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Clean Comfort MERV 11 Pleated Air Filter 16X25X4.5 (5pk) Bathroom Built for dependableThis is a package of 5 filters. These filters function at MERV 11 and are ~4. 5 in thick. Most filters labeled 4. 5 in thick are actually ~4. 375 in thick, this is normal. For this thickness of filter we recommend changing your filter every 6 9 months for maximum air flow, best filtration, and least wear and tear on your system. Something to note is that human lungs filter air at approximately MERV 8 equivilant. Using filters above MERV 8 helps to
