Whole-House Fan Power Requirements at a Glance#
A whole-house fan is a gentle 120-volt load on a 5-15R outlet. The belt-drive style draws 3 to 6 amps for 360 to 720 watts on a 15 to 20-amp branch, while a direct-drive ceiling shutter model pulls 2 to 5 amps and 240 to 600 watts on a 15-amp circuit.
Whole-House Fan Electrical Specifications#
| Configuration | Voltage | Amps | Watts (max load) | Breaker | Outlet (NEMA) |
|---|---|---|---|---|---|
| Belt-drive whole-house fan | 120 V | 3–6 A | 360–720 W | 15–20 A | 5-15R |
| Direct-drive ceiling shutter fan | 120 V | 2–5 A | 240–600 W | 15 A | 5-15R |
A big ceiling fan drops into the attic floor and pulls the whole house full of cool evening air in minutes, running a fair-sized motor for an hour or two at a stretch. It wires to a wall switch or timer on a light branch of its own, and the larger belt-driven models move enough air to justify their own breaker rather than sharing with the bedroom lights.
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Circuit and Breaker Sizing for the Whole-House Fan#
For all the air it sweeps through the house, the motor itself asks for only a few amps, so 14-gauge wire on a 15-amp branch turns it with ease. A bigger belt-drive unit near the top of its range moves so much air — and runs so long on a warm evening — that a 20-amp branch of its own beats sharing with the bedroom lights. The trim direct-drive shutter version is lighter yet and rides a general circuit untroubled.
Installation and Safety Notes for Whole-House Fan Wiring#
Control comes from a wall switch or timer rather than a plug, with the motor dropped into a framed cut in the attic floor. Sawing that opening between joists and pulling the switch leg is most of the labor, and any new circuit is inspected work. A capable owner can sometimes seat a direct-drive shutter model in an existing opening, but framing the hole and wiring a belt-drive unit with its switch is better handed to a licensed electrician.
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Whole-House Fan Electrical FAQ#
What breaker does a whole-house fan need?#
The belt-drive style takes a 15 to 20-amp branch and a direct-drive shutter model a 15-amp one. A few amps of draw slot into either.
Is the fan switched at the wall or hardwired?#
It runs off a wall switch or timer instead of a plug, its motor seated in a framed opening cut into the attic floor.
How much current does a belt-drive model pull?#
A belt-drive whole-house fan draws 3 to 6 amps for 360 to 720 watts — more than the compact shutter version, yet still a light load.
Does a big ceiling fan deserve its own circuit?#
A larger belt-drive unit running for hours on a summer night is best on a 20-amp branch of its own. A small shutter fan can ride a shared circuit.
Can it share a branch with the upstairs lights?#
A compact direct-drive model can, drawing just 2 to 5 amps. A heftier belt-drive unit is happier on a branch to itself.
How does a direct-drive unit differ in draw?#
The direct-drive ceiling shutter fan pulls a touch less — 2 to 5 amps against the belt-drive's 3 to 6 — and runs on a 15-amp branch.
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