Humidstat fans have a sensor in them. When a set humidity point is reached the fan will switch on.
eBay
DC 1.8V-15V 2A 30W PWM Motor Speed Controller Regulator Low Voltage Fan Speed Control Switch PWM Adjustable Drive 5V 12V
Aliexpress UK
Using only 5% of the water content of an equivalent output radiator the Ecovector high level fan convector is more energy efficient, more responsive and more effective than either under-floor heating or panel radiators.
eBay
Low Voltage 600W 800W MPPT Wind Turbine Charge Controller With LED Display Auto 12V 24V Windmill Fan Regulator IP65 Waterproof
Aliexpress UK
Manrose 12V low voltage, 100mm extractor fan, part number XF100LV. This fan should not be connected to 240V directly but installed with a Manrose type T12/LT12 range of 12V transformer.
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2024 New Bladeless Fan Electric Cooling Air Tower Fans With Remote Control Intelligent Low Noise 16 Inch Stand Floor
Aliexpress UK
Wall or ceiling mounting Quiet and efficient 20W and 41 dB[A] 23 litres per second [85m³/ hour] Single phase induction motor Requires transformer sold separately [RT12SN - standard / RT12PN - pullcord / RT12TN - timer / RT12HN - humidistat / RT12HPN - humidistat pullcord] SELV [safety extra low voltage]
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Cute USB Mini Fan Portable Handheld Fan Rechargeable Mini Handy Fan Pocket Size Low Noise Small Electric Fan Student Dormitory
Aliexpress UK
The Manrose 12 Volt SELV Fan Range is ideal for bathrooms and is designed for wall, ceiling or window mounting. The units are all manufactured using high impact ABS thermoplastics for strength and durability, aesthetics and easy cleaning. Extracts up to 85m^3 per hour / 23 Litres per second.
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4 Speed Pipe Exhaust Fan 100/150 mm Inline Duct Fan Extractor Low Noise Air Ventilator Bathroom Toilet Wall Fan Duct Fan 220V EU
Aliexpress UK
The Vent Axia 188210 "Luminaire T" Extractor Fan/Light is a high-quality, energy-efficient solution for improving ventilation in kitchen and bathroom spaces. This circular mixed flow fan features a glossy white finish and can be mounted on the wall or ceiling. With a timer switch for added convenience, this extractor fan also boasts an overrun timer feature and is designed with a timer control style. Manufactured in the United Kingdom, this electric fan is a reliable and efficient choice for maintaining a healthy indoor environment.
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Handheld Fan Panda USB Rechargeable Portable Mini Fan Cartoon Electric Fan With Soft Blades Low-Noise Personal Pocket Fans
Aliexpress UK
Envirovent INF-DL-SELV-BDS - 12V Filterless WC Bathroom Extractor Fan (DL - DATALOGGER). Fan, Filterless Infinity Extract SELV, Datalogger/Addl Trickle Speeds. With BDS (back draft shutter). Low maintenance.
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Belt Clip Fan Low Noise Portable Rechargeable Fan Personal Portable Fan Adjustable Hands-Free Rechargeable Belt Fan Wearable
Aliexpress UK
▶Quiet, low noise, energy efficient classic bathroom exhaust fan suitable for any modern, contemporary bathroom or anywhere a classic look is desired - this fan is used in bathrooms, toilets, storage rooms to remove humid air from the room, these devices can also be used in Bedroom and kitchen.
eBay
8 Inch Air Cooling Fan 12V/24V 15W Electric Car Oscillating Fan Low Noise Summer Cooling Fan Rotation Adjustable Clip-On Car Fan
Aliexpress UK