The invention relates to improvements in compressor units, and in particular to a modular compressor unit which has separate sections for the compressor, the controls and the air intake. The modular compressor unit comprises three separate adjoining sections, being an intake section, a compression section and a control section. The intake section comprises air intake means which provide an inlet for ambient air to be compressed and for cooling the compressor motor and comprise filters to filter air entering the intake means, noise attenuation means provided in the air intake means, and means for directing air to components in the compression section. The compression section comprises a compressor, a motor arranged to drive all compressor and all components within the unit required to cool compressed air, the motor and to remove heat from the compression section. The control section houses all the control means for operating the compressor unit.