4" vs 6" dust collection

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Forum topic by jimmyhopps posted 122 days ago 573 views 0 times favorited 6 replies Add to Favorites Watch
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129 posts in 974 days

122 days ago

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


12846 posts in 1270 days

#1 posted 122 days ago

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 procratination a bad thing?

View gtbuzz's profile


339 posts in 1036 days

#2 posted 122 days ago

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

1232 posts in 543 days

#3 posted 122 days ago

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

1636 posts in 1088 days

#4 posted 122 days ago

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

-- I long for the days when Coke was a cola, and a joint was a bad place to be (Merle Haggard)

View crank49's profile


3333 posts in 1566 days

#5 posted 122 days ago

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”.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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129 posts in 974 days

#6 posted 115 days ago

thanks all

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