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Koch Filter 102 081 009 MULTI PLEAT XL11 HC 1" High Capacity Semi Standard MERV 11 Pleated Panel Filter Size 18x18x1 8321 Testing and Approvals:TAA Compliant Protective Testing and Approvals:TAA Compliant Protective Apparel PN: 4056529 The Multi Pleat XL11 carries a MERV 11 fractional efficiency rating in accordance with ASHRAE Test Standard 52 The Koch Multi Pleat XL11 is a medium efficiency extended surface pleated panel filter
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