Usha Crisp Air Premia CV Exhaust Fan (White) The Crisp Air Premia exhaust fan by Usha effectively controls the quality of air in an enclosed kitchen space or bathroom by getting rid of moisture, smoke, fumes and bad odour. The automatic back shutter operation and strong, rust-proof body makes this window ventilating fan the very best in its category and ensures that you don’t have to worry about changing it for a long time. The chic white color of this Usha exhaust fan lends it an elegant appeal. Sweep size mentioned in product title is the dimension (diameter) of the blade. It should not be the sole criterion for you to make a purchase decision. Before buying an exhaust fan, it is important to consider a few other factors such as the dimensions of the duct (length, width), available space around the duct from the ceiling or side walls, whether installation is done on glass or concrete wall, etc. Accurate knowledge of the duct dimensions will help you make precise comparisons with the dimensions provided in the image. This will best serve your purpose and make your purchase seamless.