Peerless HD40/10 HQ-Air 40HP Variable Speed Rotary Screw Compressor Basemount – 10 Bar – 4500LPM are here to save you money!  Stop buying machines that run continuously when you’re not using the air. This machine will perform to your requirements and save you money at the same time. Variable speed means if you’re using 8 bar, consuming 6 bar 800LPM and the compressor is designed to produce 4500LPM, it will slow down to the air required without any air fluctuation between load and unload pressures keeping a constant pressure (1bar = 5% energy).