Thank you for your time and information. I am USING your information on an entirely separate project from vacuum cleaners but your existing experiments are helpful in my understanding of vacuum and cfm and other things I can use. Thanks again...
For us it is a shame that so few manufacturers provide airwatt figures as a guide to performance of their machines. Airwatts handily combine sealed suction and airflow performance into one figure taking into account the associated pipes, bags and filters where fitted. Though healthy airwatt numbers are not the be all and end all of cleaning ability they are often a guide to how well an air system is designed. Factors such as agitation are ignored by airwatts but obviously have a huge impact on performance too.
