The HENRY Company

But a lot of them DO lose airflow, which is what moves the dirt from your carpet to the dirt receptacle. When filters get coated & saturated with fine dust, the vacuum WILL clog, no matter what some blokes might tell you. Bagless ones are the worst for this (especially if you don't clean the filters after EACH USE as the instructions tell you), as we un-clog hundreds of them a year - even Dysons (they sure do look cool, though).