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• 20x25x5 (19.63x24.38x4.75) MERV 8 Armstrong Replacement Filter
  
  
• 20x25x5 (19.63x24.38x4.75) MERV 11 Armstrong Replacement Filter
  
  
• 20x25x5 (19.63x24.38x4.75) MERV 13 Armstrong High Efficiency Replacement Filter
  
  
• 20x25x5 (19.63x24.38x4.75) Carbon Armstrong Replacement Filter
  
  

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