Algas-SDI Gas-Air mixers are designed and manufactured for industrial and utility applications using the highest quality materials and components. Decades of experience and a focus on continuous improvement have led to the most reliable and durable mixers available today. World-wide applications include propane-air or LPG-air mixing for natural gas replacement, coal gas and coke oven gas replacement, and digester gas augmentation or replacement. Standard packages are set up for natural gas replacement using propane or LPG. Other gas mixtures can be accommodated with configuration options. Most models are available in compliance with European directives -- PED and ATEX marked where required. All standard models are FM approved.