The best central vacuums have almost the same CFM (cubic feet per minute of airflow) as suction (normally measured in inches of waterlift). Many central vacuums have high suction but have very low CFM or high CFM and low suction.[inset side=”right” title=”American homes today”] Most homes today have a combination of surfaces and having a motor unit with both powerful suction and high airflow is a necessity.[/inset]Airflow is important particularly in carpet cleaning. You want to move the greatest amount of air through the carpet fibers. For vacuuming hardfloors, suction or lifting the dirt up off the floor is most important. Don’t be fooled by the term Airwatts (a mathematical formula that even includes the amount of electricity used) or a square footage figure that is supposed to tell you the minimum amount of power needed to clean. Have you ever bought any vacuum for the minimum amount of power to clean? I rather doubt it.