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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
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The Lennox Y2921 accepts the following air filter replacements:
The Lennox HCC16-28 Filter Cabinet System MERV 16 is an air cleaner cabinet that attaches directly to your HVAC system without causing any additional energy costs. The Lennox Healthy Climate HCC16-28 is ideal for whole-house air filtration. The Lennox X6672 MERV 16 filter and the Lennox X6670 MERV 10 filter are suitable cartridge replacements that will slide easily into the Lennox filter cabinet to provide hospital grade air filtration for your home.
Lennox HCC16-28 Filter Cabinet System MERV 16 specifications: