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Koch Multi-Pleat™ Green 13 Panel Filter - 12" x 24" x 1" | The Green 13 is a sustainable component of green building development. By virtue of its MERV 13 performance rating, the Green 13 can earn points toward LEED certification in the US Green Building Council's Green Building Rating System. (LEED is Leadership in Energy and Environmental Design, an integral part of the rating system). While MERV 13 and 14 are recommended by the ASHRAE, it's best to select a filter with the highest MERV rating possible for your specific HVAC system. When it comes to home air purifiers, HEPA.
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