Review on 🌀 Whirlwind Life Battery Operated Fan - Dual-Use, Portable and Efficient - Camping, Patio, Outdoor Activities - 15600mAh Capacity Battery for 5-24 Hours Runtime - Includes USB Output for Phone Charging by April Malone

I used this fan to circulate warm air in my house as my forced ventilation unit is currently broken. It was a lifesaver, especially after 15 inches of snow and cold outside temperatures. In my area, the power usually goes out during this type of storm, so I needed a fan to keep the house warm. The battery exceeded my expectations for runtime at high speed (8 hours). I'm currently testing it on lower settings (10 out of 12) to see how long the battery lasts. I don't notice a huge difference in the amount of air, but I'll see if the battery lasts longer. I will edit my review if there are any issues later (no edit = no issue) but until then I highly recommend this fan.