How Loud Is a Snow Blower? Only a Declared Figure Exists

Directive 2000/14/EC divides outdoor equipment into machines with permissible noise limits and machines subject to noise marking only. Snow-removing machines with rotating tools — self-propelled, excluding attachments — are in the marking-only group, defined in Annex I item 51, with the measurement method in Annex III Part B.

That means a guaranteed sound power level must be determined and marked. It is a real obligation and the marked value is a guarantee rather than a claim, but it is not capped, so two compliant machines can differ substantially.

The categorisation also tells you something about how regulators saw this equipment: seasonal, intermittent and not worth a ceiling, unlike lawnmowers and compressors which got both.

We searched for a measured level from a government agency, a standards body or a peer-reviewed study, with a stated distance and weighting. The FHWA construction noise inventory, which does publish measured maxima at 50 feet for dozens of machines, has no entry for snow-removal equipment. The NIOSH power tools database covers powered hand tools used in construction, not garden or driveway machinery.

Consumer publications do quote figures. They generally do not state the microphone distance, the weighting, or whether the figure is a declaration copied from a machine plate, which makes them unusable as evidence here.

So the gap is real, and this page records it instead of closing it with a plausible range. That is the same rule applied to every other page in this library.

Single-stage and two-stage machines are different acoustic sources. A single-stage auger contacts the pavement and throws snow in one action; a two-stage machine has an auger and a separate impeller, adding a rotating source and usually more power.

The engine dominates on petrol machines, and a battery or corded electric machine removes that source entirely. Then there is the snow: dry powder, wet slush and compacted plough ridge load the machine completely differently, and hitting gravel or a kerb produces impulsive noise no declared figure covers.

Finally, the surroundings. Clearing a driveway between two houses in winter, with hard frozen surfaces and no foliage, gives more reflection than the same machine in an open yard.

Snow clearing happens early, often before dawn, and that is what generates complaints. Local rules for this equipment are typically written as permitted hours or seasonal exemptions rather than as decibel limits at a boundary.

If your concern is your neighbours, the levers that matter are the time you start, how long you run, and how close to windows you work — none of which a decibel figure would help you with.

Comparisons work: engine at full throttle against idle, augers engaged against disengaged, clearing wet snow against dry. Those are the differences you can actually act on.

Uncalibrated, our meter reports an A-weighted digital signal level in dBFS — relative to digital full scale, not sound pressure. Cold and wind both interfere outdoors, and wind noise across an unshielded microphone can dominate the reading entirely, so shelter the device and treat a windy-day figure with suspicion.