American fabric filter is how big??

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Forum topic by spalted posted 01-09-2016 04:09 AM 399 views 0 times favorited 3 replies Add to Favorites Watch
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24 posts in 2413 days

01-09-2016 04:09 AM

Seems that I am not alone in being confused about dust collection. I’ve spent the last few weeks reading everything I can find about which filter to buy. I’m more confused than when I started !

I have a grizzly 1029 2hp dust collector with 30 micron bags. I have narrowed the choices down to a Wynn 35a nano or a custom American fabric filter bag. Since my shop is in the basement AFF has recommended a bag that is 50” high but 45” in diameter in order to be optimal size. Wow. I’ve never seen or heard of a bag this size. Do I really need that? I’m a one tool at a time shop. Honestly I liked the idea of a bag over a canister but the sheer size they recommend has got me back in the Wynn camp. Has anyone else bought a AFF bag with similar dimensions?

3 replies so far

View JAAune's profile


1617 posts in 1740 days

#1 posted 01-09-2016 04:32 AM

If you go with a bag, yes, you’ll need a large one if you’re looking for better filtration without sacrificing airflow. That’s why cartridge filters are usually the preferred option. A good Wynn cartridge can pack 100-150 square feet of filter media in a small package. A simple bag with equivalent surface area would have to be at least 48” diameter and 8’ tall to accomplish the same.

Bags may have a place in large shops with high ceilings and auto-shakers but I see no use for them in a small home shop.

-- See my work at and

View MadMark's profile


970 posts in 876 days

#2 posted 01-09-2016 06:09 AM sells good bags for all types of DC’s. I use a .5 micron bag ‘cause the nasty stuff is in the 5-1 micron range.


-- Madmark -

View Fred Hargis's profile

Fred Hargis

3848 posts in 1917 days

#3 posted 01-09-2016 12:32 PM

Yes I have (I think the diameter was closer to 38”), and I put it on a Penn State DC250 (2 1/2 HP and 12” impeller). Worked like a champ. That said, when I bought that bag probably 20 years ago, the filters you can get today weren’t all that available or well known… I’d probably opt for the filter if the price was at all close between the 2. AFF is really good at calculating bag sizes, they known how much air their fabric can breathe and generally what your DC requires, after that it’s just a little math to get to a recommended bag size. Even so, if you want a bag tell them what size you want…you don’t have to take their recommendation.

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

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