Thread: Air extractor question

Thank you for your valuable advice. Once again I have been trying to think of viable alternatives given the restrictions I am facing.

I have attached a diagram of a new thought. Could the DC be located outside the shed to the left of the sliding door if I build a blue board enclosure to wheel the DC into or even leave it permanently in a sealed enclosure. I could place a roof over the DC enclosure. Either the dust would blow out into the trees and hedge or I could seal it totally with 4 walls to contain the dust in the enclosure. But would some air outlet be needed from this sealed unit to cool the DC? This would mean that I could get away with 3 - 4 metres of ducting pipe.

At the other end of the shed (inside) I could mount an exhaust fan and run a short piece of ducting pipe from it through the wall of the shed to blow any floating dust out the back of the shed. Although there would be a strong airflow through the sliding doors of the shed to the back of the shed, the DC would be in a totally sealed unit just outside.

Would this be a practical solution to remove dust?


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If you just build a wall near the door the air path length (ie red line) will be no different to putting it where the swings/slides are i.e. Blue line.
What you need is the greatest possible path length ie green line - but I'm sure you understand that already.
You could enclose just the bag and filter in a box (magenta box) but for noise reduction purposes I would suggest enclosing the whole DC.
Now - once you have the whole thing in a box this needs venting but now you can use larger pipe that will effectively have no resistance (magenta line) - something like 150 - 300 mm diam floppy foil wire wound air-conditioning ducting is ideal and run that ducting down the side of the shed to the back.
If you are going to put a hole in the end of the shed anyway I would locate the DC enclosure as shown where the blue box is and just vent thru the side of the shed.
I realize this consumes valuable shed real estate so locating the DC anywhere outside the shed is what you are chasing.

Thanks Bob.

I can't locate the DC inside the shed as there is absolutely no room left.

I can build a sealed blue board enclosure just outside the shed as indicated in the drawing with silicone sealing around the sides and roof. That should reduce the noise and also allow the DC to be left outside permanently. I could even sound insulate it. By putting it outside permanently I gain another 1m3 of free space. I can run the ducting pipe to the DC through the left side wall at the bottom and seal around that. A rubber sealed door can be placed on the front to allow access to the DC power switch and cleaning the filter bag.

I noticed the magenta coloured ducting you drew in. If I vent the sealed DC enclosure at the bottom (or top?) through this and run a ducting pipe to the back of the shed as indicated in your drawing, would I need to put some sort of pump on this duct to clear the dust or just allow it simply to be an escape duct?

It seems I am getting to a solution with your assistance.

Thanks very much.

Greg

Originally Posted by plantagenon

I can't locate the DC inside the shed as there is absolutely no room left.

I guessed that would be teh case.

I can build a sealed blue board enclosure just outside the shed as indicated in the drawing with silicone sealing around the sides and roof. That should reduce the noise and also allow the DC to be left outside permanently. I could even sound insulate it.

I don't think a 1HP unit will need sound insulation. When I place mine outside I clad the enclosure in clear acrylic corrugated sheet and even that stopped a surprising amount of noise - I do however think that the blue board will be much better.

By putting it outside permanently I gain another 1m3 of free space. I can run the ducting pipe to the DC through the left side wall at the bottom and seal around that. A rubber sealed door can be placed on the front to allow access to the DC power switch and cleaning the filter bag.

All good.

I noticed the magenta coloured ducting you drew in. If I vent the sealed DC enclosure at the bottom (or top?) through this and run a ducting pipe to the back of the shed as indicated in your drawing, would I need to put some sort of pump on this duct to clear the dust or just allow it simply to be an escape duct?

If the escape duct is big enough you won't need a pump - I'd use 9" dian air conditioning ducting.

Thanks very much Bob

I will post some photos in a month or so when I get it done.

Regards

Greg