Having assembled the fan and set it up, we measure the speed of the airflow through the fan at a distance of 1m with an anemometer, being sure to test at both maximum and minimum speed settings, plus a medium setting. Featuring three modes, each of which has three speeds, it’s a highly effective cooling unit that’s suitable for bedroom or living room use.

Whether this actually works or not is somewhat controversial, but the Ion Fresh does a nice job of making stuffy rooms more liveable and – more importantly – proves to be an effective fan.Although the exterior is a little plastic-looking, it’s one of the least-obtrusive fans we tested, and we barely noticed it once it was installed in the corner of our living room. While it can stand on a solid base, we especially loved the fact it can clip on to the side of a desk to use even less space, making it a summer office essential in our book. The latter is a colourless gas used in building materials and household products, such as paint and furniture, and the Dyson purifier detects molecules 500 times smaller than 0. Oscillating: Instead of focusing the air in a single direction, oscillating fans sweep the airflow across the room. In tests, we found it less effective as an air purifier than some dedicated models, but if you want to keep an average-sized living room or bedroom free of pollen and other airborne contaminants, it will do the job.

Unlike most pedestal fans, it can oscillate on both the horizontal and vertical axes, giving it more scope to push air around the room. Dyson’s ingenious hot and cool fan heaters exemplify this versatility, offering precise, room-filling air temperature that’s powered by intelligent Air Multiplier technology. Our extensive selection of fans covers all your cooling needs and even includes duel purpose fans that offer powerful room heating in the winter as well as a pleasant flow of cool air in the summer.

Bladeless fan: Available as freestanding or desk varieties, these new-age fans work with an electric motor that pulls air in through small vents in the base, then forces it upwards and out at high speeds through the circular ring above. With an eight hour timer that can be adjusted by one hour increments, this clever fan is perfect for summer nights. By passing all the air it draws in through the large “activated carbon” and HEPA filters in the base of the fan, it can remove all sorts of domestic pollution from the air as it cools, from allergens such as pollen to volatile organic compounds (VOCs) and NO2. If the item comes direct from a manufacturer, it may be delivered in non-retail packaging, such as a plain or unprinted box or plastic bag.