21 1/2x24x1 Exact MERV 7 AC Furnace Filters 6 Pack Electrical Components it provides a higher level
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21 1 2x24x1 Exact MERV 7 AC Furnace Filters 6 Pack Electrical Components it provides a higher level it provides a higher level of drainage and air filled pore space than 25% perlite rendering the insect unable to communicate with itself