Thread: Hare & Forbes 1 micron unit on DC3

The 1 micron cartridges are about 75=85% efficient at 1 micron.
If they are not vented outside they will still eventually fill your shed up with fine dust.

Sawing makes a lot of dust and even though only a small proportion of the mass of particles is less than 5 micron the numbers of particles are still large. Total particle counts depends on how much cutting you do. If you rip old hardwood or lots of MDF then I would be more worried than if you just to the occasional crosscutting.

It terms of flow rate, the 1200 CFM will only be possible using 6" ducting and a clean filter, with 4" ducting it will be more like 6-900 CFM. 900 CFM will only be possible with a fully cleaned filter and a only a meter or 2 of 4" ducting - but this makes it harder to vent outside the shed. 600 cfm will be with medium clean filter and a few m of ducting so you can at least vent it outside the shed.

That thing will leave your small shop full of the worst dust particle size. The big lumps fall on the floor of their own accord. For your health (maybe your life?), figure out a way to exhaust that thing outside the shop.

Hi Jeff W,

I have that set up in my shed and find it works well. I have the 1200cfm unit with the pleated 1 micron filter which I purchased separately.

When I bought this unit I was, like you, just looking to reduce the amount of mess in the shed from sawdust. For that purpose I have found the DC3 to be a great success.

Over the years I have become more aware of the health issues around wood dust, and I now know I need to do more to protect my lungs.

Peter

Thanks for the advice. I cannot easily cut a 100mm + hole through my garage wall, it is brick with wood at the top. A better option might be to whack the extractor around the side of the garage (it's on wheels) then drag out the router table (also on wheels) or the table saw (sadly, no wheels but light!) then hook everything up and go for it.

This would remove the dust from the garage whilst catching most of the dust and all of the chunks and expelling all the bad stuff into the neighbors yard (I mean atmosphere) Is this what most people do?

Thanks,

Jeff

Originally Posted by jeff_w

Thanks for the advice. I cannot easily cut a 100mm + hole through my garage wall, it is brick with wood at the top. A better option might be to whack the extractor around the side of the garage (it's on wheels) then drag out the router table (also on wheels) or the table saw (sadly, no wheels but light!) then hook everything up and go for it.

That certainly is better than letting it fill the shed.

This would remove the dust from the garage whilst catching most of the dust and all of the chunks and expelling all the bad stuff into the neighbors yard (I mean atmosphere) Is this what most people do?

Most people are in the "I cannot see it, so it must not be problem" camp.

I have the table saw, jointer and thicknesser in the shed, and when in use, any one of these is connected to a Fien dust extractor in the shed and 2hp dust extractor located outside the shed door. All my machines are on home made mobile bases with 75mm wheels, to wheel into position to connect to the dust extraction system.

The machines are connected by a 2m hose 100mm ID to a Fien dust separator, and then another 100mm ID x 2m long hose from this Fien dust separator to the 2hp dust extractor.

Works well, no dust in the shed, and the dust separator collects 95% of the saw dust.

For the SCMS, I have a Festool Kapex 120 bench mounted saw because of the small bench space requirement, the accurate laser lines showing the two cut lines of the blade, and arguably the best dust extraction of any SCMS. This is connected by a 38mm ID industrial vacuum hose to a Oneida Dust Deputy (ODD) cyclone from Carbatec fitted to an empty 15 litre paint tin. The other connection of the ODD is to a standard vacuum cleaner with a 32mm ID hose. I was able to find 2 plumbing fittings and some pipe at Bunnies that allowed me to connect the 50mm ODD intake to a 32mm ID vacuum hose, after a bit of turning of one little fitting on a lathe.

Originally Posted by JillB

I have the table saw, jointer and thicknesser in the shed, and when in use, any one of these is connected to a Fien dust extractor in the shed and 2hp dust extractor located outside the shed door.

In terms of fine particles, locating your DC immediately outside an open shed door is almost certainly no different than venting inside the shed . This plan view diagram illustrates the problem.



The low pressure inside the shed will drag the fine particle cloud that the DC will generate immediately outside the door. The DC should be located as far as possible away from any major openings, preferably on the wall opposite the open doorway. The diagram below shows my setup - this is a side view.

Ouch

Thanks BobL, your comments make a lot of sense and thanks for posting the diagrams

Originally Posted by JillB

Ouch

Thanks BobL, your comments make a lot of sense and thanks for posting the diagrams

No worries. Someday I'll put all my diagrams all together so I don't have to repeat myself.