Thread: Ducting

It will, but 100mm ducting is the limitation. If you take the Wye off the extractor you'll find the port is most likely 125mm. Run larger pipe from the extractor, and put the Wye as close to the tools as you can to minimise the amount of 4" duct you use. The gurus will advise using 150mm pvc duct as much as possible.

Yes it will lift it provided the entry for air flow in the table saw cabinet allows for enough flow.
BUT
Especially with small DCs, all verticals should be installed with a Y connector at the bottom of the vertical run with the ducting connections being at the side and top of the Y.
The bottom of the Y should be a screw on cap that can be removed to clear blockages.
Also instead of the single 90º bend (as shown in this pic) use to x 45º bends to give a longer radius of curvature to right angles

The reason for this is if the DC stalls or the restrictions to air openings in the saw cabinet reduce the air speed some or all of the sawdust will fall out of suspension and restrict the bottom of the vertical.
A screw cap inspection port will enable easy clearance of this blockage.
AFter you have installed this period inspection of this cap will tell you if you need to open up the saw cabinet openings to improve the flow.

Thanks for the help. The people at Machinary warehouse tell me there is an issue with PVC pipe and static electricity causing fire. Any way round this?

PVC static generation isn't really an issue with small dust collectors - more with large commercial systems because of the much greater airflow. If you are really worried you can use gal or zinc downpipe, run an earth wire through the pipe (H&F will happily sell you a kit of copper wire for this), or aluminium tape can be used. I think you'll find most users with PVC ducting do precisely nothing about static.

Originally Posted by Kevin-R

Thanks for the help. The people at Machinary warehouse tell me there is an issue with PVC pipe and static electricity causing fire. Any way round this?

This is basically bollocks.

There have been some fires in DCs but there has not been one that has been reported due to an electrical discharge inside PVC ducting.

The Physics of charge collection on PVC pipes puts all the charge on the outside of the pipe so a discharge cannot build up or take place on the inside.

I was in at the local hardware looking at plumbing fittings, a 100mm DWV inspection bend looked to have a longer radius than the normal bend so these might also be an option, the inspection opening may be useful as well???


Pete