Selecting the Right Size Pump

The more air a vacuum pump moves, the faster it can reach an acceptable vacuum.  Air movement is measured in cfm, and the size of the system determines the size of vacuum pump needed to efficiently remove air and moisture.  A vacuum pump with weak air movement ability, or low cfm rating, takes more time to evacuate than a vacuum pump properly sized for the system.

Use this chart as a guide:

System

Recommended Pump Size

Up to 10 tons
Passenger Car
Domestic refrigeration

1.2 cfm

Up to 30 tons
Panel trucks, RVs
Residential A/C

4 cfm

Up to 50 tons
Tractor/trailers, buses
Rooftop A/C systems

6cfm

Up to 70 tons

10 cfm