Kaiv310 - 900 cfm [free air cfm rating Kaiv320 - 1400 cfm [free air cfm rating Kaiv322 - 2720 cfm [free air cfm rating Kaiv340 - 3820 cfm [free air cfm rating Kaiv3702 - 5450 cfm [free air cfm rating 28" hg maximum vacuum Air injection cooling Low pulsation tri-lobe impeller design Large oil sumps for increased bearing lubrication Robust reinforced main housing - quiet operations Kaiv320= wooden box packing, lot size: 4 nos, dimension: 45"x41"x25", gross weight: 600 kgs