Thread: Enclosed workshed with an extractor: external vent with no filter bag?

still learning myself but with 1.9 headroom... can you place machines around edge of space and run 150mm pipework under benches rather than overhead... maybe I need another glass of red

Problem is the dust will still be vented internally in the space because the bags don't filter the really nasty stuff....

RE: Venting straight outside
It depends how big your back yard is and how close your neighbours are..
If it's anything less than a couple of acres it will be way messier than you think.

Some extra information:

- I have a beard. It is going nowhere.
- Normal suburban backyard, expecting to vent ~4-6 feet off the ground, in direction of venting 70 foot to neighbour's fence. Closest neighbour to the side would be 20 feet.
- Expected usage: A few hours on a weekend or so, most of which will involve me looking at a diagram and trying to figure out why it made so much sense before and now looks like it was designed by a stunned orang-utan.

What about exhausting into a drum or something? Most of it would stay in there, some would come out I imagine? If its raining (hah! What's rain?), I wouldn't bother and just exhaust into the air.

I had a detailed post all written up and lost it so this is a condensed version. As I understand things your plan is going to, as Bob said, leak dust through the lower bags into the shop area, not catch much in the lower bags because it is easier for the air to go out the pipes, carrying the dust and chips with it, blowing all over the yard. Your neighbours are going to see the clouds of dust and get really choked with you.

I think you need a cyclone separator to remove all the dust and chips and then through a baffled box exhaust to the outside. You have a dirt area that you can dig deeper to accommodate the cyclone and collection barrel, maybe lining it with bricks and pavers or treated lumber, if your termites are not too hungry. You can either build the cyclone yourself (see Bill Pentz's site below) or buy one (check with Clear Vue to see if they will sell just the cyclone). The Pentz cyclone is one of the most efficient designs you can get and the Clear Vue's are licensed to build and sell the design commercially. If you don't feel confident making one a sheet metal fabricator can from the plans. If after digging you are still shy of headroom you can tilt the cyclone over at the expense of some space but that shouldn't matter much in the dirt area. Then you'll have happy neighbours, clean yard except where you chose to put the sawdust, breath cleaner air and have a tidy shop.

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Pete

Morning all:

Thanks for the replies. Ok, straight venting is not a good idea, got it. So it looks like I'm bac k to the filter + bag which I can do, but is obviously going to involve a lot more work. I'm assuming the cupboard for this doesn't need to be airtight, just reasonably sealed? I suppose I could even get a couple of those catridges instead of bags and that'd reduce the headroom as well....

Why can'y you put the whole DC outside?
If you are going to get a 3HP DC that will be a two bag (2 filters and 2 collector bags( unit anyway so adding the extra bit for the motor will not take up much space.
The reason for making externally located DC enclosures reasonably air tight is to reduce noise. The air is then arranged to escape through a muffler or baffle box.
If noise is not an issue then a simple weather proof cover is all that is needed.

Cartridges will help increase air flow and increase times needed between filter cleaning.

THere's three sides available:
- East is basically the neighbour's property.
- South is a rose garden and is just about the one dang thing we can get to successfully grow.
- West is under the deck. The deck has probably 170 - 180 cm underneath it (and the ground is sloped) so a 190cm DC would have squashed top bags underneath it and not be terribly level. WOuld this be an issue?

Originally Posted by TheCrazedLog

THere's three sides available:
- East is basically the neighbour's property.
- South is a rose garden and is just about the one dang thing we can get to successfully grow.
- West is under the deck. The deck has probably 170 - 180 cm underneath it (and the ground is sloped) so a 190cm DC would have squashed top bags underneath it and not be terribly level. WOuld this be an issue?

Ideally you don't want the filter bags touching anything as this tends to eventually wear holes in them.
The bags could also be shortened by 200 mm with a minor loss of flow.
The other option is to reduce the size of the collection bags by 200 mm

Does rain get to that part of the under deck. If not want about digging out a flat recess that is say 200mm deep and pave it with a few of slabs?

Regrettably it is concreted. I've dug at concrete once before, never again

The unit I was thinking of getting was this one: https://www.timbecon.com.au/extracti...dust-extractor (or one of the innumerable clones thereof). I can't see that lopping off the bottom would help overall given the inlet is down there. I imagine that 20-30 cm off the top of the bags could easily be handled (I can't remember the exact headroom available and it depends on orientation. Maybe I'll take some photos in the morning.... ). Putting it out here would lengthen the run: I'd be looking at perhaps 6 - 7 metres of piping all up?

Given that I'm going to be running just the one tool at a time, I would imagine that the 3HP is going to easily handle a single tool operating at a time even at this length and the shortening of the bags. DOes that seem about right?

Originally Posted by TheCrazedLog

Regrettably it is concreted. I've dug at concrete once before, never again

The unit I was thinking of getting was this one: https://www.timbecon.com.au/extracti...dust-extractor (or one of the innumerable clones thereof). I can't see that lopping off the bottom would help overall given the inlet is down there. I imagine that 20-30 cm off the top of the bags could easily be handled (I can't remember the exact headroom available and it depends on orientation. Maybe I'll take some photos in the morning.... ). Putting it out here would lengthen the run: I'd be looking at perhaps 6 - 7 metres of piping all up?

The Hare and Forbes unit says it is 30 mm shorter plus if you take the wheels off you might sneak it under 1900?

This is similar to mine and I was easily able to lower the whole thing on mine to sneak it under the 2400 height requirement.
https://www.timbecon.com.au/extracti...dust-extractor

Given that I'm going to be running just the one tool at a time, I would imagine that the 3HP is going to easily handle a single tool operating at a time even at this length and the shortening of the bags. DOes that seem about right?

It should be OK

Get a big fridge box and keep the DC in that. Make some cardboard "tubes" to vent the "fridge" fumes outside

Originally Posted by woodPixel

Get a big fridge box and keep the DC in that. Make some cardboard "tubes" to vent the "fridge" fumes outside

The problem is given how little I drink (very little) I get tipsy off the fumes of a wet rag. Almost literally. Get me anywhere near those fumes and I'll be off with the fairies

Lets say I go with the DC-7 unit. Under the deck is largely sheltered from the rain unless its a particularly bad one but it can get a bit of sun. Any idea on the long term effect of this environment? Or is it worth getting a bike cover or a tarp and leaving that over it?

Originally Posted by TheCrazedLog

The problem is given how little I drink (very little) I get tipsy off the fumes of a wet rag. Almost literally. Get me anywhere near those fumes and I'll be off with the fairies

Lets say I go with the DC-7 unit. Under the deck is largely sheltered from the rain unless its a particularly bad one but it can get a bit of sun. Any idea on the long term effect of this environment? Or is it worth getting a bike cover or a tarp and leaving that over it?

I'd say just hang a tarp in front of it.