Thread: Venting dust straight out of the shed

Originally Posted by Uncle Henry

My shed is freestanding and my intention was to build an enclosure outside the shed for the extractor. As we are on a bit of land, this makes me wonder if I couldn't just mount the impeller inside and blow the dust straight outside? It wouldn't cause a problem to anyone as it won't blow into a neighbours yard and it's where I currently dump the sawdust anyway (the chickens scratch around in it and spread it around).

When you say a "bit" of land what do you mean? and are your neighbours down wind of your shed ?

It's no different to using an exhaust fan and should work OK except on still days when you will probably end up sucking some fine dust back into the shed.
Make sure you orient the fresh air intakes and exit with the direction of prevailing winds.

The main difference with this idea and using a cyclone or filter bag to pre-collect most of the dust is that you neighbours will see lots of visible dust being emitted and might complain even though no dust is reaching them. When a cyclone or filter bag is used to collect most of the dust the fine dust that is still emitted is invisible so the neighbours won't see it.

Originally Posted by Uncle Henry

I'm just starting on the dust extraction journey so apologies for any stupid questions.

I've been looking for a 2hp dusty 2nd hand (like most people I am on a limited budget unfortunately).

My shed is freestanding and my intention was to build an enclosure outside the shed for the extractor. As we are on a bit of land, this makes me wonder if I couldn't just mount the impeller inside and blow the dust straight outside? It wouldn't cause a problem to anyone as it won't blow into a neighbours yard and it's where I currently dump the sawdust anyway (the chickens scratch around in it and spread it around).



Next problem will be that my table saw and thicknesser/planer do not have dust extraction ports but I'll make a separate post with pictures of those when I get a moment.

You'll end up with a volume of sawdust that sooner or later will need to be dealt with. I would suggest a two-stage system such as a Super Dust Deptuty or Thein baffle to collect 95% in a garbage can.

Be aware that venting outside will also suck your heat out.

T

Originally Posted by Teardropper

You'll end up with a volume of sawdust that sooner or later will need to be dealt with. I would suggest a two-stage system such as a Super Dust Deptuty or Thein baffle to collect 95% in a garbage can.

I wouldn't recommend using these as he only has a 2HP blower to play with and they will both constrain flow.
He doesn't have to worry about dealing with the saw dust as he is venting straight into a chook yard.
If he wanted to constrain it a bit he could locate a short duct or simple deflector to direct/deflect it downwards

Be aware that venting outside will also suck your heat out.

Here in Oz we're usually more concerned about losing the coolth

I have been blowing my dust out for years.
I live on a hobby farm, closest neighbour 1 kilometre.
My work shop is an old barn with a floor at truck tray height.
The blower and duct are installed underneath and blows straight out.
It is plugged into a power point installed underneath and I use a remote to switch it on and off.
The best thing is how quiet it is compared to most of my friends noisy extractors.
Cheers
John T

We're on 1 acre.

Nearest neighbour on that side is about 200m away from the shed.

I could angle the outlet downwards. If it gathers in a pile I can just rake it out, the chickens scratch around in it when I dump it over there anyway.

Originally Posted by Uncle Henry

We're on 1 acre.

Nearest neighbour on that side is about 200m away from the shed.

I could angle the outlet downwards. If it gathers in a pile I can just rake it out, the chickens scratch around in it when I dump it over there anyway.

Sounds good.

Bury a few kitchen scraps in the pile and the chickens will rake it out for you.

Welcome to the forum Teardropper.

Uncle Henry if you get a used DC someplace you should make the mods to it from the forum sticky, even if it is a 3hp, it will move more air with the mods. If the neighbours do see the shed barfing sawdust and gripe you always make the enclosure and put the bags back on the DC then.

Pete

I've started reading through the sticky for dc mods but at almost 300 posts it's quite cluttered. It could almost do with culling down to a single how to post to make it more useful.

In the meantime, am I right in thinking that the filter makes the dc a lot less effective?
So venting straight outside or into an open barrel outside would improve performance significantly?

Depending on where I mount the DC, there could be a few metres to my thicknesser and mitre saw.

Originally Posted by Uncle Henry

I've started reading through the sticky for dc mods but at almost 300 posts it's quite cluttered. It could almost do with culling down to a single how to post to make it more useful.

Posts #8 and 21 cover the how I do it.

In the meantime, am I right in thinking that the filter makes the dc a lot less effective?
So venting straight outside or into an open barrel outside would improve performance significantly?

Yes it will be more effective.
One proviso is that you should measure the motor current with the filters off, if it is above the motor rating the motor may overheat and eventually die.

Hi UH

The impellor is the noisy bit of the DC system and DC's are noisy. What ever you decide, I suggest that the impellor should be outside the shed, unless too close to the house.

Cheers

Graeme

Originally Posted by GraemeCook

Hi UH

The impellor is the noisy bit of the DC system and DC's are noisy. What ever you decide, I suggest that the impellor should be outside the shed, unless too close to the house.

Cheers

Graeme

Make sense.

It'll be easy to mount the impeller outside with a small cover over it and vent it away from the shed or into a drum via an open pipe.