[aubreykilian]

This smells like a marketing gimmick... (See what I did there?) Why not just make that button's functionality be the default, instead of an optional setting? I think some engineer had way too much fun putting that hazardous image into the UI...

[ghshephard]

If I had to guess - with air being forced through a full filter, you are going to take a serious hit to range as a lot of power is required to force the air through the filter at full "filtering" setting.