AlpinePure MERV 11 filters are available in both 2-inch (211) and 4-inch (411) sizes. MERV (Minimum Efficiency Reporting Value) is an industry standard which rates the ability of a filter to trap particles 0.3 to 10.0 microns from the air we breathe. Most ordinary, inexpensive filters found at hardware stores are MERV 4 or lower—they are simply ineffective in capturing smaller particles. In addition, AlpinePure 211 and 411 filters are pleated to increase the surface area allowing for more holding capacity and less frequent replacement.
All geothermal heat pumps.
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