Agree on dust removal. But if you have a constant source of pollutant input such as air pollution, dust or pollen, you want to be running a filter 24/7. Large

Agree on dust removal. But if you have a constant source of pollutant input such as air pollution, dust or pollen, you want to be running a filter 24/7. Large buildings don't run their HVACs in burst and then turn them off.