050 days


#6 posted 03-14-2018 01:12 PM

I agree that it is an idea worthy of further research. IMO It would mean changing your normal air ventilation HVAC system and ducting them through the walls with filteration. Your electrical use would likely go up a lot though as you would want the system to circulate air every minute you are working and then some. If the circulation fans were hooked to a 12 volt solar generator though… A perforated floor wouldn’t be needed if you used wall ducts similar to your current fresh air intake vents in your home. Check this idea out with some HVAC folks that also do woodworking and see what they think.

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Steve

739 posts in 782 days


#7 posted 03-14-2018 01:12 PM

I feel like this would be the same principle as an air hockey table, except that the fan is blowing in reverse.

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jamsomito

304 posts in 625 days


#8 posted 03-14-2018 01:28 PM

I’m in the energy efficiency industry and I’m picturing something like a data center air conditioning system (only in reverse):

I’m assuming you’re just going to hook up a blower to a plenum-type space underneath the floor, like a crawlspace-like area. Plenums work great for return air (and sometimes even supply air), but it’s such a huge area, velocities are very low, and it reduces exponentially, radially from the source of suction. I’d worry if you’re making piles of sawdust on the floor (like me) eventually you’re going to plug that area up and reduce your flow, but maybe not. You’ll want to make sure that space is sealed really well too so you’re not just infiltrating outside air through the wall boards and losing negative pressure to draw from your space.

I’m also assuming you’re just exhausting that air straight outside. To make it work well, you’ll also have to consider your make-up air. If you’re pulling out 1000 cfm from a makeshift furnace blower setup, you’ll be pulling from cracks in the doors, windows, and siding which are all about head-height or lower, so it might not give you the draft you want. I’d put a dedicated make-up louver in the ceiling or high up on the wall to give the air an easy path right where you want it.

Keep in mind though that with the fine dust blowing off the power tools at hundreds of miles an hour, it’ll get all over the room fairly well mixed anyway, and this system won’t be much more effective than a circulating air scrubber most of us hang from the ceiling. You’ll still want to wear a respirator methinks.

These are just some thoughts off the cuff. It’s an interesting idea – definitely let us know what you decide and if yes, how it works!

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TheFridge

10714 posts in 1685 days


#9 posted 03-14-2018 01:47 PM

I’d focus on superior collection at each point instead of so-so throughout.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View shipwright's profile

shipwright

8165 posts in 2997 days


#10 posted 03-14-2018 05:12 PM

I run my big DC piping under my floor and branch pipes come to holes where my machines are located. I don’t get much fine dust from machines when the DC is on and when I sweep up I just open a few of the floor holes and turn the DC on. You can actually see the dust rising from my sweeping drift toward the nearest opening. It never rises up to my height.
You might understand my system better if you look at this blog. http://lumberjocks.com/shipwright/blog/series/5536
Segments two and three will show you the most.

-- Paul M ..............the early bird may get the worm but it’s the second mouse that gets the cheese! http://thecanadianschooloffrenchmarquetry.com/

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jimintx

855 posts in 1784 days


#11 posted 03-14-2018 05:19 PM

Given ever-increasing amathophobia, will the next solution be to install massive exhaust fans, and push so much air through the shop space that it’s a bit like working in a wind tunnel?

Why wouldn’t a wall of high volume, high velocity exhaust fans be as good or better than some sort of under-floor system?

-- Jim, Houston, TX

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jonah

1920 posts in 3498 days


#12 posted 03-14-2018 05:34 PM

Focus on superior source collection at the tools. Combine that with a downdraft table for sanding and routing. Those are two operations that create a lot of fine dust. You don’t need a downdraft throughout the shop.

View AZWoody's profile

AZWoody

1413 posts in 1423 days


#13 posted 03-14-2018 05:44 PM



Given ever-increasing amathophobia, will the next solution be to install massive exhaust fans, and push so much air through the shop space that it s a bit like working in a wind tunnel?

Why wouldn t a wall of high volume, high velocity exhaust fans be as good or better than some sort of under-floor system?

- jimintx

Why is it a phobia of dust? Do you believe that fine dust from wood has no adverse health effects on the human body?

View skogie1's profile

skogie1

119 posts in 1563 days


#14 posted 03-14-2018 05:54 PM



I run my big DC piping under my floor and branch pipes come to holes where my machines are located. I don’t get much fine dust from machines when the DC is on and when I sweep up I just open a few of the floor holes and turn the DC on. You can actually see the dust rising from my sweeping drift toward the nearest opening. It never rises up to my height.
You might understand my system better if you look at this blog. http://lumberjocks.com/shipwright/blog/series/5536
Segments two and three will show you the most.

This a lot like what I had in mind. Thanks. I’ve bookmarked your link for future reference.

- shipwright


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skogie1

119 posts in 1563 days


#15 posted 03-14-2018 05:57 PM

Thanks for the replies everyone. Given me food for thought. Just to be clear, I wasn’t thinking that this would be my main source of dust collection. I will have dedicated ports at each machine. This was just a thought on how to clear the air of the fine particulates that float around. Thanks again.

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