The beeping noise is a warning and a reminder to change and order your new filter/filters.
The filter is 100% disposable and will continue to beep until you order your new Breathe Easy filter, replace it and dispose of old filter.
DO NOT run your airconditioning system without a filter as this will lead to system damage!
If your filter is not fully replaced it will also encourage the growth of pollutants, virus carriers and in the long term system damage!