ft. I use this with a Nest thermostat that tells me when to change the filter. I will if he tells me to. Nevertheless, the filter still needs to be cleaned a little. I use a small brush and a regular sized brush to hand clean it before wetting and spraying. If you spray it first, it will be very difficult for you to get the dust off it. After brushing it (about an hour inspection and cleaning) the rest was just spraying it with water, drying it and spraying it with K&N solution. For the cost of merv 11 filters, you'll have to judge for yourself if it's worth it for you or if it's worth replacing or cleaning. These filters ensure good airflow.
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