Mini Pleat Standard Wind Sub HEPA Filter (without Clapboard) ULPA Filter E11 99.5% at 0.3micon - China ULPA Filter, Air Conditioner System | Made-in-China.com
Medify Air 16x25x4 Filter - MERV 11 - E11 Media - Air Cleaning (2-Pack) - Pleated HVAC AC Furnace Air Filters Replacement - Actual Size: 15.67 x 24.6 x 4.29 Inches (MERV 11, 2-Pack) - Amazon.com
Medify Air 16x25x4 Filter - MERV 11 - E11 Media - Air Cleaning (2-Pack) - Pleated HVAC AC Furnace Air Filters Replacement - Actual Size: 15.67 x 24.6 x 4.29 Inches (MERV 11, 2-Pack) - Amazon.com
E10/E11/E12/H13/H14 Deep Pleated HEPA Air Filter with Separator/Clapboard for Clean Room - China HEPA Filter, H13 Separator Filter | Made-in-China.com