MERV 11
pleated
Lennox Model X6667 MERV 11 Replacement Filter - 21 x 26 x 4
Factory original filter from Lennox. This Healthy Climate MERV 11 filter fits the PureAir air purification system. The X6667 cartridge can last up to 6 months, though product replacement life cycle depends on the individual conditions and needs of your home.
Nominal size
21x26x4"
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Replaces these filters
This filter is a direct replacement for the following manufacturer part numbers.
Lennox
75X67
National Filter Sales
21x26x4
Other 21x26x4 filtration levels
Specs and performance data are the manufacturer's published test results. Always confirm the size printed on your current filter's frame before ordering.
Lennox Model X6667 MERV 11 Replacement Filter - 21 x 26 x 4
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