How big of a dust collector for a ducted system?

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Forum topic by Shane posted 08-28-2015 10:28 PM 1020 views 1 time favorited 6 replies Add to Favorites Watch
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285 posts in 1232 days

08-28-2015 10:28 PM

i want to add a fixed duct system to my shop with a dust collector. How many hp system should I get? Is 2hp enough?

6 replies so far

View Rick  Dennington's profile

Rick Dennington

5105 posts in 2616 days

#1 posted 08-29-2015 12:39 AM

Depending on how big your shop is, depends on the d.c. system you want to add….A 2 hp. d.c. is big enough in the motor department for most shops, but what you want to look at are cfm’s. For instance, my shop is a 40×50, but only 28’ x 50’ is the actual wood shop part. I have an old Delta d.c., but it has 1200 cfms….enough power to hook up to all of my machines that makes chips and dust…Just remember to go larger than you think you need, and you’ll be fine…..Take a look at my woodshop in my profile under Workshop….It might give you an idea to work with….

-- At my age, an "all--nighter" is not having to get up and pee...!!!

View Shane's profile


285 posts in 1232 days

#2 posted 08-29-2015 03:32 AM

I really like the stats on the new Delta 50-767 but it’s not out yet. 1500 cfm with a 1 micron bag. $350

View RobS888's profile


1981 posts in 1266 days

#3 posted 08-29-2015 11:31 AM

I have the Delta 50-760 and it is great, my one complaint is the 5 inch main inlet. 5 inches is too small too handle the rated 1,200 CFM of the 760. I used a meter right in front of the inlet and only got 800 CFM. I checked, but couldn’t tell if the 767 has the same size inlet, if so it might get far less than 1,500 CFM. I ended up running 2 4inch pipe systems.

-- I always suspected many gun nuts were afraid of something, just never thought popcorn was on the list.

View Fred Hargis's profile

Fred Hargis

3847 posts in 1914 days

#4 posted 08-29-2015 12:48 PM

My suggestion would a be to consider a 2HP with a 12” impeller as a starting point, The HF doesn’t meet this criteria. Don’t get too lost in the factory CFM ratings, they are about as truthful as the 6.5HP listed on your shop-vac. That said, the performance you’ll get also hinges a lot on the ductwork you install. If you get a large DC, then choke it down with ductwork you may have just as well spent your money on a smaller unit. A 2 HP can use 6” ducting to full advantage. For example, my DC (5 HP with a 14 1/4” impeller) can pull almost 1200 CFM through 6” (measured), but when I choke ti down to one of the 4” feeds, it only moves about 550 cfm (measured). (Just my opinion.)

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

View buildingmonkey's profile


242 posts in 969 days

#5 posted 09-03-2015 02:19 AM

Depends on what machines you have, or plan to get someday. Sanders take a LOT of suck, if you are getting a widebelt or even a drum sander, you probably need a 5hp with 15 or 16” impeller. Even an edge sander takes a lot of suction. Planers work well with smaller dust collectors.

-- Jim from Kansas

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Jim Finn

2390 posts in 2343 days

#6 posted 09-03-2015 11:51 AM

I have a two HP motor on my Grizzly dust collector and ran six inch metal duct to each machine. Works fine. Duct size is as important as HP is. To minimize duct airflow resistance I kept the total length of run to each machine to a minimum by running the duct along the floor against the wall for each machine. Avoided the six feet up to the ceiling from the dust collector and four feet down to each machine by running my duct this way. It took a little p[planning of equipment placement though. I put my dust collector outside my shop in an insulated (for sound control) shelter. I did not measure airflow but this system really sucks!

-- "You may have your PHD but I have my GED and my DD 214"

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