I chose the Filtrete MPR 1000 as the best compromise between good airflow and clean air. Old-fashioned fiberglass filters, for example, have a hard time protecting the system from bugs and hair. But a filter that is too thick will strain and even damage your air conditioner/stove fan. A good pleated paper filter like the MPR 1000 offers a reasonable balance of removing dirt from the air and maximizing airflow. They delivered four Filtrete MPR 1000 filters in two days in two thick boxes. This eliminated my main problem - fragile cardboard frames could break during shipping. A four-pack lasts a year, so I'm good to go. The price is cheaper than my grocery store (even if they do stock!), so the Filtrete MPR 1000 deserves a solid five stars.
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