Fast shipping: Delivery within 5-14 business days. 
30-Day Return & Refund, 2-Year Limited Warranty. - Air Filter: MERV-13 air filter for ACF4/ACF6 filter box, which minimizes the amount of air bypassing the filter. Actual Size: 12.08″ x 20.15″ x 0.78″.
- High Efficiency Filteration: MERV 13 air filters can effectively trap particles sized 0.3 to 1 and help filter out smoke, pollen, particulate matter in air and help reduce offensive odors without reducing air flow.
- Improve Indoor Air Quality: Efficient HVAC filters provide cleaner, and fresher air for all inhabitants.
- Easy & Simply to Use: Just open up your vent and remove the used filter, make sure the airflow arrows are pointing toward your HVAC unit, then put new filter in designated location.
- Regular Replacement: It is recommended to change your filters every 6 months for maximum efficiency. This depends on the air quality of the space in which the filter is used.
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