MERV 13 outperforms MERV 11 in filtration efficiency, removing 90% of 1‑3 µm particles versus 65% (Consumer Reports), which is crucial for allergy sufferers. However, the higher pressure drop can modestly increase fan load, and the price premium is modest (Home Depot pricing). For most households without specific health concerns, MERV 11 offers adequate protection at lower cost and energy impact.
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