Reduce first or later

[Chris Puttick]

Hi all

Having acquired an extraction machine (iTech DC001S) to squeeze into the shed, on installation I realise the only way it will fit (and still allow access to the on/off switches) means the extraction inlet has to connect directly to a 90 degree bend. This will bring the pipe out from behind the machine to where it can be routed to the machines. The fitting the extractor was supplied with is 0 degree and y-shaped - more or less immediately dividing into 2 100mm outlets. My instinct is I would be better off (least airflow inhibition) by taping a 125mm 90 degree to the inlet before reducing to 100mm - but it might be easier (and take less horizontal space) if I went with an immediate reduction to 100mm and then using a 100mm 90 degree duct.

Related question: does anyone know of a remote switch option that would work with this extractor? Then I could turn the extractor around and just use the fitting it came with...

 

[Terry - Somerset]

Would it be possible to rotate the motor slightly (45-90 degrees??) an re-fix to the base by drilling new mounting holes.

This could avoid a 90 bend which I assume could disrupt airflow.

 

[Jake]

Is that an NVR switch? If not, then I run my extractor from a dedicated socket powered through shower pull-cord switch. The switch is mounted horizontally on an overhead joist, cord replaced with a long bit of plastic twine which runs through screw-eyes into the other overhead joists the width of the workshop past all the machines. A yank on the twine turns the extractor on and off. About the one advantage of a just over head height cellar workshop.

But any NVR would need to be bypassed to make something similar possible.

 

[Chris Puttick]

Would it be possible to rotate the motor slightly (45-90 degrees??) an re-fix to the base by drilling new mounting holes.

This could avoid a 90 bend which I assume could disrupt airflow.

Definitely a thought though the existing base mounting holes are captive nut, which is kinda nice; would probably need a new hose for the outlet -> collector as well

 

[Chris Puttick]

I think it's an NVR but can test

 

[Fitzroy]

Hi all

Having acquired an extraction machine (iTech DC001S) to squeeze into the shed, on installation I realise the only way it will fit (and still allow access to the on/off switches) means the extraction inlet has to connect directly to a 90 degree bend. This will bring the pipe out from behind the machine to where it can be routed to the machines. The fitting the extractor was supplied with is 0 degree and y-shaped - more or less immediately dividing into 2 100mm outlets. My instinct is I would be better off (least airflow inhibition) by taping a 125mm 90 degree to the inlet before reducing to 100mm - but it might be easier (and take less horizontal space) if I went with an immediate reduction to 100mm and then using a 100mm 90 degree duct.

Related question: does anyone know of a remote switch option that would work with this extractor? Then I could turn the extractor around and just use the fitting it came with...

From a purely theoretical viewpoint the pressure will be lowest closer to the unit so velocity will be the highest, pressure drop is proportional to velocity squared so you want larger diameters close to the unit. Reduction 100mm immediately will reduce performance more than the 125mm option. If you will in reality notice any difference is another question.

 

[deema]

Well, what about sticking it outside under a lean to roof?
The bend should be as far away as possible from the extractor.

 

[ChaiLatte]

There seems to be a picture of the machine here:

https://www.scosarg.com/itech-dc001s-1-bag-dust-extractor

It is always worth putting one in your post as seeing the item will give people ideas to solve your problem.

The Y-shape connects to a circular (blue) cover plate secured by 12 screws. You could undo those screws, rotate in increments of 30 degrees and re-secure. If you chose 90 degrees of rotation, so the legs of the Y are vertical, that might allow you to use a swept 45 degree bend on each leg of the Y to achieve the 90 degrees you say you require.

The more gradual the bend, the lesser disruption to the airflow.

The base is thin enough that you can drill right thourhg and use a normal nut on the underside to secure any revised motor position.

It it were mine, I would disconnect both the motor and the dust bag from the wheeled base, position both in their optimum position and then work out how to reattach to a mobile base (perhaps using a plywood sub-base). These items are not priceless antiques: you can modify them to suit your requirements.

 

[Sideways]

You have a machine with a 125mm inlet, choke it down to 100mm and that's only 65% of the cross sectional area. Resistance to airflow goes up as the pipes get smaller and HVLP fans make little enough suction to overcome it.
I hazard you might only achive half the cfm that they advertise for that machine in practice. Do everything you can to keep to smooth wall 125mm duct and gentle bends as far as possible. Minimise the length of any flexible hose.