People always look for a vacuum cleaner that is powerful with reasonable price. But how we measure the vacuum power? This article will let you know some of the terminology and specifications.
The performance of a vacuum cleaner can be measured by several parameters:
- airflow, in cubic feet per minute (CFM or ft³/min) or litres per second (l/s)
- air speed, in miles per hour (mph) or metres per second (m/s)
- suction power, or water lift, in inches of water or pascals (Pa)
The suction of a cleaner is the highest pressure difference that the pump can create. For example, a typical upright vac has a suction of about negative 20 kPa. That means it can lower the pressure inside the hose from normal atmospheric pressure (about 100 kPa) by 20 kPa. The higher the suction power, the more powerful the vac cleaner and user are tend to love those vacuum as it’s easier to clean.
The power consumption of a vacuum cleaner, generally in watts, is often the only figure stated. Some USA as well as overseas vacuum manufacturers only give the current in amperes (e.g. "13 amps") and the consumer is left to multiply that by the line voltage of 120 volts to get the power ratings in volt amperes (not quite the same as watts for AC current, see AC voltages).
The power does not indicate the effectiveness of the cleaner; only how much electricity it consumes. The amount of this power that is converted into airflow at the end of the cleaning hose is sometimes stated, and is measured in air watts: the units are simply watts; "air" is used to clarify that this is output power, not input electrical power. This is calculated using the formula:
Cleaning power (air watts) = airflow (CFM) × suction (inches of water) / 8.5
= airflow (m³/s) × suction (Pa)
Air watts measured at the vacuum's motor can differ by as much as 50% (depending on the type of vacuum) from the air watts measured at the end of the hose. This is most noted in Central Vacuums.
Some smaller vacuum cleaners are lightweight, portable, and using rechargeable battery, instead of using AC power.
For more information on how to choose a reliable vacuum as well as reviews on different types of vac cleaners, visit here.