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The Lennox X4913 includes three filters than can be replaced by the following air filter system kit:
The Lennox X4913 HEPA 40 Air Filtration System is a HEPA air filter system that removes nearly all allergy-inducing contaminants from you air, including small particles and bacteria. This HEPA 40 system also filters and freshens the air throughout your home, allowing you to breathe easier. A high-efficiency particulate air (HEPA) bypass filtration system is designed to trap the smallest of particles and prevent them from recirculating in your air.
The Lennox Healthy Climate HEPA 40 Bypass Filtration Unit offers the best possible air filtration performance and has been tested to meet industry standards for particulate reduction in the air. This air filtration system includes a pre-filter, HEPA filter, and a carbon filter that will improve your indoor air quality.
Lennox X4913 HEPA 40 Air Filtration System specifications: