HEPA Filters can last a long time (up to 5 years) but it's crucial for the pre-filter to be maintained or replaced. This pre-filter protects the HEPA from larger particulates and allows it to filter smaller particles more effectively. These foam pre-filters can be washed several times before needing to be replaced. Every air quality situation is different, so check your filters regularly to determine if they need cleaning or replacement.
The carbon blankets can be stored in a zip-loc bag if not needed for a period of time.
This annual kit includes:
(1) Foam Pre-filter
(2) Carbon Blankets