FOR OPTIMAL PERFORMANCE of your heating & cooling system or HVAC system, change your home air filter at least every 90 days for 1 inch filters, and at least every 12 months for 4 inch and 5 inch filters A dirty filter will slow down air flow and make the system work harder to keep you warm or cool--wasting energy; Sign-up for a filter change reminder program that works for you! International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.
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