4" vs 6" dust collection

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Forum topic by jimmy J posted 03-21-2014 12:21 PM 1263 views 0 times favorited 6 replies Add to Favorites Watch
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jimmy J

229 posts in 2372 days

03-21-2014 12:21 PM

I need to rerun much of the duct tubing in my shop. It is all 4” today, but was thinking of making some of the new main trunk at 6”. However, the main trunk will not be able to run all the way back to the vacuum at 6”. Ie, after the 4” connections from the shop machines, there will be about 20” of 6” trunk tubing before it will have to down convert to 4” to navigate the last 20” to the vacuum). Do you all think this makes sense to do, or just go with all 4”? the vaccume i am using is the HF unit.

6 replies so far

View DIYaholic's profile


19618 posts in 2668 days

#1 posted 03-21-2014 12:28 PM

Only switching out the “middle” of the runs to 6” won’t improve performance. I wouldn’t waste my time with that non-upgrade.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

View gtbuzz's profile


427 posts in 2434 days

#2 posted 03-21-2014 12:30 PM

Won’t do a thing. I’m also not sure the HF is capable of supporting 6” runs. I’d leave everything as-is.

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 1941 days

#3 posted 03-21-2014 03:32 PM

you’ve got to have serious power for 6” lines. anything under 3hp and a 14” impeller really needs 4” to perform its best.

View Fred Hargis's profile

Fred Hargis

4980 posts in 2486 days

#4 posted 03-21-2014 03:52 PM

+1 for the waste of time/effort/money.

-- Our village hasn't lost it's idiot, he was elected to congress.

View crank49's profile


4030 posts in 2964 days

#5 posted 03-21-2014 05:42 PM

The 6” section will fill up with dust over time to equal the size of the 4” connected to it. Don’t do it. The HF will work fine with a 5” pipe, or a 4” and a 3” connected at the same time.
A 4” reduces the volume somewhat, but not too bad with a short run.
A 6” reduces the velocity somewhat, but would help a long run.
Don’t run 6” pipe vertical with the HF as you may have drop-out.

edit. For what it’s worth, I add that a pair of 4” pipes would have about the same characteristics as a single 6”.

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jimmy J

229 posts in 2372 days

#6 posted 03-28-2014 05:08 PM

thanks all

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