The FG MACH I & IIA welds BDEP, CTC, SSP, CP & FTC type fasteners. The FG MACH I can weld to ductwork up to 20 gauge. It requires 220v, 50 to 60hz; service fused for 30 amps. The FG MACH IIA can weld to ductwork up to 18 gauge. It requires 220v, 50 to 60hz service, fused for 100 amps. A source of 85 psi air is required for both. Footswitch actuated, fasteners are inserted through the insulation and welded in place.RH MACH IIA welds BDEP, CTC, SSP, CP & FTC type fasteners to ductwork up to 18 gauge. It requires 220v, 50 to 60hz service, fused for 100 amps. A source of 85 psi air is required. Position a fastener over the insulation and depress the trigger switch. The machine inserts the fastener through the insulation and welds it to the steel.