Brand: Chump Tools
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Chump Tools has launched CHUMPround, a tool built specifically for cutting round holes in plasterboard for extractor fans and ceiling vents. It's a narrow but genuinely common trade problem: fitting a bathroom extractor fan, kitchen ducting outlet or loft ventilation grille means cutting a precise circle into plasterboard, and the usual options — jigsaw, hole saw, or a marked-out cut with a knife — all have failure modes that show up as a poor fit or a ragged edge once the fan bezel goes on.
Why circular cuts in plasterboard are harder than they look
A jigsaw can wander off the line on a curve, especially in a ceiling position where you're working overhead and can't see the blade clearly. A standard hole saw is fast and accurate but is fixed to whatever diameter the saw is, so if the fan spec calls for a size you don't have in your kit, you're stuck improvising. Plasterboard itself is also unforgiving of blowout — the paper face tears if the cut isn't clean, and a torn edge is visible once the fan or vent is fitted, particularly on a painted ceiling where any gap around the fitting draws the eye.
A dedicated circle-cutting guide addresses this by giving the tool a fixed, adjustable pivot point and cutting edge, so the operator scores or cuts a true circle at a chosen diameter rather than freehand-guiding a blade around a pencil line. The practical benefit is a cleaner edge, a repeatable diameter across multiple fittings on the same job, and less reliance on a specific hole saw size being in the van.
Where this fits on site
The clearest use case is extractor fan fitting — bathrooms and en-suites where a ceiling-mounted fan needs a clean circular opening — and ceiling or wall vents for mechanical ventilation and heat recovery systems, where the number of individual vent cuts on a single job can run into double figures. For anyone doing several fan or vent fits a month, a dedicated cutting jig reduces both the time spent per cut and the rate of a re-do because a hole came out oversized or ragged.
As with any single-purpose site tool, the case for buying one comes down to frequency of use: an electrician or ventilation installer doing this weekly gets the tool paid back quickly in reduced redo time, while a general builder doing the occasional fan fit may still be better served by a good hole saw set.
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