Models CM1000 CM1400 CM3000 Capacity, Lbs: Non-Porous Loads 500 650 1000 Porous Loads* Consult with plant Consult with plant Consult with plant Tube Size (2) 7″ (2) 7″ (3) 7″ Vacuum, in. Hg. 16-18″ 18-20″ 18-20″