Furnace Filters
MERV ratings are determined by adding particles of varying sizes (1-12) into a controlled testing environment. The particles are added upstream of the test filter and a laser particle counter samples the air before it enters the furnace filter and after it leaves the furnace filter. The two particle counts are compared to calculate the Particle Size Efficiency of the tested furnace filter. Once this is determined, a MERV Parameters chart is used to determine the MERV rating. Clean air filters are as essential on your furnace as they are on your car. They can filter out pollen and dust and need to be cleaned or replaced as recommended by the furnace manufacturer. Filters should be checked monthly during the heating season and the cooling season if you have air conditioning.
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