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3M Filtrete Allergen Defense Protection 1000 Micro Allergen Filter

Install Filter: 1. Remove plastic packaging and paper insert from filter, leaving cardboard frame Intact. 2. Insert filter Into the designated opening in your furnace or air conditioning system or wall/ceiling return with the arrow on the frame pointing toward the unit's blower motor (this Is generally in the largest part of your HVAC unit). 3. For proper performance, change your air filter every three months.