Compare
Portable vacuum pump CFM classes compared
3.5, 5, and 7 CFM portable vacuum pump classes with example VEVOR listings and NO_MATCH ceiling.
| Class | Best for | Trade-off |
|---|---|---|
| 3.5 CFM single-stage | Mini-splits and small residential systems up to ~3.5 ton required CFM | Single-stage — slower deep vacuum vs 2-stage on long line sets |
| 5 CFM two-stage | Typical 3–5 ton residential central systems | Mid-range portable — not a commercial dual-pump rig |
| 7 CFM two-stage | Large residential and light commercial up to ~7 ton required CFM | Top consumer portable rung on this site |
| Above 7 CFM required | Large commercial chillers, long line sets, dual-pump setups | NO_MATCH on this site — need a higher-CFM commercial class |