The BOSS SG4040 is the all-in-one mobile power and air solution spray foam insulation contractors have been waiting for. Combining a 40kW generator with a 40 CFM rotary screw air compressor on one rugged skid, the SG4040 powers spray polyurethane foam rigs, slab lifting equipment, and polyurea coating operations on commercial and residential job sites. Less downtime. More consistent output. The mobile compressor and generator system that keeps spray foam crews productive from first spray to last.