The SL series low-pressure screw compressor uses airends specially designed for low-pressure applications. The rotor clearance and the housing of the airend are precisely designed with the exhaust source altered, the bearing pedestal enlarged, and all the airends adjusted to meet the requirements for large air delivery and low pressure. The unit outputs the pressure that is needed directly and avoids energy loss from over-compression, re-expansion, and leakage, thus saving over 25% of energy usage. The entire system runs under low-pressure, which lowers the amount of stress and heat load that is placed on the parts. This enables compressor operation that is more stable with a longer service life.