How Many Amps Does a Box Fan Use?
Box Fan draws about 0.6 amps at 120 volts (75 watts running) and briefly spikes to around 0.8 amps at startup. At 0.6 A, a box fan fits comfortably on a standard 15 A or 20 A household circuit.
Amps = watts ÷ volts. Enter the wattage from your appliance's nameplate or label for an exact figure.
Current draw — a box fan
0.6 A
- At 120 V
- 75 W
- Typical breaker
- 15 A
Breaker figure is guidance for a simple resistive load, sized at 125% for continuous running — confirm against the nameplate and a licensed electrician.
Box Fan amperage at 120 V and 240 V
Same 75 W load — the current halves when the voltage doubles. Box Fan is typically a 120 V appliance in US homes.
| Draw | Watts | Amps at 120 V | Amps at 240 V |
|---|---|---|---|
| Running | 75 W | 0.6 A | 0.3 A |
| Starting (surge) | 100 W | 0.8 A | 0.4 A |
The startup surge lasts a fraction of a second — it matters for generator sizing and breaker trip curves, not for your electric bill.
Breaker and circuit for a box fan
At 0.6 A, a box fan fits comfortably on a standard 15 A or 20 A household circuit. For a dedicated circuit, guidance is a 15 A breaker with 14 AWG copper (75°C terminations) — sized at 125% of the running current because it runs 3+ hours at a time (NEC 210.20).
Guidance only — actual circuit sizing depends on your unit's nameplate, wire run length, and local code. Confirm with a licensed electrician. See the wire & breaker size chart for the full NEC ampacity table.
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