Air Science ASTM-PRF

<p><strong>Air Science, ASTM-PRF, Pre-Filter 6-Pack </strong> </p> <p>Replacement Door and Main Pre-filters. (Change every 2-3 months) </p> <table class="dataTable" border="0" width="100%" cellspacing="1" cellpadding="2"><tr><td>Unit of Measure </td> <td>Pack of 6 pcs </td> </tr> </table>