Best Dust Extraction System

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https://www.ductstore.co.uk/acatalog/Bell-Mouths.html
150mm smallest.
First site I tried. They can't be that rare.
For smaller hoses, they make 'em for car air intakes. Ebay....
Thanks, I’d found that one already, but it’s not a smoothed rounded bellmouth, which I think is the whole point of trying to achieve maximum efficiency of airflow. I’m looking for around 140 / 150mm, ideally plastic as in the example above.
 
Speaker ports are the right shape but hard to find in 150mm/6". 100mm/4" more common. Companies that sell parts to audiophiles carry them along with online sellers like Amazon, and the ones in China. I have not tried one so can't say how durable they will be.

https://www.parts-express.com/speak...rdware-speaker-grill-cloth/speaker-port-tubes

If you have a lathe you can make a form and use a heat gun to warm PVC enough to use the tailstock to force the PVC drain pipe over the form to shape it.

Pete
 
Speaker ports are the right shape but hard to find in 150mm/6". 100mm/4" more common. Companies that sell parts to audiophiles carry them along with online sellers like Amazon, and the ones in China. I have not tried one so can't say how durable they will be.

https://www.parts-express.com/speak...rdware-speaker-grill-cloth/speaker-port-tubes

If you have a lathe you can make a form and use a heat gun to warm PVC enough to use the tailstock to force the PVC drain pipe over the form to shape it.

Pete
Thanks, those suggestions look promising.
 

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