18x20x1 (17_3/4x19_3/4) Nordic Pure Tru Mini Pleat MERV 10 Air Filters 12 Pack
There is an airflow direction arrow on the side edge of your Nordic Pure pleated air filter. For air filters with carbon added the carbon is on the air exit side. The extra pleats ensure maximum efficiency without restricting airflow, saving you money on HVAC maintenance and extending the life of your filter.
12x20x1 (11_1/2x19_1/2) Nordic Pure Tru Mini Pleat MERV 10 Air Filters 3 Pack
There is an airflow direction arrow on the side edge of your Nordic Pure pleated air filter. For air filters with carbon added the carbon is on the air exit side. The extra pleats ensure maximum efficiency without restricting airflow, saving you money on HVAC maintenance and extending the life of your filter.