Which is better, single wide vent or split 2 smaller

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Forum topic by WorksInTheory posted 04-26-2019 06:25 AM 388 views 0 times favorited 1 reply Add to Favorites Watch
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177 posts in 1964 days

04-26-2019 06:25 AM

Hi, a dust collection question. I am working on my miter saw dust collection and have something like a homemade Rousseau. Putting a 4 inch line in below/ back-ish.

I turn that line into a wide vent, opening 3.5” x 18”... but was wondering if it is better to have the 4” line come in and split into two 3.5” x 6” openings for example ( basically I would cut a triangle that would insert into middle of wide vent to split 2 paths.)

1 reply so far

View MikeDilday's profile


250 posts in 821 days

#1 posted 04-28-2019 12:19 PM

If you are using 4” flex then it probably won’t help air volume. If you have larger mains, say 6” or 8”, then increasing to a 6” drop, a 6” wye with two 4” connected then you would definitely increase air volume depending on your dust collector.

If you are trying to get a better position of the inlets by having two then it might help.

-- Michael Dilday, Suffolk, Va.

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