Thread: Dust extraction in my new workshop

Bob - I've added your write up in the sticky that Groggy created.

Thanks for all your efforts.


Andy

Originally Posted by groeneaj

Bob - I've added your write up in the sticky that Groggy created.

Thanks for all your efforts.


Andy

OK thanks I wasn't thinking straight and thought the mods had to do it.

Originally Posted by groeneaj

Thanks Bob. I do intend to use 6" ducting and somehow modify my ports to suit.

Can anyone give me some advice on room air filters? Because I have high ceilings (almost 3 metres) would I have to build something to bring it lower to the floor?

Thanks

f you were to use a CVMAX and have a spare outlet open you would not need a room air filter a the one unit would do both jobs.

Originally Posted by groeneaj

Bob - I've added your write up in the sticky that Groggy created.

Thanks for all your efforts.


Andy

Well done Andy.

Originally Posted by shedman

f you were to use a CVMAX and have a spare outlet open you would not need a room air filter a the one unit would do both jobs.

It depends what the room air filter is used for.
If it is just to remove high levels of wood dust from inside a shed then I agree that a decent airflow such as generated by a large capacity dust extractor is the way to go.

If the aim is to generate a low overall dust level inside a shed, for example for finishing, then if the DC is located or vents outside a shed the make up air has to come from somewhere and that is from outside the shed. This air will always have dust in it - sometimes lots of it, and venting it back outside a shed does nothing except drag more dust in from outside the shed.

To reduce the overall level of dust inside a shed there will be a need to capture all dust from the incoming air and any residual dust inside the shed.
Running DCs that vent inside the shed means they will need to to be fitted with fine filters to capture the fine dust as will a room air filter.

In both cases (either a DC or a room air filter) one is left with the uncertainty of leaks.
DCs are used as primary dust collector so they already contain a lot of dust hence leaks can dump a lot of dust back into a shed.
Room air filters are not used as primary duct collectors so even if they leak they will not usually be as much of a problem.

The optimum way to use a room air filter is before using it to use a high capacity DC to rapidly clear the shed of high levels of wood dust and then to turn off the DC and seal the shed, and then run the room air filter to scrub the shed of the remaining dust and then leave it running while the finish dries. The other advantage of a room air filter is that it should be able to grab the dust in a much quieter manner and with less power than a DC.

Thanks Bob for your reply once again.

As my new workshop will be closed I really want to make dust control a priority. I'm pretty much set on the Clearvue CV1800 (I just need to sell some more chopping boards!).

I'll be looking to install it inside in the corner of my workshop in a soundproof enclosure. Now my questions:

1. I'm thinking of adding a pleated filter similar to this one - Pleated Air Filters
How big and where abouts does it need to be located in order to get sufficient air flow?

2. Could someone please explain exactly what "venting to the outside" actually means. I got an idea but if anyone has pics etc that explains it a bit better that would be great.

Thanks

Andy

Originally Posted by groeneaj

Thanks Bob for your reply once again.

As my new workshop will be closed I really want to make dust control a priority. I'm pretty much set on the Clearvue CV1800 (I just need to sell some more chopping boards!).

I'll be looking to install it inside in the corner of my workshop in a soundproof enclosure. Now my questions:

1. I'm thinking of adding a pleated filter similar to this one - Pleated Air Filters
How big and where abouts does it need to be located in order to get sufficient air flow?

You don't need filters if you can vent outside.

2. Could someone please explain exactly what "venting to the outside" actually means. I got an idea but if anyone has pics etc that explains it a bit better that would be great.

It means making a free flowing connection between the enclosure and the outside of the shed.
The easiest way would be to make a hole in the wall between the enclosure and the outside of the shed.

Or if you are near a window or other opening you can do something like Zelk did back in 2009.
His DC is in the enclosure on the left side of the picture and he vents the enclosure to the outside via those 2 6" hoses.

Be a bit careful when venting out side with the noise. Run mine before finishing it and a got a complaint.

Russell

Thanks Bob. I'm probably unlikely to vent outside, more curious if anything. If it's enclosed, how big would the vent/filter have to be to allow for adequate airflow. Cheers.

Here is my CV 1800. The 6M of silver insulated HVAC duct connects the exhaust from the cyclone to the outside world.
IMAG0022.jpg

No filters ... no soundproofed cupboard. Just as I like it.

The noise level outside 3M from the end of the exhaust duct is about the same as inside ... 65dB.

Cheers John for the pictures.

Whenever I see Clearvue DE's online they seem to have a lot of shop made fittings. I understand the filter is an optional accessory, but they never look like they do on the website pictures?

John
Great photos of your setup very good info in them but still some questions
Do you get any interference on a nearby radio from your DE?
What is the diameter of your silver insulated HVAC?
The sound insulation on the blower housing is?

Thanks
Russell

Rusel,

Full details of my sound suppression can be found at https://www.woodworkforums.com/f200/s...52/index3.html Essentially, it is an 8 inch insulated HVAC duct inside a 12 insulated HVAC inch duct.

The insulation on the blower is roof flashing called SureForm holding some polyester fibre in place. Details are at the same thread as above.

I have a radio in my shop and am getting no interference at all. None of our TV's and etc are affected at all. Sorry, can't help you there ... never had the problem.

Originally Posted by groeneaj

Thanks Bob. I'm probably unlikely to vent outside, more curious if anything. If it's enclosed, how big would the vent/filter have to be to allow for adequate airflow. Cheers.

The bigger the better as it will then have a slow air speed.
I recommend double the cross sectional area of the inlet as a minimum.
Mine has an cross section that is nearly 6 times the inlet.
One disadvantage of making it too big is that it may be harder to prevent sound escaping so a suitable muffler is needed.
You can see how I did mine here https://www.woodworkforums.com/f245/b...70/index9.html but if you have a cyclone then I would just use a muffler as per John Samuel's method