Easy access panel allows for quick and easy product maintenance and filter checks. Intelli-Balance 100 has two filters that clean the exhaust and supply air before passing through the ERV core, extending the life of the core. Intelli-Balance 100 comes equipped with a MERV 8 filter that can easily be upgraded to a MERV 13. Convenient light and sound indicators signal when it's time to clean the filters using the soft brush attachment of a vacuum. The supply air filter should be inspected every 90 days and replaced every 6 months to maintain the ERV's peak performance.