Author Topic: Drywall Sanding + Dust Extraction  (Read 569 times)

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Offline nthlevel

  • Posts: 3
Drywall Sanding + Dust Extraction
« on: January 01, 2021, 05:48 AM »
Hi all, currently looking for solutions to dry wall sanding dust extraction. I am caught up between if i need a M class or would be fine with an L class. I was wondering if anyone had any experience whether the M class for drywall sanding makes a difference?

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Offline Alex

  • Posts: 7223
Re: Drywall Sanding + Dust Extraction
« Reply #1 on: January 01, 2021, 06:24 AM »
M or L class makes no real difference at all, they have the same filters and the same bags. They are basically the same vacs, with one difference: M class has an audible alarm when suction drops. I guess this comes in handy with drywall to some extend, because you'll lose suction very vast when using standard bags, as the fine dust clogs the pores of the bag.

What does make a difference when sanding drywall dust is an AC vac. AC stand for AutoClean and has automatic filter cleaning. You don't use standard bags in the tub of these vacs, but a plastic liner only, and the filters get cleaned by an automatic stirrer. This  makes sure you always work at full suction untill the vac has reached its capacity.

Offline nthlevel

  • Posts: 3
Re: Drywall Sanding + Dust Extraction
« Reply #2 on: January 01, 2021, 06:33 AM »
It was more the amount of particles that are not picked up and obviously how it handles the air. My aim is to reduce the amount of particles that are not picked up to make cleaning up easier and i am unable to mute the wife

Offline Alex

  • Posts: 7223
Re: Drywall Sanding + Dust Extraction
« Reply #3 on: January 01, 2021, 07:00 AM »
Well, it seems you are not getting my point.

I've been sanding plaster all day every day the last year so I got some hand-on experience here. Gypsum dust clogs your dust bags very fast, like when it is only 1/4 full. So with an L or an M vac, this is going to be expensive very quickly.

Both L and M class vacs have the exact same suction level, and both will clog at the same moment, the only difference is the M class warns you when the suction level drops below an acceptable level and you know you have to replace the bag. In this regard the M class has the slight upper hand on the L class vac because with the L vac you have to find this out for yourself. Which, I might say, is not that difficult, you'll see when it gets messy pretty quickly.

I use a Festool Mini and a Midi vac for this, both are L class vacs. To mitigate the problem with premature clogging of the bags I have added a pre-separator (cyclone) which catches a lot of the dust and makes my bags last about 5 times longer.

By the way, it is not that important how much suction the vacs have compared to each other, because they all have more than enough to do the job. The problem is, if you have too much suction, your sander will get stuck to the wall like a suction cup, and this will negatively affect your work. This is why you often have to dial the suction level of the vac down.

Also, use the proper sander for this, some sanders are much better in collecting the dust than others. The Festool ETS series are great for drywall sanding and have great DC. I often use the ETS 125 for the smaller jobs, and it works almost dustless, but for the larger jobs I use the Rotex 150, and this one creates a lot more dust the vac won't catch. And then there are of course the dedicated drywall sanders by Festool, the Planex series.

I always wear a respirator when sanding plaster or drywall.


Offline nthlevel

  • Posts: 3
Re: Drywall Sanding + Dust Extraction
« Reply #4 on: January 01, 2021, 07:19 AM »
Thanks, i never through about adding a cyclone between.

Offline Peter_C

  • Posts: 994
Re: Drywall Sanding + Dust Extraction
« Reply #5 on: January 01, 2021, 12:39 PM »
Is this for one house, or for professional use daily?

Offline afish

  • Posts: 364
Re: Drywall Sanding + Dust Extraction
« Reply #6 on: January 01, 2021, 01:21 PM »
This video does an excellent job of going over the AC vs. non AC and other features of the CT's.  It is primarily focused on the 48 but contains good info that translates across most models.