Best Small Square Window Fan

Xpelair C4HTSR 4" Simply Silent Contour bathroom extractor fan with humidistat and timer, plus choice of square and round baffles, White, 240V

Xpelair C4HTS 4-inch Simply Silent Contour Extractor Fan Humidistat

Caravan Roof Vent Fan, RV Air Vent Ventilation with Rain Sensor, Automatic Level Permanent Reversible Fan 12V for RV Motorhome (14" Remote control)

CubeTech CTQF100t Smart LED 4" Inch Bathroom Extractor Fan with Timer Overrun Delay. Stainless Steel High Airflow Silent Bathroom Fan | Toilet Ventilation | Kitchen Ceiling Extractor | Fan Shower 240v

SEEKR Sirocco II, 7010CABBX, 3-Speed, 360 Degree Airflow, Direct Wire Gimbal Fan, 125/185 CFM, 12/24V, Black, 17.8cm Blade

Xpelair DX100BTS Simply Silent Bathroom Extractor Fan with Timer, Adjustable Twin Speed, Ghost Air Movement Technology for Quiet Running, 100mm (4″), Square – Cool White

BLU12 12,000BTU Portable Air Conditioner, Heating, Cooling, Dehumidification and Fan, Remote Control, Window Sheet for UK Windows Included, for Rooms Up to 30 Square Metres

Kair Smart 100mm Intelligent Extractor Fan with Humidistat Timer and Data Logger (Smart Fan Plus)

Vent Systems 250 x 250 mm / 10'' x 10'' Inch White Soffit Vent Cover - Flat Square Air Vent Louver - Grille Cover - Built-in Insect Screen - HVAC Vents for Bathroom, Home Office, Kitchen

Xpelair LV100T Low Voltage Bathroom / Toilet Extractor Fan with Timer for Window or Wall