Using your K&N HVAC filter is easy. First, make sure your HVAC system is turned off. Remove the old filter and place the K&N filter in its spot, following the airflow direction indicated on the filter. When it comes to maintenance, check the filter regularly, especially during high - usage seasons. Once it looks dirty, remove it from the HVAC system. Gently wash the filter with lukewarm water and a mild detergent. Rinse thoroughly to remove all soap. Let it dry completely before reinstalling it. Remember, don't use harsh chemicals or abrasive materials as they can damage the filter. Keep using this filter, and it will serve you well for the life of your HVAC unit.