vacuum for a drywall sander: class m is the sweet spot

why the vacuum is half the machine

A dust-free drywall sander is a system, and the sander is only one end of it. The shroud around the head captures dust at the point of cut; the hose carries it away; the vacuum is what actually holds it there. Under-spec the vacuum and the best shroud in the catalog becomes a dust distributor with extra steps — fine gypsum powder blows straight through a filter meant for sawdust, and the crew breathes what the machine was supposed to capture.

That is also why the specification question keeps coming up from buyers: the machine ships with shroud and hose as standard, and the vacuum is the part of the system they source locally. Here is the checklist that makes the pairing work.

L, M, H: what the dust classes mean

European practice grades extractors by the hazard of the dust they are built to hold: L for low-risk, M for medium-hazard, H for high-hazard (source: festool & cleva-uk dust class guides). The grades differ in filtration tightness, filter exposure and how safely the dust container opens — all three matter more as the dust gets finer and more hazardous.

Inside any class, the filter term to look for is HEPA — high-efficiency particulate air filtration, defined at ≥99.97% capture of particles down to 0.3 microns (source: festool). Gypsum dust lives exactly in that size range, which is why a fine-dust or HEPA cartridge is the difference between an extractor that holds the dust and one that exhausts it back into the room.

the features that matter with a shrouded sander

Three features separate an extractor that suits a shroud-and-hose sander from a generic workshop vacuum. First, a power take-off socket with auto-start: the sander plugs into the vacuum, and the extractor starts when the tool does — capture begins at the first second of sanding. Second, delayed shut-off: the vacuum keeps running a few seconds after the sander stops, clearing settled dust out of the hose before it compacts. Third, filter cleaning — manual tap-to-clean at minimum, automatic jet-pulse cleaning on better units — because fine drywall dust blinds a filter fast, and a blinded filter is a vacuum that no longer vacuums. A cyclonic pre-separator is the optional fourth: it spins the bulk of the dust out before the main filter and pays for itself on full-day sanding crews.

when class H is not overkill: the silica line

Class H exists for dust that damages lungs at low concentrations, and respirable crystalline silica leads that list. Sand into old plaster, concrete or masonry and the job stops being a gypsum job. The regulatory backdrop is the same one reshaping the whole category: OSHA's construction standard 29 CFR 1926.1153 and the EU's Directive (EU) 2019/1300 both cap silica exposure at 50 µg/m³ as an 8-hour average (source: osha.gov; EU-OSHA). Equipment that captures silica dust at the head — shroud, hose, H-class extractor with HEPA-type filtration — is the practical path those rules reward.

For a distributor the assortment read is simple: M-class machines for the board-and-plaster mainstream, and a knowledgeable H-class upsell for the renovation and refit trade. The rules behind that upsell are laid out in the dust-free wall sander and silica rules guide, and the machine-side class structure is in the 3-wheel vs 4-wheel wall grinder comparison.

sourcing note: complete the system

To be explicit about where the machine ends and your spec begins: Cirelto supplies the wall grinder half of the dust-free system — the 3-wheel dust-free wall grinder CI-G750 and its sibling lines ship with shroud and vacuum hose as standard equipment. The vacuum half is specified on the buyer side, and the checklist above is the spec sheet: class M with HEPA for gypsum work, class H where silica enters, power take-off with auto-start, delayed shut-off, filter cleaning. That is also a margin story — the extractor that pairs with the machine is a natural cross-sell in your own catalog, and the wholesale range is built to load alongside it in a mixed container.

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