Venting to the outside? - Woodworking Talk - Woodworkers Forum
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post #1 of 19 Old 09-22-2020, 09:56 PM Thread Starter
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Venting to the outside?

I'm looking into buying a dust collection cyclone system for my small shop. I'm stuck on whether or not to vent the system to the outside vs buying the large filter. My shop is in my basement and is heated with the homes central ducted heat pump, there are no gas burning systems in the house. I like the idea of sending all the fine particles outside; However, I'm worried about sending all my heated air from my shop and the rest of the house outside with the fines.

Is venting to the outdoors realistic for a heated shop? Does anyone have a heated and/or cooled shop that your dust collector is vented outdoors?

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post #2 of 19 Old 09-22-2020, 10:04 PM
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Quote:
Is venting to the outdoors realistic for a heated shop?
i'm gonna go out on a limb and say no
here in michigan, it would be financial suicide
even in florida on the rare day you have the heat on it would chill your house down to ambient temp fast
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post #3 of 19 Old 09-22-2020, 10:20 PM
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Sounds like you either need to buy or rig an air purifier to remove the airborne particles. If you are cramped for space you could draw the air out of the shop, through a filtration system and then put the air back in the basement. The dust collector is just for larger particles. The fine dust that is a problem will go right through the dust collector filter bag.
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post #4 of 19 Old 09-23-2020, 12:22 AM
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Im in chicago. My dust collector vents outside.

Few questions: How often are you running the shop?

How many CFM of collection? Take the rating and cut that by 65% and thats what your gonna realistically be able to flow.

If its a typical 2 to 3 HP collector, its no different then venting your kitchen stove outdoors.


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post #5 of 19 Old 09-23-2020, 06:02 AM
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I vent my dust and VOC outside from my basement, I think it is about 500cfm with a 4" dryer hoses with blast gates between the drier and shop. Works fine for me and the wife doesn't complain about the smell upstairs, keep in mind it only setup for airborne dust not individual equipment I use the shop vac for that.
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post #6 of 19 Old 09-23-2020, 07:47 AM
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Quote:
Originally Posted by Woodified View Post
...Is venting to the outdoors realistic for a heated shop?

Where are you located? That makes a difference.


Be sure you have an air inlet in your shop. You probably don't want to be trying to suck air from the rest of the house through whatever leaks you might have.


Cost depends on what kind of temperature difference you are trying to maintain. You will lose about one BTU per hour per cfm for each degree F temperature difference. For example, 68F inside and 38F outside at 500CFM is about 30x500 = 15,000 BTU/hr heat loss. At $15 per million BTU that's about $0.23 per hour. Your cost per BTU I'm sure is different, but should be in the same range.

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post #7 of 19 Old 09-23-2020, 05:30 PM
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Simple math.

1500 Square feet of house
1250 Feet per minute of dust collector
It will exchange the air volume of the houses in less than 10 minutes. That is what you are dealing with. Nothing is perfect, so make that 20 minutes. It doesn't really matter you are still going to lose the heat in the volume of air.

So build yourself a closet to fit the dust collector with good size furnace vents in the wall and door. Any un-trapped or loose dust will be in the closet. If you build a 33 gallon trash can separator, you can leave that outside the closet.

When I'm in the shop, heavy. I empty the trash can part about once a month and the fine particle bag about once a year or so.

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post #8 of 19 Old 09-23-2020, 09:33 PM Thread Starter
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Originally Posted by Steve Neul View Post
Sounds like you either need to buy or rig an air purifier to remove the airborne particles. If you are cramped for space you could draw the air out of the shop, through a filtration system and then put the air back in the basement. The dust collector is just for larger particles. The fine dust that is a problem will go right through the dust collector filter bag.
Thanks Steve. I have an air cleaner unit and a mobile cart with a shopvac with a small cyclone however I'd like something tucked in a corner of my shop so I'm not dancing around the cart, stepping over the hose, and power cable.

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post #9 of 19 Old 09-23-2020, 09:37 PM
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Thanks Steve. I have an air cleaner unit and a mobile cart with a shopvac with a small cyclone however I'd like something tucked in a corner of my shop so I'm not dancing around the cart, stepping over the hose, and power cable.
The unit will draw air regardless of where it's located. You might put the air cleaner on a shelf on the wall out of the way.
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post #10 of 19 Old 09-23-2020, 09:47 PM Thread Starter
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Where are you located? That makes a difference.
Nova Scotia. It gets cold in the winter :)

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post #11 of 19 Old 09-23-2020, 09:48 PM Thread Starter
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Originally Posted by furnacefighter15 View Post
Im in chicago. My dust collector vents outside.

Few questions: How often are you running the shop?
Mostly just on the weekends

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post #12 of 19 Old 10-02-2020, 11:19 AM
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How would you feel if your neighbour dumped raw sewage in your yard?

My guess is probably the same as they feel with you polluting the air they breathe, you may like the idea of sending the fine particles outside, I doubt they feel the same way.

Pollution is pollution, act responsibly!

Wise men speak because they have something to say; fools because they have to say something -Plato

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post #13 of 19 Old 10-03-2020, 07:07 AM
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Wow that was a little extreme, It's not like we are operating a chemical factory or a sawmill in our shops. Or should everyone install micron air filters and make their shops air tight so no VOC's escape?.
There are always fine particles in the air, it is called nature, my compost pile releases ammonia, CO2, and probably some methane. Every leaf and tree that falls in a forest, or swamp produces the same.
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post #14 of 19 Old 10-03-2020, 10:38 AM
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If those particles aren't doing any harm why blow them out of your shop in the first place?

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post #15 of 19 Old 10-03-2020, 12:07 PM
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I would like to understand this issue better.

Clearly, breathing sawdust is very harmful. Sawdust is also annoying if it gets on your things and you have to clean it up. Obviously your neighbors don't want to breathe your sawdust, nor do they want to clean off your sawdust that lands on their stuff. Obviously, if you live in an urban or suburban neighborhood where neighbors are close together, you shouldn't blow the sawdust outside your shop where it can impact your neighbors.

What if you live in a rural area where the nearest neighbor is far away and would not be directly affected by your sawdust? Is ordinary sawdust a significant environmental pollutant?
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post #16 of 19 Old 10-03-2020, 03:42 PM
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I think I get the issue here ....

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Originally Posted by FrankC View Post
If those particles aren't doing any harm why blow them out of your shop in the first place?

It has to do with particle size and concentration unless I'm all wet. The finest particles are the most harmful, especially in concentrated doses like a closed shop atmosphere. If they are large enough to see get deposited on the neighbor's Corvette, you would have a problem. If not, probably no cause for concern. My nearest neighbor is 200 ft or so away, but I still collect my dust in a DC and compost it back to "modified" earth with no "ill" effect or calls from the EPA.

Walnut dust is harmful to horses for some reason, so do not mix that with any other sawdust, especially for animal bedding.

I think if you turned out your bedroom lights and held a bright flashlight upwards, then shook the bedding on your bed you would see a constellation of dust particles in the air. So, best not make any sudden movements in the bedroom just to be safe ........lest you disturb neighbors.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #17 of 19 Old 10-03-2020, 04:39 PM
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This thread has gotten rather ridiculous.



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post #18 of 19 Old 10-03-2020, 05:50 PM
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Of course George !

But you need to have a sense of humor or it's just isn't any fun.


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This thread has gotten rather ridiculous.



George

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #19 of 19 Old 10-03-2020, 07:41 PM
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My vent is just for the very fine airborne matter, saw dust that I vacuum up gets composted, its not like raw sewage on someones lawn
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