Quote:
Originally Posted by retiredguy123
The Merv 11 filters collect a little more dirt than the standard Merv 8, but I have found them to make the house less dusty and more quiet, and they don't seem to adversely affect the fan speed. But, I would not trust any filter for 12 months. FilterBuy is a good brand to buy on Amazon.
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Might have no affect fan speed but may affect cubic feet per minute At ducts. Especially the duct that travels furthest? Why I check flow at ducts with Anemometer.