I am looking for 4" flexible spark resistant ducts to collect dust from
my 2"x72" belt grinder.

I could use aluminum ducts but my dust collector is mobile and I am
going to move it every time I use my grinder and aluminum duct will
eventually break.

In Home Depot I found some 4" plastic flexible ducts for cloth dryer
but they are "heat resistant" not spark resistant.

Any useful info is appreciated.


Thanks,
Alex