Battery-powered bathroom fan: the offer doesn't keep up

Battery-powered bathroom fan: the solution that never quite exists

15 watts. That's what a 100mm axial bathroom fan consumes, the same as a low-energy light bulb. Yet the question of whether a battery-powered version exists to avoid calling an electrician remains unanswered. The problem isn't electricity: it's moisture in a bathroom without a window.

What options are there to ventilate a bathroom without a window?

The real alternatives are three: connect it to the mains, install a model with rechargeable batteries, or use a dehumidifier. The first is the most common and the most sensible. The 15-watt consumption of a 100mm axial fan, like Leroy Merlin's standard Equation, is equivalent to that of a light bulb: turning it on with the light is a negligible expense. Battery-powered models exist, but they tend to be low-power and can't always push moist air through a long duct. The dehumidifier, for its part, tackles condensation on cold surfaces, but doesn't replace forced ventilation.

The case of moisture you don't see coming

A home from the early 2000s, in a village, with a north-facing facade and top floor: the perfect scenario for shower steam to condense on the ceiling and windows. The repeated solution combines an extractor fan and a dehumidifier. Without extraction, moisture spreads throughout the house.

The initial question, about the battery-powered fan, isn't quite resolved. They exist, but are scarce and don't always deliver. The most practical option remains connecting the device to the mains or paying a little more for a dehumidifier. Waiting for the industry to come up with a decent battery? It might be quicker to roll up your sleeves.