Are you being charged obscene amounts for technology invented in the 1940s?
Doing your research will help you make an informed decision on what you are actually paying for in an air purifier. We have summarised some premium features here with links to external sites so do come back to this page to finish reading. HEPA filters have different grades (eg 99.5, 99.95, 99.995 etc) but know that the more particles it catches, the lower the airflow. The H11 filter was chosen for The Sqair™ over the H12 as tests showed it gave 27% more clean air at first pas