Hi everyone.
I have an existing dust extraction system installed in my shed that isn’t performing as well as I’d like so I’m about to upgrade it. I’ll do all the usual things like replacing elbows with sweeps and other things to minimise suction losses.

I’m also considering upgrading the ducting from the existing 100mm to 150mm but I first want to make sure this isn’t a false step. My extractor is a 1.5hp 2 stage cyclone unit with a 150mm inlet and produces a nominal 1100 cfm of airflow (please excuse the imperial units).

The maximum length of the main ducting is about 6 metres with 3 inlet points, each supporting a few machines. The biggest loads would from the table saw at 400cfm and the thicknesser at 600cfm (estimated). It’s a small hobby workshop so I would never run more than one machine at a time.

My question stated simply is, will an upgrade of the main duct from 100mm to 150mm increase the suction or decrease it?

Thanks in advance for any input.

Cheers

Andrew