Lennox X4138 OEM Carbon Pre-Filter Fits Models HEPA-40, HEPA-60 by Len - Atomic Filters
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DLXX4138

Lennox X4138 OEM Carbon Pre-Filter Fits Models HEPA-40, HEPA-60 by Lennox

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Lennox X4138 OEM Carbon Pre-Filter Fits Models HEPA-40, HEPA-60 by Lennox

Three-Stage Filtration Process:
- Stage 1: Pre-filter - an inexpensive pre-filter to remove larger particulates from the air. This is important to prolong the life of the HEPA filter. Rated MERV 6. Estimate life - 12 months.
- Stage 2: HEPA - removes 99.97% of particulates down to 0.3 micron. Estimate life 2-5 years.
- Stage 3: Carbon - 1/2 in. (13 mm) thick carbon filter for removing chemicals and odors from the air. Replace filter when it no longer seems to capture odors, or once every 3 months. 

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