Hi – new here,
Wondering if anyone has tried using kitchen extractor style rectangular ducting for dust extraction? I have a low ceiling in my workshop and don't want to have large round ducts hung from it, and I had a scrap of rectangular PVC ducting (204x60mm) left over from my kitchen refurb that got me thinking. This ducting is available from Screwfix (and also no doubt others) and is designed to have a similar cross-sectional area to 5" ducting (12,240 mm^2 versus 12,272 for the 5" round). The main drawbacks I can see are the lack of available fittings and adapters (though being rectangular you could make them from sheet materials fairly easily), and the fact that some of them have quite sharp corners that would create more backpressure than a nice smooth fitting for round ducting, but I think it should still work. My fluid dynamics knowledge is a bit rusty but I think the shape will have more skin friction than a round duct, reducing its effective size, perhaps to be comparable to a 4" round duct.
Anyone tried, any drawbacks I haven't considered? I'd probably just run the rectangular across the ceiling and then maybe have some round on the wall.
Thanks,
Hugo
p.s. I'm well aware of PVC ducting electrostatic considerations, let's not discuss them again in this thread.
Wondering if anyone has tried using kitchen extractor style rectangular ducting for dust extraction? I have a low ceiling in my workshop and don't want to have large round ducts hung from it, and I had a scrap of rectangular PVC ducting (204x60mm) left over from my kitchen refurb that got me thinking. This ducting is available from Screwfix (and also no doubt others) and is designed to have a similar cross-sectional area to 5" ducting (12,240 mm^2 versus 12,272 for the 5" round). The main drawbacks I can see are the lack of available fittings and adapters (though being rectangular you could make them from sheet materials fairly easily), and the fact that some of them have quite sharp corners that would create more backpressure than a nice smooth fitting for round ducting, but I think it should still work. My fluid dynamics knowledge is a bit rusty but I think the shape will have more skin friction than a round duct, reducing its effective size, perhaps to be comparable to a 4" round duct.
Anyone tried, any drawbacks I haven't considered? I'd probably just run the rectangular across the ceiling and then maybe have some round on the wall.
Thanks,
Hugo
p.s. I'm well aware of PVC ducting electrostatic considerations, let's not discuss them again in this thread.