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Two helical rotors compress the air continuously, in a chamber where oil provides sealing, cooling and lubrication. It is the workhorse of industry, and the cheapest to buy at a given flow.

The same rotors, with no oil in the chamber: dry, with timing gears, or with injected water doing the sealing. The air is Class 0 by design.

An off-centre rotor whose vanes slide and sweep the stator: a single part turns, slowly, which lasts. The same principle compresses air and, working the other way round, pulls a vacuum.

Two nested spirals, one fixed, one orbiting: the trapped volume shrinks from the rim to the centre, with no contact and no oil. Quiet, vibration-free, and limited to small flows.

Two claw-shaped rotors that never touch, held apart by timing gears. Certified Class 0, in the range that starts where the scroll stops.

The air is not trapped then squeezed: it is accelerated by an impeller at very high speed, then slowed down, and that slowing is what compresses it. Reserved for very large continuous flows.

A piston, valves, several successive passes: it is the catalogue's only route to very high pressure, up to 500 bar. Flow matters less here than the pressure reached.

A piston with no oil in the chamber, in two or three air-cooled stages: it starts from ambient air and reaches 30, 40 or 60 bar in a single machine. The alternative to a booster when no low-pressure network exists.

An air-end driven by a diesel engine instead of an electric motor: air is produced where there is no power. Site work, quarries, backup for a fixed installation.

It does not start from ambient air: it takes the network's already compressed air and pushes it higher. Only the fraction that needs it is boosted, instead of raising the whole network.

Compressor, dryer, filtration and receiver in a single frame, connected and set at the factory. One electrical supply, one air outlet, and nothing to size in between.

The air is cooled to a few degrees above zero: the water it can no longer carry condenses and leaves through the drain. Dew point +2 to +10 °C, the right level for an indoor network.

Two molecular sieve columns alternating: one dries, the other regenerates. Dew point -40 to -70 °C, for lines running outdoors and processes that need genuinely dry air.

A bundle of hollow fibres lets water vapour out faster than air. No power, no moving part, no noise: point-of-use drying, paid for in purge air.

Stages in cascade, coarse to fine: particles, oil aerosols by coalescence, then vapours adsorbed on activated carbon. The order is what makes the quality, not the fineness of the last filter.

Every low point collects water, and the drain removes it without anyone thinking about it. Float, timed or level-sensing: only the last one does not throw compressed air away.

What leaves the drains of a lubricated compressor is an oil and water emulsion, not water. Settling then adsorption bring it down to 15 mg/L of oil before discharge.

Compressed air passes through an adsorbent that holds one gas back and lets the other through, alternating between two columns. The site produces its own nitrogen or oxygen instead of having it delivered.

Selectively permeable hollow fibres separate the gases of air with no moving part. The same principle as the membrane dryer, applied here to producing nitrogen.

It absorbs demand swings, steadies the pressure and lets condensate settle. Its real effect is elsewhere: it spaces out compressor starts, and therefore wear.