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Most “too small” compressors fail on CFM, not tank size — the tank covers short bursts, but continuous tools need continuous air. Tick the tools you run to see the compressor CFM and tank size that keeps up with them.
Typical air tool CFM at 90 PSI
| Tool | Typical CFM | Duty |
|---|---|---|
| Brad / finish nailer | 0.5–1 | Intermittent — small compressor fine |
| Framing nailer | 2–3 | Intermittent |
| Impact wrench (½ in) | 4–6 | Short bursts |
| Ratchet wrench | 3–4 | Intermittent |
| HVLP spray gun | 6–10 | Continuous — needs real CFM |
| DA sander / grinder | 6–9 | Continuous — biggest common load |
| Die grinder | 4–6 | Continuous |
| Blow gun | 2–4 | Intermittent |
Size the compressor to about 1.5× the CFM of the hungriest tool you run continuously; intermittent tools can share a smaller unit.
FAQ
Does a bigger tank make up for low CFM?
Only for short bursts like nailing or lug nuts. For sanding or spraying, the tank drains in minutes and you wait on the pump — CFM is what matters.
What size compressor for a home garage?
A 20–30 gallon unit delivering 5–7 CFM at 90 PSI covers nailers, inflation and impact work. Add spray or sanding and look at 60 gallons and 10+ CFM.
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