Airwatt

An airwatt (also known as a nozzle watt) is a unit of measurement for the effectiveness of vacuum cleaners. It represents the actual cleaning power of a vacuum cleaner, taking into account both the airflow rate and the suction. Unlike wattage, which only indicates the electrical power consumed by the motor, the airwatt measures the power of the airflow that removes dirt.

Airwatts are calculated using a formula that considers the airflow, usually measured in cubic feet per minute (CFM) or liters per second (L/s), and the water lift (suction), usually measured in inches of water or kilopascals (kPa). The precise formula may vary slightly depending on the source, but generally involves multiplying airflow by suction pressure and dividing by a constant to arrive at a value in watts.

Higher airwatt values generally indicate a more powerful and effective vacuum cleaner. However, airwatt is not the only factor determining cleaning performance; other factors such as brush design, filtration system, and overall vacuum cleaner construction also play significant roles.

It's important to note that comparing airwatt values between different vacuum cleaner brands can be difficult, as testing methods may vary. Therefore, it's advisable to consider airwatt ratings alongside other product features and user reviews when making a purchasing decision.