Peerless HQD20VS HQ-Air 20HP Variable Speed Rotary Screw Compressor Basemount – 8 Bar – 2200LPM 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 2200LPM, it will slow down to the air required without any air fluctuation between load and unload pressures keeping a constant pressure (1bar = 5% energy).