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The Lennox 91X23 is a furnace air filter that reduces the following allergens from your indoor air:
The Lennox 91X23 MERV 8 Pleated Air Filters 4-Pack are pleated air filters made with moisture-resistant beverage board frame and sturdy support grid. These healthy climate furnace filters should be changed every 90 days.
The Lennox 91X23 specifications: