Canister filter or collection bag for drum sander?

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Forum topic by ryan86 posted 03-30-2015 07:32 PM 890 views 0 times favorited 5 replies Add to Favorites Watch
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14 posts in 1174 days

03-30-2015 07:32 PM

Topic tags/keywords: collection dust dust collector drum sander canister filter bag 3hp

I purchased a 37 inch grizzly drum sander. Should I get a 3hp canister filter collection system or bag system?

5 replies so far

View OSU55's profile


1673 posts in 1989 days

#1 posted 03-30-2015 08:21 PM

Whatever DC you get, one with a canister filter is the way to go, especially with a drum sander. Bags load up much quicker vs filter cannisters. It’s simple math – the pleats in the cannister filters give them more surface area vs a bag. Preferably a filter with a rating like this Wynn Nano Filter

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Fred Hargis

4986 posts in 2493 days

#2 posted 03-30-2015 08:23 PM

Drum sanders generate mountains of very fine dust. A lot (maybe ost) of it will wind up in the filter. A canister filter will take longer to load up, giving you some extra run time. It will also take longer to clean than a bag. Here’s what I would suggest (if you aren’t going to get a cyclone, most of which aren’t perfect either) Get the canister filter DC, then add a Thein separator. The separator will separate some (but likely not all) of the fine dust from the air stream before it gets to the DC.

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

View Richard H's profile

Richard H

489 posts in 1680 days

#3 posted 03-30-2015 08:54 PM

As I said in your other post on this subject you are getting a beast of a sander that will require a beast of a dust collector to keep up. The thing has four dust collection ports on it and recommends 1600 CFM at the tool according to their manual. I assume you are looking at Grizzly’s 3HP dust collectors both of which I am very dubious of their claimed CFM. They have a 12 3/4” impeller and the canister one is advertising 2300 CFM. Something doesn’t add up there from what I understand about dust collector physics.

But to your question if you are determined to go down this route I would also suggest a canister filter with a secondary separator of some sort. It’s going to have to be pretty large to handle 4 dust ports at once however.

View crank49's profile


4030 posts in 2971 days

#4 posted 03-31-2015 02:08 AM

It makes no sense to install a good properly designed canister filter and then cripple it with a Thein separator or a cyclone pre filter.
Why do people keep suggesting this?
I designed and installed all the dust control systems for a multi national foundry for 30 years and I never did this for wood dust. It’s absolutely absurd.
I just noticed your other thread on this subject and the responses there seem to be more practical.
A cyclone with exhaust outside. I would not have come up with this because my background is from a facility where i had to jump through all of EPA’s hoops. They would have castrated me for dumping particulate dust outside.
But they don’t fool with home shops or even small businesses for the most part.
A bag filter can work also, but you just need a huge bag, or a bunch of small ones.
The magic number is to try to keep the air to filter area at around 7:1 for bags and 4:1 for cartridges.
So if you have 1600CFM of air you need 228 square feet of filter cloth area for a bag filter or 400 square feet of filter area for a pleated filter cartridge.As long as you adhere to these ratios one product will work as well as the other.

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Richard H

489 posts in 1680 days

#5 posted 03-31-2015 03:21 PM


The idea at least to me is to use a Thein separator to make up at least partially for the horrible design of most of these canister type dust collectors. The separators on most of these cheaper dust collectors are little more than a metal ring with a hole at the bottom for dust to drop though and don’t work anything like a true cyclone separator. This results in way more dust getting into the bag/canister than you would see with a good cyclone design. I agree if you have a well designed cyclone system a outboard separator is both unneeded and unwise but if your going with one of the less expensive designed dust collectors like the ones the OP is asking about they make more sense.

Personally I’m done messing around with these kinds of dust collectors. My next dust collector will be a well designed cyclone. There are all kinds of things you can do to make them work better but in the end is it truly worth the time, money and energy spent on it?

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